What is the formula for ammonium hydroxide?

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Study for the IGCSE Edexcel Chemistry Test. Access flashcards and multiple choice questions with hints and explanations. Get ready for your exam!

Multiple Choice

What is the formula for ammonium hydroxide?

Explanation:
When ammonia dissolves in water, it forms ammonium ions (NH4+) and hydroxide ions (OH−). Chemists use NH4OH as a convenient way to write ammonium hydroxide, representing this combination in solution. The real situation in water is an equilibrium: NH3 + H2O ⇌ NH4+ + OH−, but for a simple formula, NH4OH is the standard way to denote ammonium hydroxide. The other options don’t fit: NH3 is just ammonia, NH4 is the ammonium ion, and NH3OH isn’t a recognized formula.

When ammonia dissolves in water, it forms ammonium ions (NH4+) and hydroxide ions (OH−). Chemists use NH4OH as a convenient way to write ammonium hydroxide, representing this combination in solution. The real situation in water is an equilibrium: NH3 + H2O ⇌ NH4+ + OH−, but for a simple formula, NH4OH is the standard way to denote ammonium hydroxide. The other options don’t fit: NH3 is just ammonia, NH4 is the ammonium ion, and NH3OH isn’t a recognized formula.

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