The Kb value for ammonia is 1.8 × 10–5 . Determine the pH  and the concentration of [OH– ] in a 0.40 M solution of ammonia?     pH:  [ H+] :

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The Kb value for ammonia is 1.8 × 10–5 . Determine the pH  and the concentration of [OH– ] in a 0.40 M solution of ammonia?    

pH: 

[ H+] :

 

pls explain why the answer is this. Pls refer to the pic

NH3 (aq) = NHÀ (aq) + OH (a)
0-40M
E
0-40-x
[NHJ TOH-1
Ko =
[NH3]
|-8X105
%3D
0.40-X
2= 0-002 68 M
TOH-)= X = 0.00268 M
%3D
[H+1[OH•]= 1. 0 xiö4
14
(0.00268) [ H*) = |-0 X10"pkao sobin 1
[ Ht)= 3.73X1012 M
please explain 9
pH =- log(H*)= - log(3.72 X16") = 11.43
3.72 X1612) = 11. 43
%3D
PH = |1. 43
[H+)= 3.73X162m
Transcribed Image Text:NH3 (aq) = NHÀ (aq) + OH (a) 0-40M E 0-40-x [NHJ TOH-1 Ko = [NH3] |-8X105 %3D 0.40-X 2= 0-002 68 M TOH-)= X = 0.00268 M %3D [H+1[OH•]= 1. 0 xiö4 14 (0.00268) [ H*) = |-0 X10"pkao sobin 1 [ Ht)= 3.73X1012 M please explain 9 pH =- log(H*)= - log(3.72 X16") = 11.43 3.72 X1612) = 11. 43 %3D PH = |1. 43 [H+)= 3.73X162m
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