The concentration of [tex]NaCl[/tex] solute particles in water will provide an isotonic eyedrop solution is 0.9% w/v
The isotonic solution is calculated by multiply the quantity of each drug in the prescription by its sodium chloride equivalent E , and subtract this value from the concentration of sodium chloride which is isotonic with body fluids . For a solution to be termed isotonic ( equal tone ) it must have the same osmotic pressure as a specific bodily fluid.
Example : The concentration of [tex]NaCl[/tex] solute particles in water will provide an isotonic eyedrop solution is 0.9% w/v
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