Question

Potash alum is used as:

• A. Water softner
• B. Mordant
• C. Stop bleeding
• D. Drying agent

Answer 1

The correct option is A Water softner

• Potash alum is a chemical compound widely used as the potassium sulfate dodecahydrate. It is double salt that is used commonly in medicine and the water treatment process. Potash alum is also known as potassium alum or potassium aluminum sulfate. The chemical formula of potash alum is $K_{2}S{O}_4.A{l}_2(S{O}_4{)}_3.24H_{2}O$. It is also commonly referred to as ‘fitkari.’
• Potash alum is an important member of alum which is one of the most popular coagulants used in water treatment(water softening), especially in low-colored waters.
• Potash alum is usually used for water purification because it has the ability to stick together negatively charged colloidal parts and alum makes the colloidal particles neutral by making aluminum ions neutral this way pure water is obtained.