Homework Help: Chemistry. please help

Posted by Stephanie on Wednesday, December 8, 2010 at 8:42pm.

A 0.12 g sample of unknown was placed in a flask and dissolved in 125 mL of deionized water. A solution of HCl (0.10 M) was used to titrate the sample, and 18 mL was required to reach the endpoint. What is the formula weight of the unknown?

Chemistry. please help - DrBob222, Wednesday, December 8, 2010 at 9:10pm
The problem doesn't establish that this is a mono, di, or triprotic base but I assume one(1) OH group and we shall call it B + HCl ==> BH^+ + Cl^-
How many moles HCl did we add to reach end point? That is M x L = ??
moles base = same as mole HCl added.
moles = grams/molar mass
You know moles and grams, solve for molar mass.

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