533 



TABLK II. 



These tables clearly show the influence which a given strength 

 of nitric acid has on the solubility of the sulphate of baryta; for 

 there is a precipitate in three minutes in all the jars of the first 

 table, whilst we have a precipitate only in the first four jars of 

 Table II. 



Another fact which is observed in these tables is, that whilst 240 

 divisions of the alkalimeter of nitric acid, spec. grav. 1*167, are 

 capable of dissolving, or preventing the formation of, 4'46 grs. of 

 sulphate of baryta, 240 divisions of an acid, of spec. grav. 1-032, 

 only retained in solution 0'086 gr. It follows from these facts, that 

 in future the practice of rendering liquors acid with nitric or hydro- 

 chloric acids, must be discontinued when sulphates are to be deter- 

 mined, or separated from chromates, phosphates, &c. 



Influence of Mass on Chemical Affinity. 



The researches of the author, to illustrate the influence which 

 mass exerts on chemical affinity, are extensive ; a few of the results 

 arrived at are here given. 



The following table will clearly show the marked influence which 

 increasing volumes of nitric acid have in preventing the formation of 

 sulphate of baryta : 



