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Q: chemistry ( Answered 5 out of 5 stars,   0 Comments )
Question  
Subject: chemistry
Category: Science > Chemistry
Asked by: teatea-ga
List Price: $2.00
Posted: 17 Jul 2003 13:29 PDT
Expires: 16 Aug 2003 13:29 PDT
Question ID: 232141
One dm3 of a solution was prepared containing 0.0040 mole of Pb(NO3)2.
The Ksp of PbCl2 for the existing conditions is 2.4 x 10-4. F rom the
list below, choose the smallest number of moles of NH4Cl that when
added to this solution will cause PbCl2 to precipitate. (Assume no
increase in volume).
a. 0.25 mole
b. 0.30 mole
c. 0.20 mole
d. 0.15 mole
Answer  
Subject: Re: chemistry
Answered By: wonko-ga on 17 Jul 2003 16:00 PDT
Rated:5 out of 5 stars
 
http://scidiv.bcc.ctc.edu/wv/002-10.html "Online Introductory
Chemistry" Dr. Walt Volland, Bellevue Community College

1L = one cubic decimeter

Therefore, the concentration of the Pb(NO3)2 solution is 0.004M.

Ksp = [Pb] [Cl]^2 = 2.4 x 10-4

Therefore,[Cl] = (2.4 x 10-4/0.004)^1/2 = 0.25M

Because one mole of NH4Cl produces one mole of chloride ions and the
quantity of solvent is 1 L, the number of moles of NH4Cl is equal to
the concentration multiplied by the volume (1L) = 0.25 moles (Answer
A).

Sincerely,

Wonko

Additional source used: Chemical Principles, fourth edition,
Dickerson, Gray, Darensbourg, and Darensbourg, The Benjamin/Cummings
Publishing Company, Inc., 1984
teatea-ga rated this answer:5 out of 5 stars

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