11. How many moles of NaCl are in 68 mL of a 0.15 M NaCl solution?
(That is physiological saline when sterilized.)
12.How many grams of NaCl do you have to put into a 5 liter container to make a physiological saline solution?
13. What volume of physiological saline solution would give you a gram of salt when evaporated?
14. What is the concentration of KCl if ten grams are dissolved in enough water to make 12 liters?
15. Sodium hydroxide and hydrochloric acid combine to make table salt and water. 14 mL of 0.1 M sodium hydroxide is added to an excess of acid. How many moles of table salt are made? How many grams of salt is that?
16. 50 mL of 0.25 M copper II sulfate evaporates to leave CuSO4 · H2O. (That is the pentahydrate crystal of copper II sulfate.) What is the mass of this beautiful blue crystal from the solution?
17. Chlorine gas is bubbled into 100 mL of 0.25 M potassium bromide solution. This produces potassium chloride and bromine gas. The bromine (which dissolves in water) is taken from the solution and measured at 27°C and 825 mmHg. What is the volume of bromine?
18. 95 mL of 0.55 M sulfuric acid is put on an excess of zinc. This produces zinc sulfate and hydrogen. How many grams of zinc sulfate are made?
19. 27.6 mL of a 0.19 M solution of silver nitrate and 15.4 mL of an unknown (but excess) amount of sodium chloride combine to make a white precipitate silver chloride and some dissolved sodium nitrate. (a) How many moles of silver chloride are made? (b) How many grams of silver chloride is that? (c) How many moles of sodium nitrate are made? (d) What is the concentration of sodium nitrate in the final solution?
20. What mass (how many grams) of potassium permanganate, KMnO4, is needed to make 1.72 liters of 0.29 M solution?
21. By my calculations, a drop of ethyl alcohol, C2H5OH , in an olympic-sized swimming pool produces a 1.2 E-10 M solution of alcohol in water. A drop is a twentieth of a mL. How many molecules of ethyl alcohol are in a drop of the water in the pool?
22. 93 mL of 0.15 M magnesium hydroxide is added to 57 mL of 0.4 M nitric acid. (Magnesium nitrate and water are formed.) What is the concentration of the magnesium nitrate after the reaction?
23. Does concentration ruin your concentration?
Answer
(That is physiological saline when sterilized.)
12.How many grams of NaCl do you have to put into a 5 liter container to make a physiological saline solution?
13. What volume of physiological saline solution would give you a gram of salt when evaporated?
14. What is the concentration of KCl if ten grams are dissolved in enough water to make 12 liters?
15. Sodium hydroxide and hydrochloric acid combine to make table salt and water. 14 mL of 0.1 M sodium hydroxide is added to an excess of acid. How many moles of table salt are made? How many grams of salt is that?
16. 50 mL of 0.25 M copper II sulfate evaporates to leave CuSO4 · H2O. (That is the pentahydrate crystal of copper II sulfate.) What is the mass of this beautiful blue crystal from the solution?
17. Chlorine gas is bubbled into 100 mL of 0.25 M potassium bromide solution. This produces potassium chloride and bromine gas. The bromine (which dissolves in water) is taken from the solution and measured at 27°C and 825 mmHg. What is the volume of bromine?
18. 95 mL of 0.55 M sulfuric acid is put on an excess of zinc. This produces zinc sulfate and hydrogen. How many grams of zinc sulfate are made?
19. 27.6 mL of a 0.19 M solution of silver nitrate and 15.4 mL of an unknown (but excess) amount of sodium chloride combine to make a white precipitate silver chloride and some dissolved sodium nitrate. (a) How many moles of silver chloride are made? (b) How many grams of silver chloride is that? (c) How many moles of sodium nitrate are made? (d) What is the concentration of sodium nitrate in the final solution?
20. What mass (how many grams) of potassium permanganate, KMnO4, is needed to make 1.72 liters of 0.29 M solution?
21. By my calculations, a drop of ethyl alcohol, C2H5OH , in an olympic-sized swimming pool produces a 1.2 E-10 M solution of alcohol in water. A drop is a twentieth of a mL. How many molecules of ethyl alcohol are in a drop of the water in the pool?
22. 93 mL of 0.15 M magnesium hydroxide is added to 57 mL of 0.4 M nitric acid. (Magnesium nitrate and water are formed.) What is the concentration of the magnesium nitrate after the reaction?
23. Does concentration ruin your concentration?
Answer
| 11. 10.2 millimols | ||
| 12. 43.9 g | 13. 0.114 L | 14. 0.0112 M |
| 15a. 1.4 E-3 mols | 15b. 0.0819 g | 16. 3.12 g |
| 17. 284 ml | 18. 8.44 g | 19a. 5.24 E-3 mols |
| 19b. 0.752 g | 19c. 5.24 E-3 mols | 19d. 122 mmolar |
| 20. 78.8 g | 21. 3.61 E9 molecules | 22. 0.152 M |
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