A solution of 0.316 M KOH is used to neutralize 16.0 mL H3PO4 solution

H3PO4(aq) + 3KOH(aq) �¨ K3PO4(aq) + 3H2O(l)

If 30.3 mL KOH solution is required to reach the endpoint, what is the molarity of the H3PO4 solution?

Molarity = ____________

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  1. mols KOH = M x L = ?
    Using the coefficients in the balanced equation, convert mols KOH to mols H3PO4.
    Then M H3PO4 = mols H3PO4/L H3PO4.

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