how do you solve for a problem where they ask you to identify an unknown salt (they give you three choices) when you are given the pH and the Molarity.

Answer 1

It would be easier if you posted the problem In general, however, you will know if it is a monobasic acid, dibasic, etc.
So you Use the hydrolysis of the salt and the Ka or Kb they give youand solve the molar mass.