A Sample of Water Has Hardness Expressed as 81 Ppm

question 96

Multiple Choice

A sample of water has hardness expressed as 81 ppm Ca²⁺. The sample is passed through an ion exchange column and the Ca²⁺ ions are replaced by H⁺ ions. What is the pH of the water after it has been treated? (1 ppm = 1 g solute/106 g solution)

• A) 2.50
• B) 1.10
• C) 0.79
• D) 2.39
• E) 2.70

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