Question

b) A salt solution was produced by dissolving \( 7.63 \mathrm{~g} \) of potassium cyanide, \( \mathrm{KCN} \) in \( 500 \mathrm{~mL} \) of distilled water. Determine the \( \mathrm{pH} \) of the salt solution. Given, \( \mathrm{K}_{\mathrm{a}} \) for \( \mathrm{HCN}=6.2 \times 10-10 \), relative molar mass for \( \mathrm{C}=12, \mathrm{~N}=14 \), \( \mathrm{K}=39.1 \mathrm{~g} / \mathrm{mol} \). (5 marks)

          b) A salt solution was produced by dissolving \( 7.63 \mathrm{~g} \) of potassium cyanide, \( \mathrm{KCN} \) in \( 500 \mathrm{~mL} \) of distilled water. Determine the \( \mathrm{pH} \) of the salt solution. Given, \( \mathrm{K}_{\mathrm{a}} \) for \( \mathrm{HCN}=6.2 \times 10-10 \), relative molar mass for \( \mathrm{C}=12, \mathrm{~N}=14 \), \( \mathrm{K}=39.1 \mathrm{~g} / \mathrm{mol} \).
(5 marks)

b) A salt solution was produced by dissolving 7.63 g of potassium cyanide, KCN in 500 mL of distilled water. Determine the pH of the salt solution. Given, Ka for HCN=6.2 × 10-10, relative molar mass for C=12, N=14, K=39.1 g / mol.
(5 marks)

Added by Katherine S.

Chemistry and Chemical Reactivity

John C. Kotz, Paul M. Treichel, Gabriela… 6th Edition

Chapter 17

Instant Answer

Solved by Expert Madhur L

07/12/2022

Step 1

The molar mass of a compound is the sum of the molar masses of its constituent elements. For KCN, the molar mass can be calculated as follows: - Molar mass of K = 39.1 g/mol - Molar mass of C = 12 g/mol - Molar mass of N = 14 g/mol Therefore, the molar mass of KCN Show more…

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b) A salt solution was produced by dissolving \( 7.63 \mathrm{~g} \) of potassium cyanide, \( \mathrm{KCN} \) in \( 500 \mathrm{~mL} \) of distilled water. Determine the \( \mathrm{pH} \) of the salt solution. Given, \( \mathrm{K}_{\mathrm{a}} \) for \( \mathrm{HCN}=6.2 \times 10-10 \), relative molar mass for \( \mathrm{C}=12, \mathrm{~N}=14 \), \( \mathrm{K}=39.1 \mathrm{~g} / \mathrm{mol} \). (5 marks)