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Molarity (M)
Show all work and solve the problems on a separate paper.
1. What is the molarity of a solution in which 58 g of NaCl are dissolved in 1.0 L of solution?
2. What is the molarity of a solution in which 10.0 g of AgNO3 is dissolved in 500. mL of solution?
3. How many grams of KNO3 should be used to prepare 2.00 L of a 0.500 M solution?
4. To what volume should 5.0 g of KCl be diluted in order to prepare a 0.25 M solution?
5. How many grams of CuSO4 • 5H20 are needed to prepare 100. mL of a 0.10 M solution?
Molarity by Dilution
Acids are usually acquired from chemical supply houses in concentrated form. These are diluted to the
desired concentration by adding water. Since moles of acid before dilution = moles of acid after dilution,
and moles of acid = M x V then, M1 x V1 = M2 x V2. Show all work and solve the following problems on a
separate paper.
1. How much concentrated 18 M sulfuric acid is needed to prepare 250 mL of a 6.0 M solution?
2. How much concentrated 12 M hydrochloric acid is needed to prepare 100 mL of a 2.0 M solution?
3. To what volume should 25 mL of 15 M nitric acid be diluted to prepare a 3.0 M solution?
4. To how much water should 50. mL of 12 M hydrochloric acid be added to produce a 4.0 M
solution?
5. To how much water should 100. mL of 18 mL sulfuric acid be added to prepare a 1.5 M solution?
Molality (m)
Show all work and solve the problems on a separate paper.
1. What is the molality of a solution in which 3.0 moles of NaCl is dissolved in 1.5 kg of water?
2. What is the molality of a solution in which 25 g of NaCl is dissolved in 2.0 kg of water?
3. What is molality of a solution in which 15 g of I2 is dissolved in 500? g of alcohol?
4. How many grams of I2 should be added to 750 g of CCl4 to prepare a 0.020 m solution?
5. How much water should be added to 5.00 g of KCl to prepare a 0.500 m solution?
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Molarity and Molality
Show all work and answer on a separate sheet of paper.
1. If you have 9.8 L of a solution and 256 grams of NaCl what is the molarity?
2. If you have 0.209 L of a 2.3 M HCl solution, how many moles of HCl is this?
3. If you have 34 moles dissolved in 60 L what is the molarity?
4. What is the molality of 800 moles dissolved in 4.0 kg?
5. What is the molality of 4056 grams of MgBr2 dissolved in 300 kg?
6. How many grams of fluorine are needed to make a 5.6 m solution with 230 grams of water?
7. If 7.8 x 1030 grams of hydrogen are dissolved in 5800 mL of water, what is the molarity?
8. If 1200 grams of carbon chloride are dissolved in 4.5 L of water, what is the molarity?
9. If 750 grams of aluminum bromide are dissolved in 3000 grams of water, what is the molality?
10. If a solution was made with 6.7 kg of water and is currently 2.1 m, how many grams of lithium
chloride were used?
11. If a solution was made with 3.2 x 104 mL of water and is 8 M, how many grams of zinc chloride
were used?
12. If a solution was made with 700 kg of water and is currently 0.05 m, how many grams of sodium
chloride were used?
13. If you want to make a 4.8 M solution with 540 grams of sodium carbonate, how much water
should you use?
14. If you want to make a 0.009 m solution with 1.5 x 1056 atoms of nitrogen oxide, how much
water should you use?
15. If you want to make an 8.32 M solution with 281 grams of ammonium phosphate, how much
water should you use?
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