Question

Name the substance used to remove permanent hardness. When this substance is added to hard water containing calcium sulphate which compound is produced  as the precipitate?​

Answer 1

Answer:

The chemical substance used for removal of permanent hardness of water is Washing soda that is sodium carbonate .

This type of water hardness is due to the presence of calcium or magnesium sulphates or chlorides. Permanent hardness cannot be removed by boiling. It can be removed by using water softeners.

Cleaning with soap is effective in soft water. Soap lathers better in soft water and is scum free. Things become cleaner and time, money and energy are saved.