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11 June, 06:00

There are 2.2 mg of lead in exactly 500 g of a water sample. What would the concentration of lead be in parts per million? Round to the nearest tenth. Don't forget the units.

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  1. 11 June, 07:27
    0
    Ppm is parts per million. concentration of a solution can be expressed in parts per million, this is equivalent to mg/L.

    therefore concentration in ppm is how many mg have been dissolved in 1 L of solution.

    There are 2.2 mg of Pb in 0.5 L solution Therefore in 1 L of solution - 2.2 / 0.5 x 1 = 4.4 mg/L

    Therefore concentration is 4.4 ppm
  2. 11 June, 07:54
    0
    I believe the answer is 4.4 ppm
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