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Quantum Mind
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Homework Statement
A sample of hard water contains 305 ppm of HCO3- ions. What is the minimum mass of CaO required to remove HCO3- completely from 1 kg of water sample?
Homework Equations
Ca 2+ + 2HCO3 + CaO = 2CaCO3 + H2O
The Attempt at a Solution
Since the HCO3- ions are 305 parts per million, it can be assumed that there are 0.305 g of the ions in 1 kg (or 1 L as the density is 1) of water. (I don't know if this assumption is correct)
If I use the equation as above, then I get 0.1525 g of CaO which is not correct.
I think that the whole trouble is with the ppm part. Can someone give me a clue?