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n INTERNATIONAL BACCALAUREATE ORGANIZATION CHEMISTRY DATA BOOKLET March 2003 To be used in the teaching and examination of Diploma Programme chemistry Valid for examination sessions from May 2003 Chemistry Data Booklet First published August 2001 Reprinted with minor corrections March 2003 © International Baccalaureate Organization 2001 Organisation du Baccalauréat International Route des Morillons 15 Grand-Saconnex, Genève CH-1218 SWITZERLAND Notes This booklet cannot be used for paper 1 of the examination (HLP1 and SLP1), but the periodic table given on page 4 will be available as part of these examination papers. Clean copies of this booklet must be made available to candidates for papers 2 and 3 (HLP2, HLP3, SLP2 and SLP3). Contents 1. Some Relevant Equations 2 2. Physical Constants 2 3. Fundamental Particles 2 4. Names of the First 103 Elements 3 5. The Periodic Table 4 6. Melting Points and Boiling Points of the Elements 5 7. First Ionization Energy, Electron Affinity and Electronegativity of the Elements 6 8. Atomic and Ionic Radii of the Elements 7 9. Covalent Bond Lengths 8 10. Average Bond Enthalpies at 298 K 8 11. Organic Compounds—Thermodynamic Data 9 12. Ellingham Diagram 10 13. Enthalpies of Combustion 11 14. Lattice Enthalpies at 298 K (Experimental and Theoretical Values) 12 15. Standard Electrode Potentials 13 16. Strengths of Organic Acids and Bases 14 17. Acid–base Indicators 15 18. Infrared Data 16 19. 1 H NMR Data 17 20. 2-amino Acids 18 21. Structural Formulas of Some Important Medicines and Drugs 20 22. Structural Formulas of Some Important Biological Molecules 22 1. Some Relevant Equations E = hf E = mc 2 ∆G 0 = ∆H 0 − T ∆S 0 PV PV 1 1 = 2 2 T1 T2 t 1 2 = 0.693 k k = Ae log10 − Ea RT [ A] = [ A]o e− kt ln k = − or ln Io = ∈lc I Ea + ln A RT [ A]o [ A] = kt 2. Physical Constants Avogadro’s constant (L) = 6.02 × 1023 mol-1 Gas constant (R) = 8.31 J K-1 mol-1 Molar volume of an ideal gas at 273 K, 1.01 × 105 Pa = 2.24 × 10-2 m3 mol-1 (22.4 dm3 mol-1) Speed of light in a vacuum (c) = 3.00 × 108 m s-1 Planck constant (h) = 6.63 × 10-34 J s Specific heat capacity of water = 4.18 kJ kg-1 K-1 ( = 4.18 J g-1 K-1) Ionic product constant for water (Kw) = 1.00 × 10-14 mol2 dm-6 at 298 K (1 atm = 1.01 × 105 Pa) (1 dm3 = 1 litre = 1 × 10-3 m3 = 1 × 103 cm3) 3. Fundamental Particles Proton 2 Neutron Electron Mass/kg 1.672648 × 10-27 1.674954 × 10-27 9.109534 × 10-31 Charge/C 1.602189 × 10-19 0 1.602189 × 10-19 IB Diploma Programme: Chemistry Data Booklet, March 2003 4. Names of the First 103 Elements Element actinium aluminium americium antimony argon arsenic astatine barium berkelium beryllium bismuth boron bromine cadmium caesium calcium californium carbon cerium chlorine chromium cobalt copper curium dysprosium einsteinium erbium