*URGENT*
I need help!!!
the answers are there, i need someone to explain please!

What is the molar mass of potassium nitrate, kno3

Achemistry student needs to standardize a fresh solution of sodium hydroxide. he carefully weighs out of oxalic acid , a diprotic acid that can be purchased inexpensively in high purity, and dissolves it in of distilled water. the student then titrates the oxalic acid solution with his sodium hydroxide solution. when the titration reaches the equivalence point, the student finds he has used of sodium hydroxide solution.calculate the molarity of the student's sodium hydroxide solution. be sure your answer has the correct number of significant digits.

12. calculate the hydroxide ion concentration of a solution with ph = 3.25. show all calculations leading to an answer