A cation exchange resin RH2 can replace Ca2+ in hard water as RH2+Ca2+→RCa+2H+. 1L of hard water (hardness xppm) after passing through RH2 has pH=2. Then value of x40 is:
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Solution
pH=2⇒[H+]=10−2[Ca2+]=10−22=5×10−3moles 5×10−3×40=200mg x=200ppm Then, the value ofx40=20040=5