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29 March, 04:02

How many mL of a stock 50% (w/v) KNO3 solution are needed to prepare 250 mL of a 20% (w/v) KNO3 solution?

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  1. 29 March, 04:49
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    100ml of a stock 50% KNO3 solutions are needed to prepare 250ml of a 20% KNO3 solution.

    Explanation:

    In the given question it is mentioned that

    S1=50%

    V2=250ml

    S2 = 20%

    We all know that

    V1S1=V2S2

    ∴V1 = V2*S2:S1

    ∴V1 = V2S2*1/S1

    ∴V1 = 250*20:50

    ∴V1 = 100ml
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