Question

For the softening of one mole of magnesium bicarbonate, the number of mole of lime required is?

(a) 2

(b) 3

(c) 4

(d) 5

I had been asked this question during an interview for a job.

My question is from Lime Soda Process in chapter Water and its Treatment of Engineering Chemistry II

Answer 1

Correct choice is (a) 2

To explain: For the softening of one mole of magnesium bicarbonate, the number of mole of lime required is two. The ratio of bicarbonate to lime in lime-soda process is 1:2.