What is the concentration of the acid solution?

A solution of a theoretical triprotic acid was prepared by dissolving 5.079 g of solid in enough DI water to make 500.0 mL of solution. 11.21 mL of a 0.592 M solution was required to titrate 20.00 mL of this acid's solution.

1. What is the concentration of the acid solution?

2. What is the molar mass of the acid?
Hint: You need to calculate the total moles in the 500.0 mL solution (the full 500.0 mL was NOT titrated).

Trevor H2015-10-23T00:37:06Z

11.21 mL of a 0.592 M solution was required what is this solution - I assume it to be NaOH - but you do not say this - I do not want to do calculations based on incorrect information.