13^ Analysis of mixed Salts of Potassium and Sodium, 



c. The weight of the mixture a, 5 grains, multiplied by 



1 •92-^04. gives 9-62020. 



d. 9-62020 subtracted from 11-18623 gives 1-56603. 



e. 1-56603 divided by 0*52201 gives 3. 



f. The weight of the chloride of sodium in the mixture a is 



3 grains. 



g. The weight of the chloride of potassium is 2 grains. 

 The quantity of sodium equivalent to the chloride of so- 

 dium is 3 X 0-39656 



The quantity of soda is 3 x 0-53289 



The quantity of potassium equivalent to the chloride of 



potassium is 2 x 0-52534< 



The quantity of potash is 2 x 0*63257 



Analysis of Sulphates. 



METHOD. 



a. Weigh the mixed sulphates. 



h. Dissolve the sulphates, precipitate with chloride of barium, 

 and weigh the sulphate of barytes. 



c. Multiply the weight of the mixed alkaline sulphates a, by 



1*33633. 



d. Subtract the product of the multiplication c from the 



weight of the sulphate of barytes b. 



e. Divide the residue of the subtraction d by 0*29814. 



f. The product of the division e is the weight of the sulphate 



of soda contained in the mixture a. 



g. The difference between the weight of the mixed sulphates 



a, and that of the sulphate of soda^ is the weight of the 



sulphate of potash. 

 Explanation. — The quantity of sulphate of barytes pro- 

 ducible by sulphate of soda above the quantity producible by 

 sulphate of potash, is 0*29814 for every unit of the given sul- 

 phate of soda. For 



1 of sulphate of soda produces of sulphate of barytes 1*63447 

 1 of sulphate of potash produces of sulphate of barytes 1*33633 



The excess being = 0*29814 

 The further explanation of this method is the same as the 

 explanation of the analysis of the alkaline chlorides. 



Tables of Data. 



1. To find the weight of the components and equivalents 

 of any quantity of sulphate of soda, multiply it by 

 0*326095 for the sodium it contains. 

 0-673905 for the sulphur and oxygen. 

 0-43819 for the soda. 

 0-56181 for the sulphuric acid. 



