C. The total hardness of any natural sample is reported in terms of the mg of CaCO3 that would have to dissolve in one liter of water to give that same result. Consider the following data: “30.0 mL of water from river YY required 12.35 mL of 0.0114 M EDTA to titrate it to the end-point using the procedure in Section II.”
Calculate the total hardness of river YY in units of mg/L of CaCO3. Show your calculation and list any assumptions you had to make.

D. List at least two instances in which the use of water with a high hardness level would be disadvantageous. List one instance in which it might-be advantageous. Briefly explain your reasoning in each case.

What do YOU think ?
While we're happy to HELP we won't do all the work for you.
Show us what you have done and where you are having problems..