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29 July, 13:25

Nitrate is a common contaminant coming from run off from fertilizer use, leaking from septic tanks and sewage; and erosion of natural deposits. The maximum contaminant level (MCL) of nitrate (measured as Nitrogen) is 10.0mg/L in drinking water. Express this MCLin terms of (a) ppm, (b) ppb, and (c) moles/m3.

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  1. 29 July, 14:42
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    A. 10 ppm

    B. 10000 ppb

    C. 0.714 mol/m3

    Explanation:

    A.

    Parts Per Million is defined as 1 milligram mass of solute per 1 liter of solvent.

    Nitrate concentration (as Nitrogen) = 10 mg/L

    In ppm,

    10 ppm.

    B.

    Converting Parts Per Million (ppm) to Parts Per Billion (ppb),

    1 ppm is equal to 1000 ppb.

    10 ppm = (1000*10) ppb

    = 10000 ppb

    C.

    Molar mass of nitrogen = 14 g/mol

    Molar concentration = mass concentration/molar mass

    Mass concentration in g/m3,

    1 liter = 0.001 m3

    = 10 mg/l * 1l/0.001 m3

    = 10000 mg/m3

    mg to g,

    1000 mg = 1 g

    = 10000 mg/m3 * 1g/1000mg

    = 10 g/m3

    Molar concentration = 10/14

    = 0.714 mol/m3
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