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Questions  >>  JEEMAIN and NEET  >>  Chemistry  >>  Solutions
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How much $CaCO_3$ is present in 100ml of 1000ppm $CaCO_3$ solution?

$\begin{array}{1 1}(a)\;50mg\\(b)\;75mg\\(c)\;100mg\\(d)\;200mg\end{array}$

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A)
Answer: 100 mg.
Mass by volume percentage and parts per million are both and expression of concentration of a solution.
We are given ppm $= 1000\;ppm$ and Volume $= 100\;mL$
$\Rightarrow ppm = 1000 = \large\frac{\text{Mass}}{\text{volume}}$$ = \large\frac{\text{Mass}}{100\; mL}$
$\therefore \text{Mass} =100\;mg$
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