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The residual hardness in lime-soda process is ___________

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The residual hardness in lime-soda process is ___________

(a) 0-2 ppm

(b) 5-15 ppm

(c) 15-50 ppm

(d) 50-70 ppm

I got this question in class test.

The above asked question is from Lime Soda Process in section Water and its Treatment of Engineering Chemistry II

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The correct option is (c) 15-50 ppm

Explanation: The residual hardness in lime-soda process is 15-50 ppm. Lime soda softening cannot produce a water at completely free of hardness because of the low solubility of CaCO3 and Mg(OH)2.

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