A solution of ammonia in water contains

Options

A. `H^(+)` (aq.)
B. `OH^(-)` (aq.)
C. `NH_(4)^(+)` (aq.)
D. `NH_(3)` (aq.)

Answer

To solve the question "A solution of ammonia in water contains," we need to analyze the behavior of ammonia (NH3) when it is dissolved in water.

### Step-by-Step Solution:

1. **Understanding Ammonia in Water**:
Ammonia (NH3) is a weak base that can dissolve in water. When ammonia is added to water, it interacts with water molecules.

2. **Dissociation Reaction**:
The reaction can be represented as:
\[ \text{NH}_3 (aq) + \text{H}_2\text{O} (l) \rightleftharpoons \text{NH}_4^+ (aq) + \text{OH}^- (aq) \]
In this reaction, ammonia accepts a proton (H+) from water, resulting in the formation of ammonium ions (NH4+) and hydroxide ions (OH-).

3. **Components in the Solution**:
From the above reaction, we can conclude that a solution of ammonia in water contains:
- Ammonium ions (NH4+)
- Hydroxide ions (OH-)
- Unreacted ammonia (NH3)
- Water (H2O)

4. **Final Composition**:
Therefore, the solution of ammonia in water contains:
- NH3 (aqueous)
- NH4+ (aqueous)
- OH- (aqueous)

### Summary of the Components:
A solution of ammonia in water contains:
- NH3 (ammonia)
- NH4+ (ammonium ion)
- OH- (hydroxide ion)