8. What compound would be formed by passing carbon dioxide into a solution of ammonium hydroxide? Write the equation.
9. Write equations for the preparation of K2CO3; of BaCO3; of MgCO3.
10. In what respects are carbonic and sulphurous acids similar?
11. Give three reasons why the reaction which takes place when a solution of calcium acid carbonate is heated, completes itself.
12. How could you distinguish between carbonates and sulphites?
13. How could you distinguish between oxygen, hydrogen, nitrogen, nitrous oxide, and carbon dioxide?
14. Could a solution of sodium hydroxide be substituted for the solution of calcium hydroxide in testing for carbon dioxide?
15. What weight of sodium hydroxide is necessary to neutralize the carbonic acid formed by the action of hydrochloric acid on 100 g. of calcium carbonate?
16. What weight of calcium carbonate would be necessary to prepare sufficient carbon dioxide to saturate 10 l. of water at 15° and under ordinary pressure?
17. On the supposition that calcium carbide costs 12 cents a kilogram, what would be the cost of an amount sufficient to generate 100 l. of acetylene measured at 20° and 740 mm.?