Chemistry · Water (H2O)

Which sodium compound is used in the treatment of water to remove permanent hardness?

Verified Solution4 OptionsUpdated: October 2026👁️1 View

1Sodium carbonate (Na2CO3)✓
2Sodium bicarbonate (NaHCO3)
3Sodium chloride (NaCl)
4Sodium hydroxide (NaOH)

Correct answer

Sodium carbonate (Na2CO3)

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