europium fermium fluorine francium gadolinium gallium germanium gold hafnium helium holmium hydrogen indium iodine iridium iron krypton lanthanum lawrencium lead lithium lutetium magnesium manganese mendelevium Symbol Atomic Number Element Symbol Atomic Number Ac Al Am Sb Ar As At Ba Bk Be Bi B Br Cd Cs Ca Cf C Ce Cl Cr Co Cu Cm Dy Es Er Eu Fm F Fr Gd Ga Ge Au Hf He Ho H In I Ir Fe Kr La Lr Pb Li Lu Mg Mn Md 89 13 95 51 18 33 85 56 97 4 83 5 35 48 55 20 98 6 58 17 24 27 29 96 66 99 68 63 100 9 87 64 31 32 79 72 2 67 1 49 53 77 26 36 57 103 82 3 71 12 25 101 mercury molybdenum neodymium neon neptunium nickel niobium nitrogen nobelium osmium oxygen palladium phosphorus platinum plutonium polonium potassium praseodymium promethium protactinium radium radon rhenium rhodium rubidium ruthenium samarium scandium selenium silicon silver sodium strontium sulfur tantalum technetium tellurium terbium thallium thorium thulium tin titanium tungsten uranium vanadium xenon ytterbium yttrium zinc zirconium Hg Mo Nd Ne Np Ni Nb N No Os O Pd P Pt Pu Po K Pr Pm Pa Ra Rn Re Rh Rb Ru Sm Sc Se Si Ag Na Sr S Ta Tc Te Tb Tl Th Tm Sn Ti W U V Xe Yb Y Zn Zr 80 42 60 10 93 28 41 7 102 76 8 46 15 78 94 84 19 59 61 91 88 86 75 45 37 44 62 21 34 14 47 11 38 16 73 43 52 65 81 90 69 50 22 74 92 23 54 70 39 30 40 IB Diploma Programme: Chemistry Data Booklet, March 2003 3 4 5. The Periodic Table 1 2 3 1 4 5 6 7 2 Atomic Number H 0 He 1.01 4.00 3 4 Li Be 6.94 9.01 Element Atomic Mass 5 6 7 8 9 10 B C N O F Ne 10.81 12.01 14.01 16.00 19.00 20.18 11 12 13 14 15 16 17 18 Na Mg Al Si P S Cl Ar 22.99 24.31 26.98 28.09 30.97 32.06 35.45 39.95 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr 39.10 40.08 44.96 47.90 50.94 52.00 54.94 55.85 58.93 58.71 63.55 65.37 69.72 72.59 74.92 78.96 79.90 83.80 IB Diploma Programme: Chemistry Data Booklet, March 2003 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe 85.47 87.62 88.91 91.22 92.91 95.94 98.91 101.07 102.91 106.42 107.87 112.40 114.82 118.69 121.75 127.60 126.90 131.30 † 55 56 57 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 Cs Ba La Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn 132.91 137.34 138.91 178.49 180.95 183.85 186.21 190.21 192.22 195.09 196.97 200.59 204.37 207.19 208.98 (210) (210) (222) ‡ 87 88 89 Fr Ra Ac (223) (226) (227) † ‡ 58 59 60 61 62 63 64 65 66 67 68 69 70 71 Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu 140.12 140.91 144.24 146.92 150.35 151.96 157.25 158.92 162.50 164.93 167.26 168.93 173.04 174.97 103 90 91 92 93 94 95 96 97 98 99 100 101 102 Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr 232.04 231.04 238.03 (237) (244) (243) (247) (247) (251) (254) (257) (258) (259) (260) IB Diploma Programme Chemistry Data Booklet, August 2001 4 IB Diploma Programme: Chemistry Data Booklet, March 2003 6. Melting Points and Boiling