58 OXYGEN AND HYDROGEN GASES. 



precipitated by muriate of barytes. Hence it 

 is clear, that in the present experiment, the 

 quantity of sulphuric acid remaining in the 

 liquid could not amount to jojo2 of a grain. 

 Indeed, as the quantity of liquid never amounted 

 to 1000 grains,"the sulphuric acid remaining in so- 

 lution, could not be so much as %&&&-$ of a grain. 



Another portion of this residual liquid being 

 mixed with sulphate of soda, was not in the 

 least altered, showing that the liquid contained 

 no sensible portion of barytes. Thus it appears, 

 that the barytes from 13*25 grains of chloride 

 of barium, or 15*5 grains of muriate of barytes, 

 just saturate the sulphuric acid in 18*125 grains 

 of sulphate of zinc. Hence, this acid just weighs 

 5 grains. 



We see therefore, that in neutral sulphate of 

 zinc, 5*25 parts of the oxide are combined with 

 5 parts of the acid; which was the thing to be 

 proved. These two constituents added together 

 make 10*25, which subtracted from 18*125 

 leave 7*875 for the quantity of water of crystal- 

 lization. It will appear afterwards that this is 

 equivalent to 7 atoms of water. Sulphate of zinc 

 in crystals, then, is composed of 



] atom sulphuric acid 5 

 1 atom oxide of zinc 5-25 

 7 atoms water . 7*875 



18-125 



