A sodium chloride IV fluid contains 154 mEq of Na+ per liter of solution. If a patient receives exactly 500 mL of the IV, how many moles of Na are given?
An equivalent is described as an amount of substance that in an acid base reaction reacts with or supplies 1 mole of H+ ions or in a redox reaction supplies or reacts with 1 mole of electrons.
For Na+, as 1 mole of Na+ reacts with 1 mole of electrons in a redox reaction, one equivalent of Na+ is one mole of Na+.
The patient receives an IV fluid that contains 154 mEq of Na+ per liter of the solution and is given 500 mL of the solution.
The mEq of Na+ that the patient receives is 154*0.5 = 77 mEq.
77 mEq of Na+ is 77*10^-3 mole. The patient is given 77*10^-3 mole of Na+.