Apharmacy technician added 10 ml of a 20% (w/v) solution of potassium chloride to a 500 ml bag of normal saline. what is the percentage strength of potassium chloride in the bag? round to the nearest hundreth. do not enter the percentage sign in your answer; enter only the number

To solve this we use the equation, 

M1V1 = M2V2

where M1 is the concentration of the stock solution, V1 is the volume of the stock solution, M2 is the concentration of the new solution and V2 is its volume.

M1V1 = M2V2

20% x 10mL = M2 x 510 mL

M2 = 0.39 %

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