RH2 (ion exchange resin) can replace Ca2+ in hard water RH2+Ca2+⟶RCa+2H+I L of hard water after passing through RH2 has pH 2.Hence, hardness in ppm of Ca2+ is:
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a
200
b
100
c
50
d
125
answer is A.
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Detailed Solution
RH2+Ca2+⟶RCa+2H+Energy Ca2+ ion is replaced by two H+ ionspH = 2∴ H+=10−2M∴ Ca2+=10−22M=10−2×402g L−1∴ ppm of Ca2+=10−2×40×1062×103Ca2+=200