24 VETERINAEY STATE BOARD 



combustion of sulphur or by roasting iron pyrites in a suitable 

 furnace, is passed into a large chamber, or series of chambers, lined 

 with sheet lead. Nitrous fumes, produced by heating sodium nitrate 

 with a little sulphuric acid, enter the chamber at the same time ; 

 jets of steam are blown in at several points and a draft of air is 

 kept up throughout. The sulphur dioxide meeting the niteous fumes 

 is oxidized by them and with the water of the steam forms sulphuric 

 acid. 



Uses: Very extensively used in the arts, in the manufacture of 

 all the other strong acids, and fertilizers; refining sugar, fats and 

 oils ; in galvanic batteries, etc. 



Write the graphic formula and calculate the percentage composition 

 of sulphuric acid. [Atomic weight of S = 32.] 

 H-0\/0 



H_0/^^0 



2 + 32 + 64 = 98, the molecular weight of sulphuric acid. 



2/98 or 2.04 per cent, hydrogen. 



32/98 or 32.65 per cent, sulphur. 



64/98 or 65.30 per cent, oxygen. 



What is copper sulphate? How prepared? 



Copper sulphate, blue vitriol, or blue stone, is the most im- 

 portant compound of copper. It is formed in large, transparent, 

 deep-blue crystals which are easily soluble in water and have a 

 nauseous, metallic taste. Formula, CuSO^. 



It is prepared by dissolving cupric oxide in sulphuric acid, 

 evaporating and crystallizing the solution. 



DISINFECTANTS AND ANTISEPTICS 



Differentiate between disinfectants and antiseptics. 



Disinfectants are agents that destroy the microorganisms which 

 cause infectious and contagious diseases, fermentation and putre- 

 faction. 



Antiseptics are agents which prevent the growth and develop- 

 ment of the microorganisms occasioning fermentation but more 

 especially the pus-producing variety. 



What is a deodorant? 



Deodorants are agents which destroy or counteract a foul odor, 

 e.g., phenol, zinc chloride and charcoal. 



