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Ammonium chloride or Sal Ammoniac (chemically ammonium chloride (NH<sub>4</sub>Cl); also nushadir salt, zalmiak, sal armagnac, sal armoniac, salmiakki, salmiak and salt armoniack) is, in its pure form, a clear white water-soluble crystalline salt with a biting, slightly sour taste. The aqueous ammonium chloride solution is mildly acidic.