Elements, Symbols and Analyses. 185 



Analyses, continued. 



46. Sulphate of Potash. (Two samples. ) 

 The double sulphate of potash and magnesia is usually sold 

 as " sulphate of potash." 



i. ii. 



Actual potash 27.76 51.28 



Equivalent sulphate of potash 51.3 94.8 



47. Sulphate of Magnesia. 



Moisture at 100 C. . . . 29.01 Sulphuric acid 30.35 



Magnesium oxide ...'.. 15.87 Insoluble matter ....... 6.29 



48. Nitrate of Soda. 



Nitrate of soda is mined in Chili and purified there before 

 shipment. It usually contains about 16 per cent, of nitrogen, 

 equivalent to 97 per cent, of pure nitrate of soda. It contains 

 besides, a little salt and some moisture. 



Moisture 35 Sulphate of soda 21 



Salt (sodium chloride). . .23 Pure nitrate of soda . . .99.21 



49. Muriate of Potash. (Two samples.) 



Commercial muriate of potash consists of about 80 per cent, 

 of muriate of potash (potassium chloride) ; 15 per cent, or 

 more of common salt (sodium chloride), and 4 per cent, or more 

 of water. 



i. n. 



Actual potash 50.0 52.82 



Equivalent muriate 79.2 83.7 



50. German Potash Salts Average of n Analyses. 



Moisture at 100 C 13.14 Magnesium oxide 9.25 



Potassium oxide 21.63 Sulphuric acid 10.85 



Sodium oxide 13-76 Chlorine 35- 6 3 



Calcium oxide 85 Insoluble matter 2.08 



