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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

Correct Answer:

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