Question

Temporary hardness can be removed by which of the following:

• A. Clark’s method
• B. Synthetic resins method
• C. Calgon’s method
• D. Ion-exchange method

Answer 1

The correct option is A Clark’s method

Temporary hardness is due to the presence of magnesium and calcium bicarbonates. It can be removed by Clark’s method. In this method a calculated amount of lime is added to hard water. It precipitates out calcium carbonate and magnesium hydroxide which can be filtered off.