Question #7c141

1 Answer
Ernest Z.
Mar 31, 2017

It will take 6 mol of phosphoric acid.

Explanation:

The chemical equation for the neutralization is

"2H"_3"PO"_4 + "3Ca(OH)"_2 → "Ca"_3("PO"_4)_2 + "6H"_2"O"2H3PO4+3Ca(OH)2→Ca3(PO4)2+6H2O

We see that it takes 2 mol of "H"_3"PO"_4H3PO4 to completely neutralize 3 mol of "Ca(OH)"_2Ca(OH)2.

Therefore, the neutralization of 9 mol of "Ca(OH)"_2Ca(OH)2 will require

9 color(red)(cancel(color(black)("mol Ca(OH)"_2))) × ("2 mol H"_3"PO"_4)/(3 color(red)(cancel(color(black)("mol Ca(OH)"_2)))) = "6 mol H"_3"PO"_4

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