316 Domestic Science 



salt formed by the neutralisation of an acid by another 

 portion of the base. They are termed " basic " salts. 

 White lead is an example. It consists of lead carbonate 

 combined with lead hydroxide, and is called basic 

 carbonate of lead. 



QUESTIONS 



1. Give reasons for considering carbon to be a non-metal. 



2. Make a list of all the oxides you know which are soluble 

 in water. What inference may be drawn from the behaviour of the 

 solutions thus formed towards litmus as to the nature of the substance 

 which has entered into combination with oxygen to form the oxide ? 



3. Why is sodium bicarbonate called an acid salt ? Is alum 

 (potassium aluminium sulphate) an acid salt ? If not, what would 

 you call it, since its solution turns blue litmus red ? 



4. Suggest methods for the preparation of the following : 

 sodium chloride : lead chloride ; copper nitrate ; iron sulphate ; 

 potassium nitrate ; sodium carbonate. 



5. Classify the following substances as binary, ternary, or 

 quaternary compounds : tin oxide ; sulphur trioxide ; sodium 

 nitrate ; potassium bisulphate ; copper carbonate ; lead iodide ; 

 water. 



6. Write down the equations for as many of the reactions which 

 occur in Experiments 138, 139, and 140 as you can. 



7. Make a list of all the methods of making salts that have been 

 mentioned in the text. 



8. If you were supplied with some caustic soda solution and 

 some sulphuric acid, name three substances you could prepare from 

 these materials. Give a full description of the method you would 

 adopt in preparing each of the bodies you mention. 



9. 26*4 c.c. of hydrochloric acid are found to neutralise 20 c.c. 

 of a solution of caustic soda. How many c.c. of the alkali will 

 neutralise one litre of the acid ? 



10. 8 g. of salt are dissolved in 100 g. of water. What weight 

 of salt is contained in 25 g. of the solution ? 



