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15 October, 20:45

A patient requires an IV of 0.9% saline solution, also known as normal saline solution. How much distilled water, to the nearest milliliter, must be added to 100 milliliters of a 2% saline solution to produce normal saline?

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  1. 15 October, 21:05
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    Let the amount of proper amount of water to be added be x milliliters.

    the solution of 100 milliliters is 2% saline, means that 2%*100=2 milliliters of the original solution is saline.

    after we add x milliliters, the total volume of the liquid becomes 100+x (milliliters), and 2 milliliters is now 0.9% of the solution, that is:

    2 = 0.9% (100+x)

    2=0.9+0.009x

    0.009x=2-0.9

    0.009x=1.1

    x=1.1/0.009=122.2 (milliliters)

    Answer: 122.2 milliliters
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