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Calculate the concentration of all species in a 0.19 M KF solution. Please dont do it wrong...

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Chemistry

Calculate the concentration of all species in a 0.19 M KFsolution.

Please dont do it wrong its been wrong all over the internet andit makes no sense

Answer & Explanation Solved by verified expert
4.4 Ratings (636 Votes)

  KF ---> K+ + F- ; KF dissociates completely.

[K+]=[ F-]= 0.19 M

               F-            +             H2O        =             HF          +             OH-

INitial:   0.19 M                                               0                           

Final:     0.19-x                                                 x                            x

Ka = 7.08*10-4 ; Kb = 10-14/7.08*10-4 = 1.41*10-11 = [HF][ OH-]/[ F-]

or, 1.41*10-11 = x2/0.19-x = x2/0.19            ;(as x<<0.19)

or, x = 1.64*10-6 M

Ans: [K+]= 0.19 M

[F-] = 0.19-x = 0.19 M     ;(as x<<0.19)

[HF]= [OH- ] =1.64*10-6 M

[H+] = 10­14/1.64*10-6 = 6.1*10­-9 M
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