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40% (wt./vol.) NaCl has specific gravity 1.12 g/mL. In ppm the concentration of NaCl is

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3.57 × 10⁶ ppm

1 × 10⁶ ppm

5.5 × 10⁵ ppm

4 × 10⁵ ppm

answer is A.

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Detailed Solution

100 mL solution = 100 × 1.12 g solution = 112 g solution

That is, 72 g H₂O has 40 g NaCl

$∴ \frac{40}{72} \times 10^{6} = 5.5 \times 10^{5} ppm$

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