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"#

We see that it takes 2 mol of #"H"_3"PO"_4# to completely neutralize 3 mol of #"Ca(OH)"_2#.

Therefore, the neutralization of 9 mol of #"Ca(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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