5. What is the pH of a saturated cobalt(II) hydroxide solution in water if the Ksp is 1.10 x 10-16 for Co(OH)2 (aq)? - 8.78 b. 1.96 c. 12.04 d. 12.22 9.83 a. е.

Chemistry: Principles and Reactions
8th Edition
ISBN:9781305079373
Author:William L. Masterton, Cecile N. Hurley
Publisher:William L. Masterton, Cecile N. Hurley
Chapter14: Equilibria In Acid-base Solutions
Section: Chapter Questions
Problem 32QAP: Enough water is added to the buffer in Question 30 to make the total volume 5.00 L. (a) Calculate...
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### Acid-Base Titration and pH Calculations

---

#### Question 4

A solution of hydrofluoric acid (0.27 M, 10.00 mL) was titrated with 15.0 mL of 0.13 M sodium hydroxide \( \left( K_a \text{ of hydrofluoric acid} = 7.20 \times 10^{-4} \right) \). What is the resulting pH of this solution?

- a. 3.33
- b. 3.56
- c. 4.57
- d. 10.44
- e. 11.27

---

#### Question 5

What is the pH of a saturated cobalt(II) hydroxide solution in water if the \( K_{\text{sp}} \) is \( 1.10 \times 10^{-16} \) for \( \text{Co(OH)}_2 (\text{aq}) \)?

- a. 8.78
- b. 1.96
- c. 12.04
- d. 12.22
- e. 9.83

---

### Explanation:

**Question 4 Overview:**

This question involves the titration of hydrofluoric acid (HF), a weak acid, with sodium hydroxide (NaOH), a strong base. The Equilibrium Constant (Ka) is used to find the pH of the solution after the neutralization reaction.

**Question 5 Overview:**

This question involves finding the pH of a saturated solution of cobalt(II) hydroxide, using the solubility product constant (\( K_{\text{sp}} \)). The \( K_{\text{sp}} \) provides information necessary to calculate the hydroxide ion concentration, which can be used to determine the pH of the solution.

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Transcribed Image Text:### Acid-Base Titration and pH Calculations --- #### Question 4 A solution of hydrofluoric acid (0.27 M, 10.00 mL) was titrated with 15.0 mL of 0.13 M sodium hydroxide \( \left( K_a \text{ of hydrofluoric acid} = 7.20 \times 10^{-4} \right) \). What is the resulting pH of this solution? - a. 3.33 - b. 3.56 - c. 4.57 - d. 10.44 - e. 11.27 --- #### Question 5 What is the pH of a saturated cobalt(II) hydroxide solution in water if the \( K_{\text{sp}} \) is \( 1.10 \times 10^{-16} \) for \( \text{Co(OH)}_2 (\text{aq}) \)? - a. 8.78 - b. 1.96 - c. 12.04 - d. 12.22 - e. 9.83 --- ### Explanation: **Question 4 Overview:** This question involves the titration of hydrofluoric acid (HF), a weak acid, with sodium hydroxide (NaOH), a strong base. The Equilibrium Constant (Ka) is used to find the pH of the solution after the neutralization reaction. **Question 5 Overview:** This question involves finding the pH of a saturated solution of cobalt(II) hydroxide, using the solubility product constant (\( K_{\text{sp}} \)). The \( K_{\text{sp}} \) provides information necessary to calculate the hydroxide ion concentration, which can be used to determine the pH of the solution. ---
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