EXERCISES
1. How do we account for the fact that liquid hydrofluoric acid is not an electrolyte?
2. Why does sulphuric acid liberate hydrofluoric acid from its salts?
3. In the preparation of chlorine, what advantages are there in treating manganese dioxide with a mixture of sodium chloride and sulphuric acid rather than with hydrochloric acid?
4. Why must chlorine water be kept in the dark?
5. What is the derivation of the word nascent?
6. What substances studied are used as bleaching agents? To what is the bleaching action due in each case?
7. What substances studied are used as disinfecting agents?
8. What is meant by the statement that hydrochloric acid is one of the strongest acids?
9. What is the meaning of the phrase aqua regia?
10. Cl2O is the anhydride of what acid?
11. A solution of hydriodic acid on standing turns brown. How is this accounted for?
12. How can bromine vapor and nitrogen peroxide be distinguished from each other?
13. Write the equations for the reaction taking place when hydriodic acid is prepared from iodine, phosphorus, and water.
14. From their behavior toward sulphuric acid, to what class of agents do hydrobromic and hydriodic acids belong?
15. Give the derivation of the names of the elements of the chlorine family.
16. Write the names and formulas for the binary acids of the group in the order of the stability of the acids.
17. What is formed when a metal dissolves in each of the following? nitric acid; dilute sulphuric acid; concentrated sulphuric acid; hydrochloric acid; aqua regia.
18. How could you distinguish between a chloride, a bromide, and an iodide?
19. What weight of sodium chloride is necessary to prepare sufficient hydrochloric acid to saturate 1 l. of water under standard conditions?
20. On decomposition 100 l. of hydrochloric acid would yield how many liters of hydrogen and chlorine respectively, the gases being measured under the same conditions? Are your results in accord with the experimental facts?