March 29, 2015

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?


Answer this Question

First Name:
School Subject:

Related Questions

Chemistry-Experiment - I did an experiment where I had 5 ml of MgCl2, then 5 ml ...
Org. Chem. - what is the precipitate formed when HCl is added? I believe the ...
Chemistry - IN my experiment, I was doing a qualitative analysis of Group I and ...
Chemistry - I have had this question in my homework, and honestly I got stuck in...
Chemistry-Please help - A solution contains one or more of the following ions: ...
Organic Chemistry - Hi, I did an extraction experiment. I've got my basic layer...
chemistry - I have to find the weight percent of Na2Co3 for my lab report that's...
chemistry - Predict if a precipitate will form when 20.00 mL of the 50% ...
CHEM - PLS help!! - What would the equation look like if you added bromine (Br) ...
chemistry - 50 ml of.10 M HNO3 is added to 50 ml of .2M CaCl2. Calculate amount ...