Which salts makes water hard and which salts make water soft and why?
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The hard water is softened because it no longer contains calcium or magnesium ions. ... Once the resin beads in dishwashers become saturated with calcium and magnesium ions, they must be regenerated by adding sodium chloride (common salt). The sodium ions it contains replace the calcium and magnesium ions on the beads.
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Sodium and magnesium ions are present then water is soft but in presence of chlorides and sulphates it becomes hard
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