EXERCISES
1. How could you detect lead if present in tin foil?
2. Stannous chloride reduces gold chloride (AuCl3) to gold. Give equation.
3. What are the products of hydrolysis when stannic chloride is used as a mordant?
4. How could you detect arsenic, antimony, or copper in lead?
5. Why is lead so extensively used for making water pipes?
6. What sulphates other than lead are insoluble?
7. Could lead nitrate be used in place of barium chloride in testing for sulphates?
8. How much lead peroxide could be obtained from 1 kg. of minium?
9. The purity of white lead is usually determined by observing the volume of carbon dioxide given off when it is treated with an acid. What acid should be used? On the supposition that it has the formula 2PbCO3·Pb(OH)2, how nearly pure was a sample if 1 g. gave 30 cc. of carbon dioxide at 20° and 750 mm.?
10. Silicon belongs in the same family with tin and lead. In what respects are these elements similar?
11. What weight of tin could be obtained by the reduction of 1 ton of cassiterite?
12. What reaction would you expect to take place when lead peroxide is treated with hydrochloric acid?
13. White lead is often adulterated with barytes. Suggest a method for detecting it, if present, in a given example of white lead.