# Chemistry

posted by .

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.

• Chemistry -

I expect if I look really hard I could find exactly where you went off track but it is easier to show you how to do the problem.
Plan: Determine molarity CaCl2 and molarity NaCl, then multiply M CaCl2 by 2 (to find M Cl) and add to molarity NaCl.

mols CaCl2 = 10/111 = 0.09
M = moles/L = 0.09/0.1 = 0.9 M CaCl2
M Cl in CaCl2 is 2 x 0.9 = 1.8

moles NaCl = 10/58.44 = 0.171
M = moles/L = 0.171/0.1 = 1.71 M NaCl.
then 1.8 + 1.71 = 3.51 M to three s.f.

## Similar Questions

1. ### chemistry

If you know that the mass concentration of a NaCl solution is 58.5 g/L, the molar concentration (mol/L) of the solution is ?
2. ### chemistry

What mass (in grams) of CaCl2(s) must be dissolved in pure water at 10.0 deg Celsius to make a 26.4 mL solution and to increase the solution temperature to 16.4 deg Celsius?
3. ### chemistry URGENT (1)

What mass (in grams) of CaCl2(s) must be dissolved in pure water at 10.0 deg Celsius to make a 26.4 mL solution and to increase the solution temperature to 16.4 deg Celsius?
4. ### Chemistry

A solution is made by dissolving 0.100 mol of NaCl in 5.35 mol of water. What is the mass % of NaCl?
5. ### Chemistry

If 10.0g of CaCl2 and 10.0g of NaCl are dissolved in 100.0mL of solution, what is the concentration of chloride ions?
6. ### chem

How many grams of CaCl2 (molar mass = 111.0 g/mol) are needed to prepare 4.44 L of 0.500 M CaCl2 solution?
7. ### Chemistry

If there are 0.625 g of NaCl left in a beaker that originally contained 75.0 mL of saltwater, what must have been the molar concentration of the original solution?
8. ### chemistry

1. How many grams of calcium chloride (CaCl2) are there in 600.0 mL of an aqueous solution that has a concentration of 0.450 M CaCl2?
9. ### chemistry

I have two that I can not figure out: #1: calculate the MOLALITY of 10.00 g/L of the salt, if its molar mass is 100.0 g/mol and solution density D=1.100 g/mL work: 10.00 g NaCl x (1mL/1.100g) x (1kg/1000 mL)= 0.00909 kg 100.0 g x (1 …
10. ### Chemistry

Determine the number of moles of NaCl in the solution. Measured Mass of NaCl: 11.69g Measured Vol of Water: 100mL Molar Mass of NaCL: 58.44g/mol 11.69gNaCL/58.44g/mol = 0.20 mol NaCl Do I then to multiply my answer by 100ml?

More Similar Questions

Post a New Question