H2c2o4 molar mass

Oxalic acid, H2C2O4*2H2O (molar mass = 126.07 g/mol) is often used as a primary standard for the standardization of a NaOH solution. If 0.147 g of oxalic acid dihydrate is neutralized by 23.64 mL of a NaOH solution,

a. what is the molar concentration of the NAOH solution?
b. Oxalic acid is a diprotic acid. (What is the balanced equation?)