Tuesday
October 21, 2014

Homework Help: chemistry

Posted by dan on Saturday, June 20, 2009 at 12:16am.

A 10.0 mL sample of 3.00 M KOH(aq) is transferred to a 250.0 ml
volumetric flask and diluted to the mark. It was found that 38.5 ml of
this diluted solution was needed to react the stoichimetric point in a
titration of 10.0 mL of a phosphoric acid, H3PO4, solution. The reaction
is:
3 KOH(aq) + H3PO4(aq) K3PO4(aq) + 3 H2O(l)
a) Calculate the molarity of H3PO4 in the original solution. [3]
b) Calculate the percent , by mass, of H3PO4 in the original solution.
Assume the density of the acid is 1.00 g/mL. [2]

A) .154 M

B) Not sure, 5.8 %

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