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RH2 (ion exchange resin) can replace Ca+2 in hard water as RH 2 +Ca +2 ----------RCA+2H + one litre of hard water after passing through RH 2 has PH=2.Hence,hardness (in ppm) of Ca+2 is 1.200 2.100 3.50 4.125(please sir solve this question. It is from All India Aakash Test Series)
Dear student [H+] = 10^-2 Ca2+ = 10^ – 2 /2 = 40 * 10^-2 / 2 0.2 g/l Hardness = 0.2 * 10^6 / 1000 = 200 ppm
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