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The purpose of adding Na2CO3 to water of low alkalinity is to | |
A. | permit the use of alum as a coagulant. [Correct Answer] |
B. | increase the softening capacity of zeolite. [Wrong Answer] |
C. | facilitate easy regeneration of zeolite. [Wrong Answer] |
D. | all (a), (b) and (c). [Wrong Answer] |