Question

It was found that 39.9 mL
of this diluted solution solution was needed to
reach the stoichiometric point in a titration of
7 mL of a phosphoric acid solution according
to the reaction 3KOH(aq) + H3PO4(aq) !
K3PO4(aq) + 3H2O(L)
Calculate the molarity of the solution.
Answer in units of M

Answer 1

This question is incomplete. It contains insufficient information to answer.

Answer 2

H3PO4 + 3KOH ==>K3PO4 + 3H2O
mols KOH = M x L = ?
mols H3PO4 = 1/3 that (from the coefficients).
M H3PO4 = mols H3PO4/H3PO4