Download Unit Seven Worksheet – 2

Unit Seven Worksheet – 2
WS – C – U7C20S3-4
Name_________________________________________________ Period__________________
Section 20.3
Part I: Matching. Match the definition with the term that best correlates to it. No definition will be
used more than once.
_____1. Amphoteric
_____7. Hydrogen-ion donor
_____2. Conjugate acid
_____8. Lewis acid
_____3. Conjugate base
_____9. Lewis base
_____4. Conjugate acid-base pair
_____10. Monoprotic acid
_____5. Diprotic acid
_____11. Triprotic acid
_____6. Hydrogen-ion acceptor
A)
B)
C)
D)
E)
F)
G)
H)
I)
J)
K)
A Bronsted-Lowry acid
A Bronsted-Lowry base
Description of a substance that can act both as an acid and a base
Acid that contains three ionizable hydrogens
Acid that contains two ionizaable hydrogens
Acid that contains one ionizaable hydrogen
Particle that remains when an acid has donated a hydrogen ion
An electron-pair acceptor
An electron-pair donor
Particle formed when a base gains a hydrogen ion
Two substances that are related by the loss or gain of a single hydrogen ion
Part III: Short Answer. Answer the following questions.
Classify each of the following acids as monoprotic, diprotic, or triprotic.
12.
HCOOH: _____________________________________________________________
13.
HBr: ________________________________________________________________
14.
H2SO3: ______________________________________________________________
15.
H3ClO4: _____________________________________________________________
16.
What would you expect to happen when lithium metal is added to water? Show the chemical
reaction.
page 1 – WS – C – U7C20S3-4
17.
Identify the hydrogen ion donor(s) and hydrogen ion acceptor(s) for ionization of sulfuric acid in
water. Label the conjugate acid-base pairs.
18.
Identify all of the ions that may be formed when H3PO4 ionizes in water.
19.
In the following chemical reaction, identify the Lewis acid and base.
BF3 + F– ↔ BF4–
Section 20.4
Part I: Matching I.
Match the definition with the term that best correlates to it. No definition will be
used more than once.
_____20. Acid dissociation constant
_____23. Strong base
_____21. Base dissociation constant
_____24. Weak acid
_____22. Strong acid
_____25. Weak base
A)
B)
C)
D)
E)
F)
Ratio of the concentration of the dissociated (or ionized) form of an acid to the concentration of
the undissociated acid; symbolized Ka
Base that dissociates completely into metal ions and hydroxide ions in aqueous solution
Acid that completely ionizes in aqueous solution
Base that does not dissociate completely in aqueous solution
Acid that only partially ionizes in aqueous solution
Ratio of concentration of conjugate acid times concentration of hydroxide ion to the
concentration of conjugate base; symbolized Kb
page 2 – WS – C – U7C20S3-4
Part II: Matching I. Match each solution with its correct description.
_____26. dilute, weak acid
A)
B)
C)
D)
E)
_____27. dilute, strong base
_____28. concentrated, strong acid
18M H2SO4(aq)
0.5M NaOH(aq)
15M NH3(aq)
0.1M HC2H3O2(aq)
0.1M HCl(aq)
_____29. dilute, strong acid
_____30. concentrated, weak base
Part III: Short Answer. Answer the following questions.
31.
Write the expression for the base dissociation constant for hydrazine, N2H4, a weak base.
Hydrazine react with water to form the N2H5+ ion.
32.
Write the base dissociation constant expression for the weak base analine, C6H5NH2.
C6H5NH2(aq) + H2O(l) ↔ C6H5NH3+(aq) + OH–(aq)
Part IV: Calculations.
33.
Solve the following problems. Show work or receive no credit. Include
proper units.
A 0.10M solution of formic acid has an equilibrium [H+] = 4.2 x 10-3 M.
HCOOH(aq) → H+(aq) + HCOO–(aq)
What is the Ka of formic acid (HCOOH)?
page 3 – WS – C – U7C20S3-4
34.
The Ka of benzoic acid, C6H5COOH, is 6.3 x 10-5. What is the equilibrium [H+] in a 0.20 M
solution of benzoic acid?
35.
A 0.10M solution of hydrocyanic acid, HCN, has an equilibrium hydrogen ion concentration of
6.3 x 10-6M. What is the Ka of hydrocyanic acid?
page 4 – WS – C – U7C20S3-4