Inorganic Chemistry Answers

1. What is the mass of a 4.0 % NaOH solution by mass that contains 15.0 G of NaOH?

2. The hardness of water (hardness count) is usually expressed as parts per million (by mass) of CaCO3. What is the molar concentration of Ca²+ ions in a water sample with a hardness count of 175 ppm?

3. A 13.0 % solution of K2CO3 by mass has a density of 1.09 g/cm³ . Calculate the molarity of the solution.

4. A bottle of a certain ceramic tile cleanser, which is essentially a solution of hydrogen chloride, contains 130g of HCl and 750 g of water. What is the percent by mass of HCl in the cleanser?

5. What volume of a 0.20M K2SO4 solution contains 57 g of K2SO4?

6. Calculate what volume of a sulfuric acid solution (specific gravity = 1.07; and containing 10.0 % H2SO4 by mass) contains 18.50 g of pure H2SO4 at a temperature of 25°C.

7. How would a prepare 500 mL of a 1.5 M NaOH solution, starting with a 5.0 M NaOH solution?

8. How many grams of potassium nitrate, KNO3, are needed to prepare 250.0 mL of a 3.00 x 10-2 M KNO3 solution?

9. The word “proof” on alcoholic beverages is defined as twice the percentage by volume. How many mL of alcohol are in a one-liter bottle of 80-proof gin?

10. How much solute are present in a solution that contains 100.0 g of water, and is 9.0 % by weight sodium bicarbonate, NaHCO3?