Anthony needs to make a solution with a concentration of 2.5m. He begins with 2.0 iters and a 8.0M solution. What final volume does he need.

Question

Anthony needs to make a solution with a concentration of 2.5m. He begins with 2.0 iters and a 8.0M solution. What final volume does he need. Tally and solve.

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Hồng Cúc 6 months 2021-07-29T16:19:43+00:00 1 Answers 3 views 0

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    2021-07-29T16:20:46+00:00

    Answer:

    The final volume is 6.4 L.

    Explanation:

    Dilution is reducing the concentration of a chemical and is achieved by adding more solvent to the same amount of solute. In other words, dilution is the procedure that is followed to prepare a less concentrated solution from a more concentrated one, and it simply consists of adding more solvent.

    In a dilution the amount of solute does not vary, and as only more volume (and mass) of solvent is being added, the concentration of the solute decreases.

    In a dilution the expression is used:

    Ci*Vi = Cf*Vf

    where:

    • Ci: initial concentration
    • Vi: initial volume
    • Cf: final concentration
    • Vf: final volume

    In this case:

    • Ci: 8 M
    • Vi: 2 L
    • Cf: 2.5 M
    • Vf: ?

    Replacing:

    8 M* 2 L= 2.5 M* Vf

    Solving:

    Vf=\frac{8 M* 2 L}{2.5 M}

    Vf=6.4 L

    The final volume is 6.4 L.

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Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )