[Boomer]

Jon

The valence is critical when dealing with ions with a charge of more than 1.

I mol with a valence of 1 = 1 meq / l

1 mol with a valence of 2 = 2 meq / l

1 mol with a valence of 4 = 4 Meq /l

10 mmol of Ca++ = 20 meq /l Ca++

1 mmol of HCO3- = 1 meq / l

1 mmol of CO3-- = 2 meq / l

Mol / L x MW = ppm or mg / l

It all depends on what your are calculating

If your sample contains 30 mg Ca/L, what is the concentration in meq/L?

Mol / L x MW = ppm or mg / l

So, 30 ppm / 40 MW = .75 mmol

.75 mmol x its charge of 2 = 1.5 meq/ l

In this hobby the only thing we use in meq/ l is Alk. So forget about everything else unless you have a reason for it.