88 



MR. F. C. CALVERT ON THE SOLUBILITY OF 



SOLUBILITY OF SULPHATE OP BABYTA IN MULTIPLE VOLUMES 

 OF NITBIC ACID. 



The first series of experiments was made by placing in 

 each jar a quantity of sulphate of potash, capable of pro- 

 ducing l.OOgr. of sulphate of baryta, and adding successively 

 in each jar, multiple volumes of nitric acid having a sp. gr. of 

 1.167 at 60°, and on the sulphate being dissolved, pouring 

 into it an equivalent quantity of nitrate of baryta, previously 

 dissolved in a known volume of water. 



TABLE No. 1. 



On examining the above results, it will be observed that one 

 grain of sulphate of baryta was almost entirely dissolved in 

 40 volumes of acid, or in 466.8 grs. of nitric acid, and entirely 

 so in 933.6 grs. of the same acid, and that no precipitate was 

 formed in the other eight jars, even after standing forty-eight 

 hours. There was therefore more than 1 gr. of sulphate of 

 baryta dissolved in 1 000 grs. of acid. Desiring to obtain a 

 precipitate in all the ten jars, I employed 4J times the above 

 quantity of nitrate of baryta and sulphate of potash, and 

 obtained the following results. 



