Group 2: Alkaline earth metals
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I am investigating hardness in water - total hardness, temporary, permanent, and also Mg and Ca in a water sample. I've worked out the concentrations in mol dm-3 but when I've been researching it seems that I've got to show it in ppm CaCO3. How do I convert mol dm-3 into ppm?
210208
Corrie writes ....
Yes, hardness is often given in ppm, so it is not a bad idea to convert your results to ppm, for comparison purposes.
Therefore 1 ppm (part per million) of CaCO3 would be 0.001 g CaCO3 in 1000 cm3 of solution (take as water, 1000 g). As 1 mole of CaCO3 has a mass of 100 g, this corresponds to a concentration of
0.001/100 mol dm-3 = 0.00001 mol dm-3.
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updated: 21 February 2008
