Homework Help: Chemistry

Posted by Neha on Sunday, July 10, 2011 at 9:42am.

2NaF + CaCl2 Би CaF2 + 2NaCl
An excess of 0.20 M NaF is used to precipitate the calcium ions from a
50.0 mL sample of a calcium chloride solution. What is the concentration
of the original calcium chloride solution?

Chemistry - DrBob222, Sunday, July 10, 2011 at 1:07pm
Ya gotta have more info, like the mass of the CaF2 pptd.
Chemistry - Neha, Sunday, July 10, 2011 at 5:00pm
In regards to DrBob222, there were 3 parts to this question; the first part said there were .1952 g and the mols were 2.504 * 10^-3 mol. But I don't know if this part refers to the first part because it doesn't sound like it does.
Chemistry - DrBob222, Sunday, July 10, 2011 at 8:20pm
0.1952 g CaCl2/molar mass CaF2 = 0.002504 mole CaF2. Convert that to moles CaCl2 which is 0.002504.
Then concn CaCl2 = mole CaCl2/L soln = ? 0.002504/0.050 L = ??M
Chemistry - Neha, Monday, July 11, 2011 at 9:16am
Thanks!

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