Homework Help: chemistry

Posted by nooor on Friday, November 16, 2012 at 11:15am.

0.4324 g sample of a potassium hydroxide-lithium hydroxide mixture requires 28.28 ml of 0.3520 M HCl for its titration to the equivalence point. What is the mass percent lithium hydroxide in this mixture?

chemistry - DrBob222, Friday, November 16, 2012 at 4:33pm
You need two equations in two unknowns.
mass KOH + mass LiOH = 0.4324g
mols KOH + mols LiOH = 0.02828 x 0.3520
-----------------
Let X = mass KOH
and Y = mass LiOH
-----------------
X + Y = 0.4324
(X/molar mass KOH) + (Y/molar mass LiOH) = 0.02828 x 0.03520
Solve the two equations for X and Y, then,
mass % LiOH = (g LiOH/mass sample)*100 = ?
Post your work if you get stuck.

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