LAWS OF ELECTROLYTIC DISSOCIATION 89 



(1) and the value for [BOH] from (3), and by substituting [C] for 

 [B"^] as in (4a), we obtain: 



[H+]2 = [c] p^ + kw (5) 



kb 



h. Assuming a moderate hydrolysis (7 > 0.01 and [H+] > 10~^) 

 we may disregard the value of [0H~] in equation (2) in respect to 

 the other terms of the sum [BOH]. Thus the equation becomes 



[H+] = [BOH] (2a) 



and furthermore the value for [B+] in (4) still remains closely enough 

 under the conditions: 



(4a) 



(7) 



(8) 



c. In the case of strong hydrolysis we may likewise assume for 

 all purposes instead of equation (2) that 



[H+] = [BOH] (2a) 



from which we derive: 



[H+]» = [C] . ^ - [H+] . ^ (9) 



kb kb 



and 



Vi 



1 k 



w 



.[C] kb 



y = , - 1 (10) 



V' + 4-^. + v 



4 [C] • kb 



