The student used the KHP in a subsequent titration experiment where he titrated 25.00 +/- 0.03 ml of the acid against an unknown solution of NaOH. The titration required 23.70 +/- 0.10 ml of the base. What is the concentration of NaOH?

Answer 1

KHP + NaOH ==> NaKP + H2O

mols KHP = mols NaOH; therefore, you can use
mL KHP x M KHP = mL NaOH x M NaOH

There is no way this question can be answered without the concentration of the acid.