Published by:
CGP EDU Academic Team
Published on: August 13, 2026
A sample of water has a hardness expressed as 77.5 ppm Ca 2+ . This sample is passed through an ion exchange column and the Ca 2+ is replaced by H + . Select correct statement(s) –
Text Solution
Verified by ExpertsThe correct answer is:
CHECK THE SOLUTION.
(a, c)
Ca 2+ + RH 2 ⎯→ CaR + 2H +
77.5 ppm = 77.5 g Ca 2+ per 10 6 mL = 77.5 × 10 –3 g L –1 Ca 2+ = 
mol L –1 Ca 2+ ion
= 
mol L –1 H + ions
∴ [H + ] = 3.875 × 10 –3
∴ pH = – log (H + ) = 2.4
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