`K_(a)` for acetic acid at `27^(@)C` is `2.0 xx 10^(-5)` and at `77^(@)C, K_(a) is 2.5 xx 10^(-5)`. What are `DeltaH^(Theta)` and `DeltaS^(Theta)` for the ionisation of acetic acid?

Explanation

To find the standard enthalpy change (ΔH°) and standard entropy change (ΔS°) for the ionization of acetic acid, we can use the given equilibrium constants (K_a) at two different temperatures.

### Step-by-Step Solution:

1. **Write the Expression for K_a**:
The ionization of acetic acid (CH₃COOH) can be represented as:
\[
CH_3COOH \rightleftharpoons CH_3COO^- + H^+
...