April 27, 2015

Homework Help: Chemistry

Posted by Marrion on Friday, October 9, 2009 at 11:32pm.

A 0.1mol/dm^3 aqueous solution of phosphoric (V) acid, H3PO4, is mixed with a 0.1 mol/dm^3 of aqueous solution of sodium hydroxide.
Which mixture will form the salt Na3PO4?

a) 10cm^3 of H3PO4 with 30cm^3 of NaOH
b) 10cm^3 of H3PO4 with 10cm^3 of NaOH
c) 20cm^3 of H3PO4 with 10cm^3 of NaOH
d) 30cm^3 of H3PO4 with 10cm^3 of NaOH

I've written down the equation, and 1 mol of the acid should mix with 3 mols of the hydroxide to form 1 mol of the salt. But i don't understand, shouldn't all the options form the salt no matter the volume? And, the correct answer should be C, and i don't understand at all!

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