Which of the chemicals used to soften hard water?

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Solution

The process of removing the dissolved magnesium and calcium salts causing hardness in water is called softening. For softening, chemicals such as sodium carbonate $(N a_{2} C O_{3})$ , slaked lime $(C a (O H)_{2})$ , etc can be used. Also, sodium chloride $(N a C l)$ can be used to soften hard water.

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Name the sodium compound which is used for softening hard water.

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