The limit for the detection of Cl- ions in a sample of mineral water through gravimetric analysis is quoted as 2.5 ppb by mass. Express this detection limit as a molar concentration of Cl- ions, given that the density of water is 1.00 g cm-3.
A) 2.5 *10-9 mol cm-3
B) 7.1 * 10-11 mol cm-3
C) 1.3* 10-9 mol cm-3
D) 3.6 *10-11 mol cm-3
Correct Answer:
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