If the Kb of a weak base is 9.0x10^-8, what is the pH of a 0.18M solution of the base
Favorites|Homepage
Subscriptions | sitemap
HOME > > If the Kb of a weak base is 9.0x10^-8, what is the pH of a 0.18M solution of the base

If the Kb of a weak base is 9.0x10^-8, what is the pH of a 0.18M solution of the base

[From: ] [author: ] [Date: 12-10-31] [Hit: ]
thats what I keep getting too.-the Ph is 0.......
I have tried solving this numerous times, and I am still not getting the correct answer. I keep getting 10.1 as my answer which is apparently wrong. Any help would be greatly appreciated!

-
10.1. is the correct answer

B + H2O <---> BH^+1 + OH^-1
Kb = [BH+][OH-] / [B]
Let [BH+] = [OH-] = X
Let [B] = 0.18 - X = 0.18 (assume X<<0.18)
9.0x10-8 = X^2 / 0.18
X = 1.27x10^-4
NOTE: assumption was good; 0.18 - 0.000127 = 0.18
pOH = -log(OH-) = 3.90
pH = 14.00-3.90 = 10.10

-
Hmm, that's what I keep getting too.

-
the Ph is 0.745
1
keywords: of,base,what,is,If,solution,0.18,9.0,pH,10,the,weak,Kb,If the Kb of a weak base is 9.0x10^-8, what is the pH of a 0.18M solution of the base
New
Hot
© 2008-2010 http://www.science-mathematics.com . Program by zplan cms. Theme by wukong .