IOWA ACADEMY OF SCIENCES. 



117 



does not greatly influence the point of equilibrium, though 

 the evidence in this regard is not conclusive. Solubility 

 usually increases with temperature, and we should expect 



of zirn 



remaining m j 

 Car Z^' a^ 



Glutton 

 c u rt/e -fo 

 * "y"= curi/e for Xn SO — se ries i/lil . 



Figure 2. 



more zinc sulphide to dissolve in a given time at the 

 higher temperature, and that, therefore, the effect of the 

 reaction, 



ZnCl,-fH,S =Zn+2HCl 

 from left to right would be less in any given period. The 

 decrease in the active mass of hydrogen sulphide at the 

 higher temperature should, leaving change in ionization 

 out of account, contribute to the same result. There are, 



