Can someone please answer this question

Question

How many milliliters (mL) of 0.10 M NaH solution are required to completely neutralize 20.0 ml of a 0.175 M solution of HyPO, to the phenolphthalein end point? Na0H (aq) H,PO, (ag) Na,PO, (aq) + H,O (0) unbalanced equation

Answer 1

I have no idea what the question is, as written, so I'm going to guess that it is supposed to be

3NaOH(aq) + H₃PO₄(aq) ==> Na₃PO₄(aq) + 3H₂O(l) ... balanced equation

Find moles of H3PO4

20.0 ml x 1 L/1000 ml x 0.175 mol/L = 0.0035 moles H3PO4 presnt

Find moles of NaOH needed to neutralize 0.0035 mols H3PO4 (use mole ratio in balanced equation)

0.0035 mols H3PO4 x 3 mols NaOH / mol H3PO4 = 0.0105 mols NaOH needed

Find volume of 0.10 M NaOH needed to supply 0.0105 mols

0.0105 mols NaOH x 1 L / 0.10 mols = 0.105 L = 105 mls NaOH needed