The purpose of adding Na2CO3 to water of low alkalinity is to__________________?
Correct answer: C. Permit the use of alum as a coagulant
- A. Facilitate easy regeneration of zeolite
- B. Increase the softening capacity of zeolite
- C. Permit the use of alum as a coagulant
- D. All A , B. and C.
Explanation
Soda ash supplies carbonate alkalinity, which neutralizes the acidity produced when alum hydrolyses and allows alum to form effective flocs. It is therefore added to low-alkalinity water to permit alum coagulation.
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