Determine the concentration of hydroxyl ions in `0.4 ` M `NH_(4) OH ` solution having
(i) no ammonium chloride
(ii) 5.35 g of `NH_(4)Cl` per litre of the solution . Ionization constnat of `NH_(4)OH ` is `1.8 xx10^(-5)`

Explanation

To solve the problem of determining the concentration of hydroxyl ions (OH⁻) in a 0.4 M NH₄OH solution under two different conditions, we will follow these steps:

### Part (i): No Ammonium Chloride

1. **Write the Ionization Reaction**:
The ionization of ammonium hydroxide (NH₄OH) can be represented as:
\[
\text{NH}_4\text{OH} \rightleftharpoons \text{NH}_4^+ + \text{OH}^-
...