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10 December, 19:25

A sample of seawater contains 1.3g of calcium ions in 3,100kg of solution. what is the calcium ion concentration of this solution in units of ppm?

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  1. 10 December, 23:16
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    Unit ppm stands for parts per million. in terms of mass, ppm is equivalent to mg/kg.

    since 1 kg is 10⁻⁶ mg, 1 kg is equivalent to million mg.

    therefore mg/kg is also ppm.

    there are 1.3 g of Ca ions in 3100 kg

    if 3100 kg contains - 1.3 g of Ca

    then 1 kg contains - 1.3 g / 3100 kg

    then Ca ions - 0.42 x 10⁻³ g/kg

    Ca ion concentration - 0.42 mg/kg

    therefore Ca ion concentration is 0.42 ppm
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