Question

Predict whether the following salt solutions are neutral, acidic, or basic, and calculate the pH of each. Hint: Write the equation for dissociation of the salt and any equilibrium established.

0.25 M NH4Br; KB of NH3 = 1.8×10−5 0.10 M NaCN;

KA of HCN = 4.9×10−10 0.20 M NaNO2;

KA of HNO2 = 4.6×10−4