Points of the Elements 1 14 M.pt/K H 20 He 4 Element 2573 4100 63 55 54 25 B C N O F Ne 3243 3931 5100 77 90 85 27 371 922 936 1683 317 392 172 84 Na Mg Al Si P S Cl Ar 1156 1363 2740 2628 553 718 239 87 337 1112 1814 1933 1973 2130 1517 1808 1768 1726 1357 693 303 1211 889 490 266 117 K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr 1047 1757 3104 3560 3650 2755 2235 3023 3143 3005 2840 1180 2676 3103 958 332 121 312 1042 1780 2125 2741 2890 2445 2583 2239 1825 1235 594 429 505 904 723 387 161 Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe 961 1657 3611 4650 5015 4885 5150 4173 4000 3413 2485 1038 2353 2543 2023 1263 458 166 302 983 1194 2503 3269 3680 3453 3327 2683 2045 1338 234 577 601 545 527 575 202 Cs Ba La Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn 952 2023 3730 5470 5698 5930 5900 5300 4403 4100 3080 630 1730 2013 1833 1235 610 211 300 973 1320 Fr Ra Ac 950 1413 3470 454 1551 Li Be 1600 B.pt/K 5 IB Diploma Programme: Chemistry Data Booklet, March 2003 5 6 7. First Ionization Energy, Electron Affinity and Electronegativity of the Elements 1310 -72 First ionization energy / kJ mol -1 H 2370 Electron affinity / kJ mol -1 He 2.1 519 -52 900 Li Be 1.0 1.5 494 -71 Element Electronegativity 736 1400 799 -29 1090 -120 B C N 2.0 2.5 577 -47 3.0 3.5 4.0 786 -180 1060 -70 1000 -200 (S- +532) 1260 -364 Al Si P 0.9 1.2 1.5 1.8 2.1 0.8 IB Diploma Programme: Chemistry Data Booklet, March 2003 402 590 632 661 648 653 716 762 757 736 745 908 577 1680 -348 F Mg K 1310 -142 (O- +844) O Na 418 -3 762 966 S Cl 2.5 3.0 941 1140 -342 Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br 1.0 1.3 1.5 1.6 1.6 1.5 1.8 1.8 1.8 1.9 1.6 1.6 1.8 2.0 2.4 2.8 548 636 669 653 694 699 724 745 803 732 866 556 707 833 870 1010 -314 Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I 0.8 1.0 1.2 1.4 1.6 1.8 1.9 2.2 2.2 2.2 1.9 1.7 1.7 1.8 1.9 2.1 2.5 376 502 540 531 760 770 762 841 887 866 891 1010 590 716 703 812 920 Cs Ba La Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At 0.7 0.9 1.1 1.3 1.5 1.7 1.9 2.2 2.2 2.2 2.4 1.9 1.8 1.8 1.9 2.0 2.2 381 510 669 Fr Ra Ac 0.7 0.9 1.1 IB Diploma Programme Chemistry Data Booklet, August 2001 6 2080 Ne 1520 Ar 1350 Kr 1170 Xe 1040 Rn IB Diploma Programme: Chemistry Data Booklet, March 2003 8. Atomic and Ionic Radii of the Elements Atomic radius/ 10-12 m 30 H He 154 (1-) 152 Li Be 68 (1+) 30 (2+) 186 Na 98 (1+) 231 K 197 Ca 215 Sr 148 (1+) 110 (2+) 262 217 270 Fr 16 (3+) Ba 34 (2+) 220 Ra 77 C 260 (4-) Al 45 (3+) 160 Sc 81 (3+) 180 Y 93 (3+) 188 La 115 (3+) 146 Ti 90 (2+) 68 (4+) 157 Zr 80 (4+) 157 Hf 81 (4+) 131 V 88 (2+) 59 (5+) 141 Nb 70 (5+) 143 Ta 73 (5+) 125 Cr 63 (3+) 136 Mo 129 Mn 80 (2+) 60 (4+) 135 Tc 68 (4+) 137 W 68 (4+) 126 Fe 76 (2+) 64 (3+) 133 Ru 65 (4+) 137 Re 134 Os 67 (4+) 125 Co 74 (2+) 63 (3+) 134 Rh 124 Ni 72 (2+) 138 Pd 86 (2+) 135 Ir 66 (4+) 128 Cu 96 (1+) 69 (2+) 144 Ag 126 (1+) 138 Pt 144 133 Zn 74 (2+) 149 Cd 97 (2+) 152 Au Hg 137 (1+) 85 (3+) 127 (1+) 110 (2+) 141 Ga 62 (3+) 166 In 81 (3+) 171 Tl 95 (3+) 70 N 171 (3-) 117 143 65 (2+) 244 167 (1+) B Mg 94 (2+) Cs 88 Ionic radius/ 10-12 m 160 133 (1+) Rb Element 112 Si 110 P 42 (4+) 271 (4-) 122 Ge 53 (4+) 272 (4-) 162 Sn 112 (2+) 71 (4+) 175 Pb 120 (2+) 84 (4+) O 146 (2-) 121 190 (2-) 222 (3-) 202 (2-) 141 137 170 Bi 99 Te 222 (2-) 140 Po Ar 181 (1-) 114 117 Se 245 (3-) 133 (1-) Cl As Sb Ne F 104 S 212 (3-) 58 66 Br Kr 196 (1-) 133 I Xe 219 (1-) 140 At Rn 120 (3+) 200 Ac 7 IB Diploma Programme: Chemistry Data Booklet, March 2003 7 9. Covalent Bond Lengths Bond H–H C–C C=C ChC C–C (in benzene) Si–Si N–N N=N NhN P–P (P4) O–O O=O S–S (S8) S=S F–F Cl–Cl Br–Br I–I Bond length /nm 0.074 0.154 0.134 0.120 0.139 0.235 0.146 0.120 0.110 0.221 0.148 0.121 0.207 0.188 0.142 0.199 0.228 0.267 Bond Bond length /nm C–H Si–H N–H P–H O–H S–H F–H Cl–H Br–H I–H 0.109 0.146 0.101 0.142 0.096 0.135 0.092 0.128 0.141 0.160 C–O C=O C–O (in phenol) C–N C=N ChN C–N (in phenylamine) C–F C–Cl C–Cl (in chlorobenzene) C–Br C–I 0.143 0.122 0.136 0.147 0.127 0.116 0.135 0.138 0.177 0.169 0.193 0.214 0.150 Si–O 10. Average Bond Enthalpies at 298 K Bond H–H D–D C–C C=C ChC C–C (benzene) Si–Si Ge–Ge Sn–Sn N–N N=N NhN P–P O–O O=O S–S F–F Cl–Cl Br–Br I–I 8 ∆H / kJ mol-1 436 442 348 612 837 518 226 188 151 163 409 944 172 146 496 264 158 242 193 151 Bond ∆H / kJ mol-1 C–H Si–H N–H P–H O–H S–H F–H Cl–H Br–H I–H 412 318 388 322 463 338 562 431 366 299 C–O C=O C–N C=N ChN C–F C–Cl C–Br C–I 360 743 305 613 890 484 338 276 238 Si–O 374 IB Diploma Programme: Chemistry Data Booklet, March 2003 11. Organic Compounds—Thermodynamic Data Substance methane ethane propane butane pentane hexane ethene propene but-1-ene cis-but-2-ene trans-but-2-ene ethyne propyne buta-1,3-diene cyclohexane benzene benzene methylbenzene ethylbenzene phenylethene chloromethane dichloromethane trichloromethane bromomethane tribromomethane iodomethane triiodomethane chloroethane bromoethane iodoethane chloroethene 1,2-dichloroethane chlorobenzene methanol methanol ethanol ethanol phenol methanal ethanal propanone methanoic acid ethanoic acid benzoic acid ethyl ethanoate ethanamide methylamine ethylamine urea Formula CH4 C2H6 C3H8 C4H10 C5H12 C6H14 C2H4 C3H6 C4H8 C4H8 C4H8 C2H2 C3H4 C4H6 C6H12 C6H6 C6H6 C6H5CH3 C6H5CH2CH3 C6H5CHCH2 CH3Cl CH2Cl2 CHCl3 CH3Br CHBr3 CH3I CHI3 C2H5Cl C2H5Br C2H5I C2H3Cl CH2ClCH2Cl C6H5Cl CH3OH CH3OH C2H5OH C2H5OH C6H5OH HCHO CH3CHO (CH3)2CO HCOOH CH3COOH C6H5COOH CH3COOC2H5 CH3CONH2 CH3NH2 C2H5NH2 CO(NH2)2 State ∆Hf0 / kJ mol-1 ∆Gf0 / kJ mol-1 S0 / J K-1 mol-1 g g g g g g g g g g g g g g l g l g g g g l l g l l s g l l g l g g l g l s g g g l l s l s g g s -75 -85 -104 -125 -146 -167 52 20 1 -6 -10 