7.52. What is the pH of 0.001 M aniline solution? The ionization constant of aniline can be taken from Table 7.7. Calculate the degree of ionization of aniline in the solution. Also calculate the ionization constant of the conjugate acid of aniline.
7.52. What is the pH of 0.001 M aniline solution? The ionization constant of aniline can be taken from Table 7.7. Calculate the degree of ionization of aniline in the solution. Also calculate the ionization constant of the conjugate acid of aniline.
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1 Answer
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Let c be the initial concentration of C6H5NH3+ and x be the degree of ionisation.
C6H5NH2 + H2O? C6H5NH3+ + OH-
c (1-x) cx cx
Kb = [C6H5NH3+] [ OH-] / [C6H5NH2]
= [cx] [cx] / [c (1 – x)]
Since x is very small and negligible 1 – x≈ 1
∴Kb= [cx] [cx] / [c] = cx2
=> x =
=
= 6.56 x 10-4
∴ [OH-] = cx = 0.001 x 6.56 x 10-4 = 6.56 x 10-7 M
[H+]= Kw / [OH-] = 10-14 / 6.56 x 10-7 = 1.52 x 10-8
pH= &ndash
...more
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