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Q. Washing soda is used:
  1. for removing permanent hardness of water
  2. for disinfecting drinking water
  3. as a cleaning agent for domestic purpose
Which of the above is / are correct?
Answer: Only 1 and 3
Notes: Sodium carbonate (Na2CO3), also known as washing soda or soda ash, is used as a water softener in laundering. It competes with the magnesium and calcium ions in hard water and prevents them from bonding with the detergent being used. Sodium carbonate can be used to remove grease, oil, and wine stains. It is also used for removing the permanent hardness of water.

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