mEq/L of Ca2+?

Question

How would you slove/setup this problem? Calcium is normally present in plasma at a concentration of about .1g/l. Calculate the mEq/L of Ca2+ in the plasma. The atomic weight of ca is 40

Answer 1

First convert the g/L into molarity (mole/L) by dividing with the Atomic weight

M= 0.1/40= 2.5*10^-3 mole/L =2.5 mmole/L

N=aM ( or Eq=a*mole if you prefer) and in this case a=2 (Ca+2 has charge +2)
so N=2*2.5=5 mEq/L