April 18, 2014

Homework Help: Chemistry HELP!!!

Posted by Brittany Rusk on Thursday, September 28, 2006 at 1:24pm.

Only one question, it would be greatly appreciated if you would help me Thanx

In an experiment, Na2CO3(aq) was added to 25.0 mL of CaCl2(aq) solution until no more precipitate was formed. The mass of precipitate produced was 2.50 g. Some statements about the experiment follows.

1. Determine the moles of CaCl2(aq).
2. Determine the concentration of CaCl2(aq)
3. Calculate the moles of CaCO3(aq)
4. Calculate the moles of Na2CO3(aq)

What is the correct sequence of statement required to determine the concentration of the CaCl2(aq) solution?

CaCl2(aq) + Na2CO3(aq) ==> CaCO3(s) + 2NaCl)aq)

1. mols CaCO3 = g/molar mass
2. convert mols CaCO3 to mols CaCl2.
3. M CaCl2 = mols/L
mols Na2CO3 are not needed, and in fact, can't be calculated because, presumably, an excess was added.

I hope this helps. Be sure to repost if you have any questions.

thanks Dr. Bob 22 for helping me get an idea how to do this Thanx

what are the new compounds that form when you combine CaCl2 aq and Na2CO3 aq?


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