Ammonia and anhydrous ammonium hydroxide are both chemical compounds that contain nitrogen and hydrogen. However, there are some key differences between the two compounds.

1. Physical state

Ammonia is a gas at room temperature, while anhydrous ammonium hydroxide is a liquid. This is because ammonia has a lower boiling point than anhydrous ammonium hydroxide.

2. Solubility

Ammonia is soluble in water, while anhydrous ammonium hydroxide is not. This is because ammonia reacts with water to form ammonium hydroxide, which is a soluble compound.

3. pH

Ammonia is a base, while anhydrous ammonium hydroxide is a strong base. This is because anhydrous ammonium hydroxide has a higher concentration of hydroxide ions than ammonia.

4. Uses

Ammonia is used in a variety of applications, including as a fertilizer, a cleaning agent, and a refrigerant. Anhydrous ammonium hydroxide is used primarily as a cleaning agent.

In summary, ammonia and anhydrous ammonium hydroxide are both chemical compounds that contain nitrogen and hydrogen. However, they differ in their physical state, solubility, pH, and uses.