Homework Help: Chemistry

Posted by Katie on Saturday, May 14, 2011 at 5:06pm.

A solution contains 0.133 g of dissolved Lead. How many moles of soduim chloride must be added to the solution to completly precipitate all of the disolved lead? What mass of sodium chloride must be added?

Chemistry - DrBob222, Saturday, May 14, 2011 at 5:32pm
A solved example. Just follow the steps.
http://www.jiskha.com/science/chemistry/stoichiometry.html
Chemistry - Chad, Sunday, May 15, 2011 at 4:39pm
a solution contains 0.133 g of dissolved lead. How many moles of sodium chloride must be added to the solution to completely precipitate all of the dissolved lead? what mass of sodium chloride must be added?
Chemistry - Anonymous, Saturday, September 29, 2012 at 3:45pm
Ok so first of all equation:
Pb2+ + 2Cl- = PbCl
Then we do some stoich
so we find the mole of the lead n=m/M
n=.133/207.2
n=6.4x10^-4mol
Now by using the mole ratio
for every Lead solution ion there need to be 2 Sodium solution (sodium chloride) ions
therefore double the amount in mol
12.8x10^-4mol
or
1.28x10^-3mol

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