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April 16, 2014

Homework Help: Chemistry

Posted by Casey on Sunday, July 11, 2010 at 12:57pm.

If 10.0g of CaCl2 and 10.0g of NaCl are dissolved in 100.0mL of solution, what is the concentration of chloride ions? (the molar mass of CaCl2 is 111.0g/mol; the molar mass of NaCl is 58.44g/mol.

I found individual molar mass of:
Ca-40.08
Cl-35.45
Na-22.99

So I divided 10g CaCl2/111.0g CaCl2 + 10g NaCl/58.44g NaCl = .262205764. I than divided by .100L = 2.61205764.

I than divided 70.9g/111.0g and 35.45g/58.44g, added them together and came up with 1.245305065.

The final answer is 3.51M.

I cannot figure out where this answer came from. Help please.

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