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A Sample of Water Has Hardness Expressed as 185 Ppm

Question 32

Multiple Choice

A sample of water has hardness expressed as 185 ppm Ca2+(aq) .The sample is passed through an ion exchange column and the Ca2+(aq) ions are replaced by Na+(aq) 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 ppm
B) 212 ppm
C) 370 ppm
D) 92.5 ppm
E) 52.0 ppm

Correct Answer:

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