Calculate the molarity of H3Po4 if 358ml of H3PO4 solution is completely titrated by 876ml of 0.0102M Ba(OH)2 solution? 2H3PO4+3Ba(OH)2= Ba3(PO4)2 +6H2O?

${H}_{3} P {O}_{4} \left(a q\right) + B a {\left(O H\right)}_{2} \left(a q\right) \rightarrow B a H P {O}_{4} \left(a q\right) + 2 {H}_{2} O \left(l\right)$
Is the correct equation, i.e. there is 1:1 molar equivalence between $B a {\left(O H\right)}_{2}$ and ${H}_{3} P {O}_{4} \left(a q\right)$ in water.