Practice: Calculate mass (grams) needed for the following ion equivalent: 1.5 mEq of Na+ ions.
Equivalents are used to measure individual ion amount present in body fluids and intravenous solutions.
Equivalents (Eq)
Concept #1: Equivalent equals to 1 mol of positive or negative charge.
Example #1: Calculate number of Equivalents in each of the following:
a) 1 mole of Ca2+ b) 2 moles of PO43-
Concept #2: Normality
Example #2: Calculate the Normality of 0.35 mole of Mg2+ ions present in a 300 mL of blood.
Practice: The concentration of Cl- ion in blood is approximately 105 mEq/L. How many milliliters of blood would be needed to obtain 1.4 g of Cl- ions?
Practice: An intravenous saline solution contains 140 mEq/L of Na+. How many mEq of Na+ are present in 750 mL of the solution?
Practice: Calculate the normality (mEq/L) of potassium ions in a 500 mL Ringer’s solution that is 2.0 x 10-3 M in potassium ions.
