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Test for Ammonium Ions

Aqueous sodium hydroxide, NaOH, is added to the solution to be tested. Aqueous ammonium ions react with aqueous hydroxide ions to form ammonia gas. The mixture is warmed to release the ammonia gas. Ammonia will turn moist pH indicator paper blue.NH4+(aq) + OH-(aq) → NH3(g) + H2O(l)

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Specification: OCR Chemistry A (H032), AS-level, 3.1.4 Qualitative analysis. Topic: Reactivity Trends.

Key terms in this lesson

Ion
A positively or negatively charged atom or group of atoms, formed by the loss or gain of electrons.
Enthalpy
A measure of the total energy of a chemical system.

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