- #1

sdoug041

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## Homework Statement

A sample of water is known to have 190 g/m^3 Ca2+ and 84 g/m^3 Mg2+. What is the hardness of the water in mg CaCO3/L?

## Homework Equations

Hardness = (Ca2+) + (Mg2+)

## The Attempt at a Solution

I need to convert my units into mg CaCO3/L or Normality before summing up the values. The problem is I do not understand how to convert to either.

If I'm converting to mg CaCO3/L do I need a molar mass? And when do I use it?

As for normality I do not understand what a "weight equivalence" is so I can't convert to that either.

Thanks a lot.