Millis (Equivalents and Moles)

Basics 1 mole of anything = atomic, formula, or molecular weight in grams –1 mole of Na + (atomic weight 23) = 23 grams –1 mole of CaCl 2 (Ca=40, Cl=35.5 X 2) = 111 grams 1 milliequivalent (mEq)= 1/1000 Eq 1 millimole (mmol) = 1/1000 mol 1 mEq = 1 mmol/valence

Basics Equivalent (Eq) weight = molecular weight/valence Equivalents = # moles X valence Valence = charge –K +, Na +, PO 4 -, or Cl - = 1 –Ca 2+ = 2 Eq weight of Na + = 23/1 = 23 grams –1 Eq of Na + = 1 mole of Na + Eq weight of Ca 2+ = 40/2 = 20 grams –2 Eq of Ca 2+ = 1 mole of Ca 2+

Example How many mEq are in 117 mg of NaCl Cl = 35.5, Na = 23 = 2 mEq of Na +, 2 mEq of Cl -, 2 mEq of NaCl.

Example How many mEq of potassium are in 1500 mg of KCl? K + = 39.1 g, Cl - = 35.5 g

Same problem different way to calculate We have 1500 mg KCl FW = 74.6 g

How many mEq of NaCl needs to be added to 250 mL of water to make half normal saline?