[kirk]

A solution of edta has a concentratin of 4.60x10^-3 M. How many moles of EDTA per liter and how many moles in 20.15 mL?


A water sample is found to be 0.0048 mol/L CaCO3. Calculate the water hardness is ppl (mg/L) of the sample. Would this sample be classes as soft, moderatly hard, hard or very hard water?

[macman104]

Show what your attempts to solve this problem have been.

Some question to get you along your way:

What is the unit of Molarity?
What is the molecular weight of CaCO₃?
What ranges define whether the water is soft, moderately hard, hard, or very hard?

I'm sure some of these answers are in the chapter these questions relate to.  If not, I'm fairly confident the information (at least the units of Molarity and the molecular weight) are able to be found with a simple google search.

[kirk]

thankss!