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**Solutions Worksheet** **//<---Previous Assignment - Next Assignment--->media type="custom" key="6581999"//** **__ Molarity Calculations __** Bair - need to do some examples and prettify this page

//Calculate the molarities of the following solutions://

1) 2.3 moles of sodium chloride in 0.45 liters of solution.

2) 1.2 moles of calcium carbonate in 1.22 liters of solution.

3) 0.09 moles of sodium sulfate in 12 mL of solution.

4) 0.75 moles of lithium fluoride in 65 mL of solution.

5) 0.8 moles of magnesium acetate in 5 liters of solution.

6) 120 grams of calcium nitrite in 240 mL of solution.

7) 98 grams of sodium hydroxide in 2.2 liters of solution.

8) 1.2 grams of hydrochloric acid in 25 mL of solution.

9) 45 grams of ammonia in 0.75 L of solution.

//Explain how you would make the following solutions. You should tell how many grams of the substance you need to make the solution, not how many moles.//

10) 2 L of 6 M HCl

11) 1.5 L of 2 M NaOH

12) 0.75 L of 0.25 M Na2SO4

13) 45 mL of 0.12 M sodium carbonate

14) 250 mL of 0.75 M lithium nitrite

15) 56 mL of 1.1 M iron (II) phosphate

16) 6.7 L of 4.5 M ammonium nitrate

17) 4.5 mL of 0.05 M magnesium sulfate

18) 90 mL of 1.2 M BF3

**Dilutions Worksheet **

1) If I have 340 mL of a 0.5 M NaBr solution, what will the concentration be if I add 560 mL more water to it?

2) If I dilute 250 mL of 0.10 M lithium acetate solution to a volume of 750 mL, what will the concentration of this solution be?

3) If I leave 750 mL of 0.50 M sodium chloride solution uncovered on a windowsill and 150 mL of the solvent evaporates, what will the new concentration of the sodium chloride solution be?

4) To what volume would I need to add water to the evaporated solution in problem 3 to get a solution with a concentration of 0.25 M?

**__ Molarity Practice Problems __**

1) How many grams of potassium carbonate are needed to make 200 mL of a 2.5 M solution?

2) How many liters of 4 M solution can be made using 100 grams of lithium bromide?

3) What is the concentration of a 450 mL solution that contains 200 grams of iron (II) chloride?

4) How many grams of ammonium sulfate are needed to make a 0.25 M solution at a concentration of 6 M?

5) What is the concentration of a solution that has a volume of 2.5 L and contains 660 grams of calcium phosphate?