Question

1)Once acid was added to the supplement, what was the purpose of filtering the solution?

A) To remove the solid impurities

B) To remove the calcium ion from the solution

C) To remove the aqueous impurities

D) To obtain solid calcium

2) When sodium carbonate is added to the filtrate, fizzing occurs. Which gas is being produced?

A) carbon dioxide

B) carbon monoxide

C) water

D) oxygen

3) What was the purpose of heating the calcium carbonate precipitate?

A) to boil off any extra impurities.

B) None are Correct.

C) so it would form larger particles that would not clog the filter paper.

D) to evaporate the water to obtain solid calcium carbonate.

4) How many milligrams of calcium is in 1.27-g of calcium carbonate?

5) What is the percent mass of calcium in a calcium supplement if 1.33-g of calcium carbonate is extracted from a 2.25-g pill?

Answer 1

1) After the addition of the acid, the solution is filtered,

A) to remove solid impurities

2) When Na2CO3 is added, the gas evolved would be,

B) carbon dioxide

3) The purpose of heating CaCO3 precipitate is,

C) So it would form larger particles that would not clog the filter paper

4) miligrams of Ca in 1.27 g CaCO3 = (1.27 g/100.0869 g/mol) x 40.078 g/mol x 1000 mg = 508.55 mg

5) mass of Ca in supplement = (1.33 g/100.0869 g/mol) x 40.078 g/mol = 0.5326 g

percent mass of Ca = 0.5326 g x 100/2.25 g = 23.67%