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18 September, 20:32

The standard Gibbs energy of reaction, ÄG°, for the dissociation of phenol is 56.4 kJ mol-1 at 298 K. Calculate the pKa of phenol.

a.

9.88

c.

4.12

b.

22.8

d.

5.24

+1
Answers (1)
  1. 18 September, 22:36
    0
    a.

    9.88

    Explanation:

    ΔG = - 2.303 RT log Ka

    ΔG is change in free energy at temperature T, Ka is equilibrium constant

    - 56.4 x 10³ = 2.303 x 8.31 x 298 logKa

    - log Ka = 9.88.

    pKa = 9.88.
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