Homework Help: chemistry

Posted by amy on Monday, October 11, 2010 at 9:18pm.

A solution contains 0.245 of dissolved lead (lead ion or Pb2+.)
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 - DrBob222, Monday, October 11, 2010 at 9:31pm
Pb^+2 + 2NaCl --> PbCl2 + 2Na^+

Convert 0.245 g Pb^+2 to moles. moles = grams/molar mass

Using the coefficients in the balanced equation, convert moles Pb to moles NaCl. That gives you part a.

Convert moles NaCl to grams. g = moles x molar mass. That gives you part b.
chemistry - Kristina, Sunday, February 17, 2013 at 4:44pm
0.00097973

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