227 185 112 -156 83 49 50 30 148 -82 -117 -132 -36 -20 -8 141 -105 -85 -31 31 -166 52 -201 -239 -235 -278 -163 -116 -166 -216 -409 -487 -385 -481 -320 -28 -49 -333 -51 -33 -24 -16 -8 0 68 63 72 67 64 209 194 152 27 130 125 122 131 214 -59 -63 -72 -26 3 20 186 230 270 310 348 387 219 267 307 301 296 201 248 279 204 269 173 320 360 345 234 179 203 246 222 163 -53 276 52 -80 99 -162 -166 -169 -175 -51 -110 -134 -152 -346 -392 -245 264 208 314 238 127 282 161 146 219 266 295 129 160 167 28 37 -47 242 285 105 IB Diploma Programme: Chemistry Data Booklet, March 2003 9 12. Ellingham Diagram Standard Gibbs free energy changes of formation, ∆G0f , for oxides given per mole of oxygen gas as a function of temperature. ∆Gf0 / kJmol−1 0 O2 d 4A g+ Ag Hg 2 O2d Hg + 2 Hg 2Ag2 O O O 2d 2Pb+ – 200 C 2PbO 2 2 d 2Fe+O – 400 C+O 2 → CO 2 Pb C O2 Fe 2CO CO – 600 2Z n Zn Cr FeO + d 2C O 2 2 Od + d +O2 4 –3 Cr Z nO 2C+ O2 d 2 2 –3 O Cr 2 3 2CO d TiO O 2 Ti+ 2 – 800 Ti d +O 2 4 – Al Al 2O 3 2 –3 3 – 1000 Al gO d 2M 2 Mg – 1200 Ca O g+O 2Ca 2M d 2 +O 2Ca 500 1000 1500 2000 2500 Temperature / K 10 IB Diploma Programme: Chemistry Data Booklet, March 2003 IB Diploma Programme: Chemistry Data Booklet, March 2003 13. Enthalpies of Combustion The values of the molar enthalpy of combustion (∆H 0c ) in the following table refer to a temperature of 298 K and a pressure of 1.01 × 105 Pa (1 atm). Substance hydrogen sulfur carbon (graphite) carbon (diamond) carbon monoxide methane ethane propane butane pentane hexane octane cyclohexane ethene buta-1,3-diene ethyne benzene methylbenzene naphthalene anthracene chloroethane bromoethane iodoethane (chloromethyl)benzene trichloromethane methanol ethanol Formula H2 S C C CO CH4 C2H6 C3H8 C4H10 C5H12 C6H14 C8H18 C6H12 C2H4 C4H6 C2H2 C6H6 C6H5CH3 C10H8 C14H10 C2H5Cl C2H5Br C2H5I C6H5CH2Cl CHCl3 CH3OH C2H5OH State ∆H 0c / kJ mol-1 g s s s g g g g g g l l l l g g g l l s s g g l l l l -286 -297 -394 -395 -283 -890 -1560 -2220 -2877 -3509 -4194 -5512 -3924 -1409 -2542 -1299 -3273 -3909 -5157 -7114 -1325 -1425 -1490 -3709 -373 -715 -1371 Substance propan-1-ol butan-1-ol phenylmethanol cyclohexanol phenol ethoxyethane methanal ethanal benzaldehyde propanone pentan-3-one phenylethanone diphenylmethanone methanoic acid ethanoic acid benzoic acid ethanedioic acid ethyl ethanoate ethanamide benzamide methylamine ethylamine phenylamine nitrobenzene urea glucose sucrose Formula State ∆H 0c / kJ mol-1 C3H7OH C4H9OH C6H5CH2OH C6H11OH C6H5OH (C2H5)2O HCHO CH3CHO C6H5CHO (CH3)2CO (C2H5)2CO CH3COC6H5 (C6H5)2CO HCOOH CH3COOH C6H5COOH (COOH)2 CH3COOC2H5 CH3CONH2 C6H5CONH2 CH3NH2 C2H5NH2 C6H5NH2 C6H5NO2 CO(NH2)2 C6H12O6 C12H22O11 1 1 l s s l g l l l l s s l l s s l s s g g l l s s s -2010 -2673 -4056 -3727 -3064 -2727 -561 -1167 -3520 -1786 -3078 -4138 -6512 -263 -876 -3227 -246 -2246 -1182 -3546 -1072 -1709 -3397 -3094 -634 -2816 -5644 11 IB Diploma Programme: Chemistry Data Booklet, March 2003 11 14. Lattice Enthalpies at 298 K (Experimental and Theoretical Values) 0 The lattice enthalpy (∆H lattice ) values given relate to the endothermic process MX(s) → M + (g) + X − (g) in which the gaseous ions of a crystal are separated to an infinite distance from each other. Experimental Values The data in these two tables are experimental values obtained by means of a suitable Born–Haber cycle. 0 / kJ mol-1 ∆H lattice Alkali metal halides Li Na K Rb Cs Other substances CaF2 BeCl2 MgCl2 CaCl2 SrCl2 BaCl2 MgO CaO SrO BaO F Cl Br I 1022 902 801 767 716 846 771 701 675 645 800 733 670 647 619 744 684 629 609 585 0 ∆H lattice / kJ mol-1 2602 3006 2493 2237 2112 2018 3889 3513 3310 3152 0 / kJ mol-1 ∆H lattice Other substances 3238 2966 2779 2643 976 955 905 890 876 640 MgS CaS SrS BaS CuCl AgF AgCl AgBr AgI NH4Cl Theoretical Values These two tables contain lattice enthalpies calculated from electrostatic principles on the basis of a purely ionic model for the crystal. 0 / kJ mol-1 ∆H lattice Alkali metal halides Li Na K Rb Cs Other substances CaF2 MgO CaO SrO BaO 12 F Cl Br I 1004 891 795 761 728 833 766 690 674 636 787 732 665 644 611 728 686 632 607 582 0 / kJ mol-1 ∆H lattice 2611 3929 3477 3205 3042 Other substances AgF AgCl AgBr AgI 0 / kJ mol-1 ∆H lattice 870 770 758 736 IB Diploma Programme: Chemistry Data Booklet, March 2003 15. Standard Electrode Potentials Oxidized species l Reduced species Li+(aq) + eK+(aq) + eCa2+(aq) + 2eNa+(aq) + eMg2+(aq) + 2eAl3+(aq) + 3eMn2+(aq) + 2eH2O(l) + eZn2+(aq) + 2eFe2+(aq) + 2eNi2+(aq) + 2eSn2+(aq) + 2ePb2+(aq) + 2eH+(aq) + eCu2+(aq) + eSO42-(aq) + 4H+(aq) + 2eCu2+(aq) + 2e½O2(g) + H2O(l) + 2eCu+(aq) + e½I2(s) + eFe3+(aq) + eAg+(aq) + e½Br2 (l) + e½O2(g) + 2H+(aq) + 2eCr2O72-(aq) + 14H+(aq) + 6e½Cl2(g) + eMnO4-(aq) + 8H+(aq) + 5e½F2 (g) + e- l l l l l l l l l l l l l l l l l l l l l l l l l l l l Li(s) K(s) Ca(s) Na(s) Mg(s) Al(s) Mn(s) ½H2(g) + OH-(aq) Zn(s) Fe(s) Ni(s) Sn(s) Pb(s) ½H2(g) Cu+(s) H2SO3(aq) + H2O(l) Cu(s) 2OH-(aq) Cu(s) I-(aq) Fe2+(aq) Ag(s) Br-(aq) H2O(l) 2Cr3+(aq) + 7H2O(l) Cl-(aq) Mn2+(aq) + 4H2O(l) F-(aq) IB Diploma Programme: Chemistry Data Booklet, March 2003 E0 / V -3.03 -2.92 -2.87 -2.71 -2.36 -1.66 -1.18 -0.83 -0.76 -0.44 -0.23 -0.14 -0.13 0.00 +0.15 +0.17 +0.34 +0.40 +0.52 +0.54 +0.77 +0.80 +1.09 +1.23 +1.33 +1.36 +1.51 +2.87 13 16. Strengths of Organic Acids and Bases The acid strengths in the following tables are given in terms of pKa values, where pKa = -log10 Ka. The dissociation constant, Ka, values are for aqueous solutions at 298 K. Base strengths are given in terms of pKb values. Carboxylic Acids Name Formula pKa methanoic ethanoic propanoic butanoic 2-methylpropanoic pentanoic 2,2-dimethylpropanoic benzoic phenylethanoic HCOOH CH3COOH