Homework Help: Gen Chemistry

Posted by Kevin on Saturday, December 11, 2010 at 9:06pm.

52.8 mL of a calcium chloride solution with unknown concentration was treated with phosphoric acid to remove all of the calcium ions in the form of a precipitate. The precipitate was filtered, dried and was found to have the mass of 3.9565 g. What was the concentration of the calcium chloride solution in M?

Gen Chemistry - DrBob222, Saturday, December 11, 2010 at 9:50pm
Convert 3.9565 g Ca3(PO4)2 to moles, then to moles CaCl2, then M = moles CaCl2/L CaCl2.
Gen Chemistry - Kevin, Saturday, December 11, 2010 at 10:06pm
i got the moles of Ca3(PO4)2=0.01275549 but how do i covert that to moles of CaCl2? using the stoichiometric ratio which is 1:1 or am i doing something wrong
Gen Chemistry - DrBob222, Saturday, December 11, 2010 at 10:53pm
Yes and no. Yes, you use the stoichiometric ratio but it isn't 1:1 is it? I see 3 moles CaCl2 = 1 mole Ca3(PO4)2.

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