1.0 gm of CaCO3 was dissolved in HCl and the solution made up to 1000

1.	1.0 gm of CaCO3 was dissolved in HCl and the solution made up to 1000 ml with distilled water. 50 ml of the solution required 45 ml of EDTA solution for titration. 50 ml of hard water sample required 28 ml of EDTA and after boiling and filtering required 15 ml of EDTA solution. Calculate the hardness of water.
Answer» ANSWER: EXPLANATION: I couldn't able to UNDERSTAND your question

1.0 gm of CaCO3 was dissolved in HCl and the solution made up to 1000 ml with distilled water. 50 ml of the solution required 45 ml of EDTA solution for titration. 50 ml of hard water sample required 28 ml of EDTA and after boiling and filtering required 15 ml of EDTA solution. Calculate the hardness of water.

Answer»

I couldn't able to UNDERSTAND your question