230 Mr.G. Bird's Observations on indirect Chemical Analysis 



quantity of the mixture of the two bases and saturate it with 

 an acid ; and afterwards the same or an exactly equal quantity 

 is to be saturated with a second acid. From the weight of 

 the salts formed with the two acids, we get the weight of each 

 base by calculation in the following manner. 



Let the unknown quantity 1 __ 

 by weight of J ~" 



Let the unknown propor- 

 tion of salt formed by 

 the acid C *. 



Ditto by the acid D . 



V- 



Then we have first, 



a X ■{■by := h (1.) 

 d x-\-b'y^li} (2.) 



and consequently 



_hb' --h'b 



(3.) 



__ 111 a-— ha' 



(^.) 



aV — db 



PoggendorfF then directs the respective values of a;, 6, a\ V 

 to be deduced in the following manner. 

 If the atomic weights of 



The Bases. The Salts. 



that is, the unknown quantity of the salt ax, which the unknown 

 quantity x of the base A forms with the acid C, must bear the 

 same proportion to the quantity x, as the atomic weight of the 

 A C bears to that of the base A. By means of the known 

 atomic proportions are the quantities a, b, a', b' given, and 

 with them by the formulae (3.) and (4.) are the sought for pro- 

 portions by weight, x and y, of both bases found. 



An example will render this clearer. Suppose that we 

 have a mixture of potassa and soda and it is required to as- 



