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13 August, 17:50

An aqueous solution has a mass of 490 grams containing 8.5 * 10-3 gram of calcium ions. The concentration of calcium ions in this solution is

1. 4.3 ppm

2. 8.5 ppm

3. 17 ppm

4. 34 ppm

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  1. 13 August, 18:10
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    To solve the concentration, it is equal to the mass of the calcium ions divided by the total mass of the solution.

    C = mass of ions / mass solution

    C = (8.5 x 10 ^-3 g) / 490 g

    C = 1.7 x 10^-5

    since the choices are in ppm, multiply it by 10^6

    C = (1.7 x 10^-5) 10^6

    C = 17 ppm
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