Question

Convert 1300 ppm sodium chloride salt concentration into meq/l

• A. 22.22
• B. 20.22
• C. 18.75
• D. 23.25

Hint:

Divide the ppm value by the equivalent weight of NaCl, 58.5.

Answer 1

The Correct Option is A

Think of ppm as milligrams of NaCl dissolved in one litre of solution, since 1 ppm in a dilute water solution equals 1 mg/l.
So 1300 ppm sodium chloride means 1300 mg of NaCl in every litre.
Each equivalent of NaCl weighs 58.5 g, which is 58500 mg, and one meq is a thousandth of that, so one meq of NaCl weighs 58.5 mg.
Dividing the total salt present by the weight of one meq gives the number of meq present per litre, $rac{1300}{58.5} = 22.22$.
\[ oxed{22.22\ ext{meq/l}} \]