CH3CH2COOH CH3(CH2)2COOH (CH3)2CHCOOH CH3(CH2)3COOH (CH3)3CCOOH C6H5COOH C6H5CH2COOH 3.75 4.76 4.87 4.82 4.85 4.86 5.05 4.20 4.31 Halogenated Carboxylic Acids Name Formula pKa chloroethanoic dichloroethanoic trichloroethanoic fluoroethanoic bromoethanoic iodoethanoic CH2ClCOOH CHCl2COOH CCl3COOH CH2FCOOH CH2BrCOOH CH2ICOOH 2.86 1.29 0.65 2.66 2.90 3.17 Phenols Name Formula phenol 2-nitrophenol 3-nitrophenol 4-nitrophenol 2,4-dinitrophenol 2,4,6-trinitrophenol C6H5OH O2NC6H4OH O2NC6H4OH O2NC6H4OH (O2N)2C6H3OH (O2N)3C6H2OH pKa 10.00 7.21 8.35 7.15 4.01 0.42 Alcohols Name Formula methanol ethanol CH3OH C2H5OH 14 pKa 15.5 16 (approximately) IB Diploma Programme: Chemistry Data Booklet, March 2003 Amines Name Formula pKb ammonia methylamine ethylamine dimethylamine trimethylamine diethylamine triethylamine phenylamine NH3 CH3NH2 CH3CH2NH2 (CH3)2NH (CH3)3N (C2H5)2NH (C2H5)3N C6H5NH2 4.75 3.36 3.27 3.28 4.20 3.07 3.36 9.38 17. Acid–base Indicators Colour change Indicator pKa pH range Acid Alkali methyl orange bromophenol blue bromocresol green methyl red bromothymol blue phenol red phenolphthalein 3.7 4.0 4.7 5.1 7.0 7.9 9.3 3.1–4.4 3.0–4.6 3.8–5.4 4.2–6.3 6.0–7.6 6.8–8.4 8.3–10.0 red yellow yellow red yellow yellow colourless yellow blue blue yellow blue red red IB Diploma Programme: Chemistry Data Booklet, March 2003 15 18. Infrared Data Characteristic ranges for infrared absorption due to stretching vibrations in organic molecules. 16 Wavenumber / cm-1 Organic molecules Bond C–Cl halogenoalkanes C–O alcohols, ethers, esters 1000 to 1300 C=C alkenes 1610 to 1680 C=O aldehydes, ketones, acids, esters 1680 to 1750 ChC alkynes 2070 to 2250 O–H “hydrogen bonded” in acids 2500 to 3300 C–H alkanes, alkenes, arenes 2840 to 3095 O–H “hydrogen bonded” in alcohols, phenols 3230 to 3550 N–H primary amines 3350 to 3500 700 to 800 IB Diploma Programme: Chemistry Data Booklet, March 2003 19. 1H NMR Data Typical proton chemical shift values (δ) relative to TMS = 0. (These values can vary slightly in different solvents.) Type of proton R CH3 R CH2 Chemical shift/ppm 0.9 R 1.3 2 R3CH O CH3 2.0 C OR R CH3 C 2.1 O 2.3 CH3 R C C 2.6 H R CH2 R O CH3 R O CH3 R C O 3.2–3.7 Hal 3.8 4.1 CH2R O O R O RHC C CH3 4.0–4.2 0.5–6.5 (can vary considerably under different conditions) H CH2 4.9–5.9 OH 7 H 7.3 O R 9.7 C H O R C 11.5 O H IB Diploma Programme: Chemistry Data Booklet, March 2003 17 20. 2-amino Acids Common name Symbol alanine Ala Structural formula H2N CH pH of isoelectric point COOH 6.0 CH3 arginine Arg H2N CH COOH CH2 CH2 10.8 NH CH2 C NH2 NH asparagine Asn H2N CH CH2 COOH C 5.4 NH2 O aspartic acid Asp H2N CH CH2 cysteine glutamine Cys Gln H2N H2N COOH 2.8 COOH CH COOH CH2 SH CH COOH CH2 CH2 5.1 5.7 C NH2 O glutamic acid Glu glycine Gly histidine His CH COOH CH2 CH2 H2N CH2 COOH H2N CH H2N 3.2 COOH 6.0 COOH H 7.6 