Propionic acid, CH3CH2COOH, has a Ka of 1.6x10^-6. What is the pH of a solution containing 0.5 M CH3CH2COOH (

Question

Propionic acid, CH3CH2COOH, has a Ka of 1.6x10^-6. What is the pH of a solution containing 0.5 M CH3CH2COOH (undissociated) and 0.5 M CH3CH2COO- (propionate ion)? [ such a solution can be made by adding sodium propionate to a solution of a propionic acid. ]

Answer 1

For this type of buffer solution, pH = pKa. Just take the negative log of the Ka, and that's your answer.