__________ is used to remove the temporary and permanent hardness of water.
- ASodium carbonate
- BCalcium oxide
- CPotassium oxide
- DHydrogen sulphide
Solution & Step-by-step Explanation
Sodium carbonate (Na
2
CO
3
), also known as washing soda, is highly effective for removing both temporary and permanent hardness from water. It reacts with dissolved calcium and magnesium chlorides or sulphates to precipitate them out as insoluble carbonates (CaCO
3
and MgCO
3
).
2
CO
3
), also known as washing soda, is highly effective for removing both temporary and permanent hardness from water. It reacts with dissolved calcium and magnesium chlorides or sulphates to precipitate them out as insoluble carbonates (CaCO
3
and MgCO
3
).