Calculate the pH of a 0.20 M solution of KCN at 25.0°C. Express the pH numerically using two decimal places.

Calculate the pH of a 0.20 M solution of NH_{4}Br at 25.0°C. Express the pH numerically using two decimal places.

Calculate the pH of a 0.20 M solution of NH_{4}Br at 25.0°C. Express the pH numerically using two decimal places.