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A 25.0 mL sample of waste water is obtai...

A `25.0 mL` sample of waste water is obtained to analyze for `Pb^(2+)` ions. This sample is evaporated to dryness and redissolved in `2.0 mL` of `H_(2)O`, mixed with `2.0 mL` of a buffer solution and `2.0 mL` of a solution of dithizone then diluted to `10.0 mL`. The absorbance of the coloured `Pb^(2+)` dithizone complex is compared with the Beer-Lambert plot below. The absorbance of a proton of the final solution is `0.13`. What is the concentration of `Pb^(2+)` ions in the waste water in ppm ?

A

`2.9`

B

`7.2`

C

18

D

36

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The correct Answer is:
A
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