The chemical used to soften hard water is
Answers
calcium hydoxide
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Answer:
washing soda (Na2Co3. 10H2O) and Calcium hydroxide ( Ca(Oh) 2)
Explanation:
In boilers, the calcium and magnesium in hard waters form a hard, adherent scale on the plates. As a result of the poor heat conductivity of the scale, fuel consumption is increased, and the boiler deteriorates rapidly through the external overheating of the plates. Sodium carbonate, if present, hydrolyzes to produce free alkali that causes caustic embrittlement and failure of the boiler plates. Water is softened on a small scale by the addition of ammonia, borax, or trisodium phosphate, together with sodium carbonate (washing soda). The latter precipitates the calcium as carbonate and the magnesium as hydroxide. Water is softened on a large scale by the addition of just enough lime to precipitate the calcium as carbonate and the magnesium as hydroxide, whereupon sodium carbonate is added to remove the remaining calcium salts. In areas where the water is hard, home water softeners are used, making use of the properties of natural or artificial zeolite minerals. See also soft water; water softener.