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What is the concentration of a solution, in parts per billion, if 0.02 mg of NaCl...

What is the concentration of a solution, in parts per billion, if 0.02 mg of NaCl is dissolved in 1000 g of solution? 0.02 ppb, 2 ppb, 20 ppb, or 200 ppb? And WHY?

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Answer #1

Parts per billion is mathematically calculated as the (mass ratio of solute to the solution)*().

Here the mass of NaCl given is 0.02mg = 0.02*() g

Therefore the parts per billion (or ppb) = = 20 ppb.

Since the mass of NaCl is in mg and that has to be converted to g (by multiplying the mass with , the ppb concentration is 20 ppb. If the solute mass has been given as 0.02 g instead of 0.02 mg, then ppb would have been 20000 ppb.

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