Ammonia solution can be stored with the following chemicals except for:

• A. Acetic acid solution
• B. Sodium hydroxide solution
• C. 2-Propanol solution
• D. Cyclohexane solution

Answer: (A)

Ammonia solution is a basic aqueous solution, so it should not be stored with acids. When an acid like acetic acid meets ammonia, they neutralize to form an ammonium salt (ammonium acetate) and water. This changes the chemical composition and behavior of the mixture, which is undesirable in a storage scenario and can generate heat in a confined space.

The other substances listed do not undergo such a neutralization with ammonia under normal storage conditions. Sodium hydroxide is also a base, so it won’t form a new neutralized product with ammonia in the way an acid would. Isopropanol and cyclohexane are organic solvents that don’t react with ammonia to produce hazardous new materials in typical storage, though they should be kept separate for flammability and vapor considerations.

So, acetic acid solution is the one that cannot be stored with ammonia solution.