A Sample of Water Has Hardness Expressed as 185 Ppm

question 113

Multiple Choice

A sample of water has hardness expressed as 185 ppm Ca²⁺. The sample is passed through an ion exchange column and the Ca²⁺ ions are replaced by Na⁺ ions. What is the [Na⁺] in ppm of the water after it has been treated? (1 ppm = 1 g solute/106 g solution)

• A) 104
• B) 212
• C) 370
• D) 92.5
• E) 52.0

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