Question

Highland Spring Mineral water contains 0.133g of hydrogencarbornate per cubic decimeter.What is the concentration of hydrogencarbonate in parts per million

Answer 1

This is equivalent to 0.113g/l. One litre is almost exactly 1000g so if you multiply both top and bottom by 1000 you get 113 parts of HCO3 in 1000000 parts of solution. I hope this is clear