Q 2623312241.     A sample of water has a hardness expressed as 80 ppm of `Ca^(2+)` This sample is I passed through an ion exchange column and the `Ca^(2+)` is replaced by `H^+`·. What is the pH of the water after !it has been so treated? [Atomic mass of Ca = 40]

A

3

B

2.7

C

5.4

D

2.4

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