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14 November, 15:32

A pharmacist has a prescription for 30 ml of an eye drop that is to contain benzalkonium chloride 1:750 as a preservative. on the shelf the pharmacist finds 17% benzalkonium chloride. using a dropper that delivers 25 drops/ml, how many drops will be required to prepare this compounded formula? (answer must be numeric; no units or commas; round the final answer to the nearest whole number.)

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  1. 14 November, 15:41
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    Let the volume of the 17% solution added be x.

    The final volume will be 30 ml with a concentration of 1/750.

    The amount of benzalkonium present will remain constant, and is the same in the final solution as in the pharmacists solution. Considering that:

    moles = concentration * volume

    C₁V₁ = C₂V₂

    0.17 * x = 1/750 * 30

    x = 0.24 ml

    The number of drops that will be added are:

    25 * 0.24 = 6

    6 drops will be added by the pharmacist.
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