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A 11.0-mL sample of an unknown H3PO4 solution requires 116mL of 0.140 KOH to completely react with the H3PO4.

What was the concentration of the unknown H3PO4 solution (answer in M).

H3PO4(aq) + 3KOH(aq) --> 3H2O(l) + K3PO4(aq)

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mols KOH = M x L = ?
mols H3PO4 = 1/3 mols KOH (look at the coefficients in the equation).
M H3PO4 = mols H3PO4/L H3PO4.

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