Download Dougherty Valley HS Chemistry Name: Acid Base Practice Problems

Dougherty Valley HS Chemistry
Acid Base Practice Problems I
Name:
Date:
Period:
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1. Consider the reaction HCO3 (aq) + H2O (l) H2CO3 (aq) + OH– (aq)
What are the Brønsted-Lowry acids in the reaction?
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2. Consider the reaction H2SO4 (aq) + NH3 (aq) HSO4 (aq) + NH4 (aq)
What are the conjugate acid-base pairs?
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3. Give the conjugate base for each of the following acids: HCN, HNO 2, NH4 , HF, HC2H3O2
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–2
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4. Give the conjugate acid for each of the following bases: Br , NH3, ClO , CO3 , NO2
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5. What is the [H ] for the following solutions?
–4
a. 1.25 M HCl, b. beer, pH=4.2, c. 0.250 M H2SO4, d. 5.3 x 10 M NaOH
6. What is the pH of the following solutions? Indicate whether the solution is acidic, basic, or neutral.
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–5
–4
a. 0.025 M HNO3, b. coffee, [H ]=1.4 x 10 M, c. pOH=6.19, d. 5.35 x 10 M NaOH
7. If 0.10 M solutions of the following are prepared, which has the lowest pH? HCN, NaOH, HI, NaCl, KF
8. Write the equilibrium expression for the following weak acids: HCN, HNO 2, NH4+, HF, HC2H3O2
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9. Write the equilibrium expression for the following weak bases: F , NH3, ClO , C2H3O2 , NO2
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10. Calculate the [H ], the pH, and the percent ionization for a 0.100 M solution of hydrocyanic acid, HCN
–10
(Ka=4.9 x 10 ).
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11. Calculate the [H ], the pH, and the percent ionization for a 0.150 M solution of formic acid, HCOOH
–4
(Ka=1.7 x 10 ).
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12. Calculate the [H ], the pH, and the percent ionization for a 0.150 M solution of hypochlorous acid, HClO
–8
(Ka=3.0 x 10 ).
13. A 0.125 M HNO2 solution is 5.98% ionized at 25°C. What is Ka for HNO2 at this temperature?
14. A 0.250 M ascorbic acid solution is 1.79% ionized at 25°C. What is Ka for ascorbic acid at this temperature?
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15. If the pH=2.5 for a 0.25 M solution of a weak acid, what is Ka for the acid? General Formula: HA  A + H
16. If the pH=5.35 for a 0.15 M solution of a weak acid, what is K a for the acid?
–4
17. Calculate the pH of a 0.50 M HNO2 (Ka=4.5 x 10 ) solution.
–5
18. Calculate the pH of a 0.25 M NH3 (Kb=1.8 x 10 ) solution.
–4
19. Calculate Kb for the conjugate base of nitrous acid, HNO2 (Ka=4.5 x 10 ).
–5
20. Calculate Ka for the conjugate acid of ammonia, NH3 (Kb=1.8 x 10 ).
21. Would the following salt solutions be acidic, basic, or neutral? NaCN, AlCl 3, NH4Cl, LiF, KNO3, FeCl3,
NaNO2, Ca(C2H3O2)2, Ba(ClO4)2, Li2CO3
3–
2+
2–
22. Indicate the Lewis acid and Lewis base in each of the following: [Fe(CN) 6] , [Ni(NH3)6] , CdBr4 ,
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NH3 + H NH4 , H2O + H H3O
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