Calculate the hydronium and hydroxyl ion concentrations in
(i) `0.01 M HCl`
(ii) `0.005 M NaOH` solution at `298` K.

Explanation

To solve the problem, we need to calculate the hydronium ion (H₃O⁺) and hydroxyl ion (OH⁻) concentrations for two different solutions: (i) 0.01 M HCl and (ii) 0.005 M NaOH at 298 K.

### Step-by-Step Solution:

#### Part (i): 0.01 M HCl

1. **Identify the dissociation of HCl**:
HCl is a strong acid that completely dissociates in water:
...