Ammonium chloride (NH4Cl), also called sal ammoniac,
ammonium chloride [Credit: Martin Walker]the salt of ammonia and hydrogen chloride. Its principal use is as an electrolyte in dry cells, and it is also extensively employed as a constituent of galvanizing, tinning, and soldering fluxes to remove oxide coatings from metals and thereby improve the adhesion of the solders. It is a component of many proprietary cold medicines and cough remedies. Ammonium chloride is a colourless crystalline substance. It is highly soluble in water, readily forming a slightly acidic solution. It vaporizes without melting at 340 °C (644 °F) to form equal volumes of ammonia and ... (100 of 150 words)