[jwmille3]

I just came across this problem in my homework and I do not even know how to start it:

A 0.5430-g sample of impure Ca(OH)2 is dissolved in enough water to make 27.10 mL of solution. 20.00 mL of the resulting solution is then titrated with 0.1909-M HCl. What is the percent purity of the calcium hydroxide if the titration requires 51.56 mL of the acid to reach the endpoint?

Any help would be great!!!

-jwmille3

[Yggdrasil]

Always start with a balanced chemical reaction.