Titration: Molarity of Acid/Base

Question

An aqueous solution of calcium hydroxide is standardized by titration with a 0.137 M solution of perchloric acid.

If 19.5 mL of base are required to neutralize 13.5 mL of the acid, what is the molarity of the calcium hydroxide solution?

______M calcium hydroxide

Answer 1

The reaction is Ca(OH)2+2HClO4=Ca(ClO4)2+2H2O

The molar ratio of two reactants is Ca(OH)2/HClO4=1/2

Then 19.5*molarity concentration(Ca(OH)2)/13.5*0.137=1/2

Molarity concentration of Ca(OH)2=13.5*0.137/(2*19.5)=0.047M