Ideal Gas Law Problems - Mrs. Storer Science Website
Name: Date: Period:
Concentration, Molarity and Dilution Practice Problems (20pts)
1. What is the percent by mass of 5.0 g of NaCl mixed with 80. g of water?
2. What is the percent by mass of 25.0 g of sodium acetate mixed with 40. g of water?
3. What mass of NaOH is found in 40. g of a 10% by mass solution? How many moles of NaOH is this?
4. What mass of lithium chloride is found in 85 g of a 25% by mass solution?
5. How many g of NaCl are found in 60. g of a 4.0% solution?
6. What does molarity mean?
7. What is the molarity of a solution that contains 4.53 moles of lithium nitrate in 2.85 liters of solution?
8. What is the molarity of a solution that contains 0.00372 moles hydrochloric acid in 2.39 x 10-2 liters of solution?
9. A flask contains 85.5 g C12H22O11 (sucrose) in 1.00 liters of solution. What is the molarity?
10. Calculate the molarity if a flask contains 1.54 moles potassium sulfate K2SO4 in 125 ml of solution.
11. A chalice contains 36.45 grams ammonium chlorite NH4ClO2 in 2.36 liters of solution - calculate the molarity.
12. What mass of lithium phosphate would you need to make 2.5 liter of 1.06 M lithium phosphate Li3PO4 solution?
13. If you evaporated 250. mL of a 3.5 M solution of iron (II) nitrite, what mass of iron (II) nitrite Fe(NO2)2 would you recover?
14. If I add 25 mL of water to 125 mL of a 0.15 M NaOH solution, what will the molarity of the diluted solution be?
15. If I add water to 100 mL of a 0.15 M NaOH solution until the final volume is 150 mL, what will the molarity of the diluted solution be?
16. How much 0.05 M HCl solution can be made by diluting 250 mL of 10 M HCl?
17. I have 345 mL of a 1.5 M NaCl solution. If I boil the water until the volume of the solution is 250 mL, what will the molarity of the solution be?
18. How much water would I need to add to 500 mL of a 2.4 M KCl solution to make a 1.0 M solution?
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