February 27, 2017

Homework Help: Chemistry

Posted by Jill on Sunday, March 22, 2009 at 4:59pm.

How many moles of sodium chloride must be added to an aqueous solution that contains 2.0 moles of silver nitrate
in order to precipitate 0.50 moles of silver chloride?
A) 0.25 mol
B) 0.50 mol
C) 1.0 mol
D) 2.0 mol
E) 1.5 mol

The answer is B. I have no idea what to do. I was just messing around and did some dimensional analysis, but I don't think this will help me get the right answer.

I did this:

(2.0mol AgNO3) (1 mol AgCl/4 mol AgNO3), which gives me the .50 mol AgCl. What am I missing?

Thanks a lot!

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