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Chem 110- Fall 2012
Review Questions –Chapters 15 1. What mass of NaOH is required to prepare 100.0 mL of NaOH(aq) that has a pH = 13.62?
2. What is the [OH-] in 0.025 M HCl ?
3. What is the pH of 0.50 M Sr(OH)2 ?
4. The pH of an aqueous solution is 10.32. The [OH-] is …………………… 5. The [H+] in 0.050 M Mg(OH)2 at 25oC is ……………………….
6. The pH of 0.20 M HNO3 is …………………….
7. A solution is prepared by adding 200. mL of 0.125 M of HCl to a 500.0mL volumetric flask and filling it to the mark with water. The pH of this solution is ……….
8. Consider the equilibrium for an indicator: Hind(aq) + H2O(l) ⇌ H3O+ + Ind-(aq) Colorless blue What is the effect of adding NaOH to a light blue sample of this indicator? Equilibrium Shift Colour Change A. left less blue B. left more blue C. right less blue D. right more blue
9. A basic buffer solution can be prepared by mixing equal numbers of moles of A. NH4Cl and HCl B. NaCl and NaOH C. NH4Cl and NH4OH D. NaCH3COO and CH3COOH
10. Which of the following would be used to prepare an acidic buffer solution? A. HF and H3O+ B. NaHS and H2S C. NH3 and NH4Cl D. HCl and NaCl
11. A solution of AgNO3 is slowly added to a mixture containing 0.10 M I-, Cl-, Br-, and IO3-. The precipitate, which forms first, is( Hint : Compare the Ksp values)
A. AgI B. AgCl C. AgBr D. AgIO3
12. The [OH- ] is measured to be 3.3 x 10-3 mol/L in a 100 mL sample of saturated solution of Al(OH)3. The solubility of Al(OH)3 is
A. 1.1 x 10-4 mol/L B. 3.3 x 10-4 mol/L C. 1.1 x 10-3 mol/L D. 3.3 x 10-3 mol/L
13. A solution of .15 M cyanic acid (HOCN) a weak acid has pH 2.14 at 250C.What is the acid ionization constant Ka for this acid at 250C.What is the degree of ionization of this acid in this solution? 14. Benzoic acid , HC7H5O2 is a weak acid having Ka= 6.3 X 10-5 at 250C.Determine the equilibrium
Review Questions –Chapters 15 1. What mass of NaOH is required to prepare 100.0 mL of NaOH(aq) that has a pH = 13.62?
2. What is the [OH-] in 0.025 M HCl ?
3. What is the pH of 0.50 M Sr(OH)2 ?
4. The pH of an aqueous solution is 10.32. The [OH-] is …………………… 5. The [H+] in 0.050 M Mg(OH)2 at 25oC is ……………………….
6. The pH of 0.20 M HNO3 is …………………….
7. A solution is prepared by adding 200. mL of 0.125 M of HCl to a 500.0mL volumetric flask and filling it to the mark with water. The pH of this solution is ……….
8. Consider the equilibrium for an indicator: Hind(aq) + H2O(l) ⇌ H3O+ + Ind-(aq) Colorless blue What is the effect of adding NaOH to a light blue sample of this indicator? Equilibrium Shift Colour Change A. left less blue B. left more blue C. right less blue D. right more blue
9. A basic buffer solution can be prepared by mixing equal numbers of moles of A. NH4Cl and HCl B. NaCl and NaOH C. NH4Cl and NH4OH D. NaCH3COO and CH3COOH
10. Which of the following would be used to prepare an acidic buffer solution? A. HF and H3O+ B. NaHS and H2S C. NH3 and NH4Cl D. HCl and NaCl
11. A solution of AgNO3 is slowly added to a mixture containing 0.10 M I-, Cl-, Br-, and IO3-. The precipitate, which forms first, is( Hint : Compare the Ksp values)
A. AgI B. AgCl C. AgBr D. AgIO3
12. The [OH- ] is measured to be 3.3 x 10-3 mol/L in a 100 mL sample of saturated solution of Al(OH)3. The solubility of Al(OH)3 is
A. 1.1 x 10-4 mol/L B. 3.3 x 10-4 mol/L C. 1.1 x 10-3 mol/L D. 3.3 x 10-3 mol/L
13. A solution of .15 M cyanic acid (HOCN) a weak acid has pH 2.14 at 250C.What is the acid ionization constant Ka for this acid at 250C.What is the degree of ionization of this acid in this solution? 14. Benzoic acid , HC7H5O2 is a weak acid having Ka= 6.3 X 10-5 at 250C.Determine the equilibrium