N CH2 N isoleucine Ile H 2N CH3 18 CH COOH CH CH2 6.0 CH3 IB Diploma Programme: Chemistry Data Booklet, March 2003 Common name Symbol leucine Leu Structural formula H2N CH pH of isoelectric point COOH 6.0 CH2 CH3 lysine methionine phenylalanine Lys Met Phe H2N H2N H2N CH CH3 CH COOH CH2 CH2 CH COOH CH2 CH2 CH 9.7 CH2 CH2 NH2 5.7 S CH3 COOH 5.5 CH2 proline Pro serine Ser threonine Thr H N H2N H2N CH3 tryptophan Trp H2N COOH 6.3 CH COOH CH2 OH CH COOH CH OH CH 5.7 5.6 COOH 5.9 CH2 N H tyrosine Tyr H2N CH COOH CH2 valine Val H2N CH3 CH COOH CH CH3 IB Diploma Programme: Chemistry Data Booklet, March 2003 5.7 OH 6.0 19 21. Structural Formulas of Some Important Medicines and Drugs CH3 CH2 O C OH CH3 H C OH C O C CH3 CH3 O NHCOCH3 aspirin COOH H paracetamol (acetaminophen) ibuprofen O CH2 OH CH2 N CH3 CH2 CH3 CH2 OH CH2 N O CH2 N CH3 OCCH3 O O O OH OCCH3 OCH3 morphine codeine heroin CH3 O H3C CH2 CH HO NH2 CH CH2 NH OH CH3 O HO N N CH3 N N N CH3 N CH3 amphetamine adrenaline O R C caffeine nicotine CH3 CH3 O O NH S N N CH3 CH3 N Cl O C N O2N N O OH penicillin 20 diazepam (valium®) nitrazepam (mogadon®) IB Diploma Programme: Chemistry Data Booklet, March 2003 O N HN O CH3 N H2N HO O N CH2 CH2 CH2 CH3 O O CH3 N CH2 N O NH C Pt CH3 CH2 N CH3 NH3 CH3 O cocaine NH3 Cl CH2 CH3 acyclovir Cl N H2C CH3 cisplatin CH2 N H CH3 Lidocaine lysergic acid diethylamide (LSD) H CH3O CH2 CH2 NH2 O O CH3O P O CH3 O CH2 OCH3 mescaline N+ CH2 CH3 H N H O NH2 psilocybin CH2CH3 O C CH2CH2 N CH3 CH2CH3 procaine OH H3C H3C O CH2 CH2 CH2 CH2 CH3 tetrahydrocannabinol (THC) F3C O CH2 CH2 NH2 + Cl N H CH3 fluoxetine hydrochloride (prozac) indole IB Diploma Programme: Chemistry Data Booklet, March 2003 21 22. Structural Formulas of Some Important Biological Molecules H H H H H OH 3 H 2 1 CH3 H C C H2C C C H H2C C CH3 C CH3 H2 1 H 3 O OH OH sucrose O C H OH C H C H H O H CH2OH 4 H C H2 C C O 2 CH3 H C C 1 2 H OH lactose CH3 H HOCH2 H H HO OH OH 2 H OH H H 4 O 1 H OH O O O HO H CH2OH CH2OH CH2OH retinol (vitamin A) HO C HO C H C HO C O H CH2OH H3C CH2 CH CH3 CH2 ascorbic acid (vitamin C) CH3 CH2 CH CH3 H3C CH3 CH2 CH CH3 CH2 CH CH3 cholesterol HO CH2 CH3 CH2 vitamin D HO CH3 CH3 CH3 OH C O CH3 H3C HO O oestradiol 22 OH CH3 O progesterone testosterone IB Diploma Programme: Chemistry Data Booklet, March 2003 I OH HO CH CH2 NH CH3 I HO O HO I thyroxine NH2 C C N HN CH HC C N C adenine N C N O N H guanine HN CH C O C C N CH H2N C N H O NH2 O C N NH2 I adrenaline COOH CH CH2 C O CH C CH HN CH O C C CH3 CH N H N H cytosine uracil thymine CH3 CH3 N H NH2 N N N N –O P O– O O O O P O– O P O CH2 O O– OH OH adenosine triphosphate (ATP) CH CH2 HO CH2 C CH2 C CH2 CH2 CH3 CH C CH2 CH2 CH CH3 CH3 H3C CH CH2 N N Fe N O N C CH3 H HOOC CH2 CH2 CH2 CH2 COOH The haem group from cytochrome oxidase IB Diploma Programme: Chemistry Data Booklet, March 2003 23