If 1000g of a water sample contains 10g of CaCO3 then the hardness of that water sample is
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To calculate this you'll need this:
500mg = 0.5g
1L water = 1000mL = 1000g (Density of water is 1g/1mL)
(0.5g CaCO3/1000g water + 0.5g CaCO3) x 1,000,000 = 500ppm
Think about 1mg of solute dissolved in 1 kg of solvent.
This would be 0.001g/1000g = 1ppm
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