In the titration of 25.00 ml of a water sample, it took 19.240 ml of 3.960x10 -3
ID: 787995 • Letter: I
Question
In the titration of 25.00 ml of a water sample, it took 19.240 ml of 3.960x10-3 M EDTA solution to reach the endpoint.
The total hardness is always listed in parts-per-million (ppm) of CaCO3 (or mg CaCO3 / Kg H2O). Since the density of water is 1.0 g/ml, one ppm would be the same as the number of mg of CaCO3 per liter of water. Determine the number of moles of CaCO3 present in the titrated sample of water, assuming that all the Ca2+ combines with CO32?. (enter your answer with 3 significant figures)