Chemical (A) is used for water softening to remove temporary hardness. (A) reacts with Na2CO3 to generate caustic soda. When CO2 is bubbled through (A), it turns cloudy.

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Chemical (A) is used for water softening to remove temporary hardness. (A) reacts with Na2CO3 to generate caustic soda. When CO2 is bubbled through (A), it turns cloudy.

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