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Silver carbonate, Ag2CO3

When the equivalent proportion of potassium carbonate or potassium hydrogen carbonate is added to a solution of Silver nitrate, silver carbonate, Ag2CO3, is precipitated as a yellow powder. Addition of excess of potassium carbonate causes simultaneous precipitation of a proportion of Silver monoxide. Pure silver carbonate is white, but is sensitive to light. At 200° C. it decomposes with evolution of carbon dioxide. Its heat of formation is 120.8 Cal. Silver nitrate precipitates from a hot, concentrated solution of potassium carbonate a double salt of the formula Ag2CO3,K2CO3. A crystalline double compound with ammonia of the formula Ag2CO3,4NH3,H2O is produced by the spontaneous evaporation in air of an ammoniacal solution of silver oxide. Under the influence of sunlight the crystals become black; and on exposure to air they lose water and ammonia, yielding silver carbonate.
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