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## Group Activity: Solutions

### Concentration

The following problems ask you to find the concentration in moles per liter (M or mol/L) or to use the concentration to find how many moles are present in a given volume of solution.

1) Find the concentration of a Mg(NO3)2 solution in which 25.0 g of Mg(NO3)2 are dissolved to make a solution with a volume of 1350 mL.

2) Find the amount of AgNO3 needed to make 375 mL of a 0.750 M solution.

3) How many moles of CuCl2 are in 535 mL of a 0.500 M solution?

4) You have a NaCl solution with a concentration of 0.87 mol/L. How many moles are in 10 mL of the solution? How many moles of NaCl are in 500 mL of solution?

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### Stoichiometry with Solutions

As with any other stoichiometry problem: find the number of moles first!
1) 3CuSO4(aq) + 2Al(s) → 3Cu(s) + Al2(SO4)3(aq)
How many mL of a 0.750 M solution of copper (II) sulfate are needed to react with an excess of aluminum to provide 14 g of copper? (Hint: work backwards)

2) Using the equation in question one, how many mL of a 0.400 mol/L copper (II) sulfate solution are required to completely react with 15 g of aluminum?
3) 2NaHCO3 + H2SO4 → Na2SO4 2H2O + 2CO2
Find the volume of 0.350 M NaHCO3 solution required to react with 7.00 g H2SO4.

4) Using the equation in question three, find the concentration of a NaHCO3 solution needed to completely react with 3 mol H2SO4. Assume you will use a volume of 5.00 L.