A patient needs to be given exactly 1000 mL of a 5.0% (w/v) intravenous glucose

Question

A patient needs to be given exactly 1000 mL of a 5.0% (w/v) intravenous glucose solution. The stock solution Is 65% (w/v). How many milliliters of the stock solution are needed to prepare the fluid for the IV bag? Which equation will determine how much water is needed to prepare the 5.0% (w/v) glucose solution? Volume of stock solution needed + volume given to patient (1000 mL) Volume given to patient (1000 mL)/volume of stock solution needed volume given to patient (1000 mL) - volume of stock solution needed Volume of stock needed/volume given to patient (1000 mL)

Explanation / Answer

Here

V1N1 = V2 N2

V1 = 1000 ml

N1 = 5%

V2 = ?

N2 = 65%

V2 = (1000 x 5) /65 = 76.9 ml

so the volume of stock sloution required = 76.9 ml

Volume of water required to prepare 5% glucose solution = 1000-76.9 = 923.1 ml water

so the answer is option 3, that is

Volume given to the patient( 1000 ml) - volume of stock solution needed

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