@chemistry_icon: Ammonia (NH) is a weakly basic gas. However, as a dry gas, it cannot easily exchange protons to trigger an indicator color change. • The Role of Moisture: This is why the red litmus paper must be damp. When the ammonia vapor encounters the water on the damp paper, it dissolves and reacts to form a weak solution of ammonium and hydroxide ions: • The Color Change: The production of hydroxide ions (OH-) raises the pH of the moisture on the paper, making it alkaline. Litmus is a natural water-soluble mixture of dyes that turns blue under basic conditions (specifically when the pH rises above roughly 8.3). This localized basic environment causes the red paper to shift to a distinct blue.#ammonia #chemicalreaction #Science #Science #experiment

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Wednesday 22 July 2026 19:55:32 GMT