Number of moles of KHP , n = Mass/ molar mass
                                       Â
= 0.4607 g / 204.22(g/mol)
                                      Â
= 2.26x10-3 mol
The balanced molecular equation between KHP & NaOH is :
NaOH + KHP ------> NaKP+ H2O
From the balanced equation
1 mole of KHP reacts with 1 mole of NaOH
2.26x10-3 mol of KHP reacts with 2.26x10-3
mol of NaOH
Given Volume of NaOH is 20.26 mL = 20.26x10-3 L
So Molarity of NaOH , M = Number of moles / volume of NaOH in
L
                                  Â
= 2.26x10-3 mol / 20.26x10-3 L
                                  Â
= 0.111 M
Therefore the molarity of NaOH solution is 0.111 M
