502 DIVEES AND HAGA : DECOMPOSITION OF 



Sulphur as dioxide ; as trioxide and amidosulphate. 



Found 3.5 96.2 



Calc 3.7 96.3 



An experiment with sodium hydroxyamidosulpliate and its 

 equivalent of copper sulphate, gave results indicating that about 

 0.3 per cent yielded all its sulphur as dioxide, the rest of the 

 salt giving sulphur trioxide (sulphuric acid) and amidosulphate 

 (equation 1) : 



Sulphur as dioxide ; as trioxide ; as amidosulphate ; as acidit}-. 



Found .5.5 46.0 48.0 21.6 



Calc 5.3 47.4 47.4 21.0 



Copper hydroxyamidosulpliate in four experiments gave re- 

 sults agreeing nearly with the assumption that 13.2 per cent, of 

 the salt gave sulphur dioxide, the rest decomposing according to 

 equation (1) : 



Sulphur as dioxide ; as trioxide ; as amidosulphate : as acidity. 



Found 13.0 43.0 43.6 11.1 



„ 13.0 43.3 43.2 



„ 13.1 86.6 



„ 13.3 86.5 



Calc 13.2 43.4 43.4 15.1 



In anothar experiment copper hydroxyamidosulphate gave 

 the following results, as against calculation for 15.4 per cent, to 

 decompose so as to yield its sulphur as dioxide : 



Sulphur as dioxide ; as trioxide ; as amidosulphate ; as acidity. 



Found 15.1 42.9 41.6 10.7 



Calc 15.4 42.3 42.3 13.5 



In one more trial, copper hydroxyamidosulphate decomposed 

 nearly as if 16.6 per cent, of it yielded all of its sulphur as dioxide : 



