14. What volume (mL) of water do I need to add to 425 mL of a 1.8 M KCl solution to make a 1.2 M solution? How many moles of KCl

Question

14. What volume (mL) of water do I need to add to 425
mL of a 1.8 M KCl solution to make a 1.2 M solution?
How many moles of KCl are in the original solution
and how many moles of KCl are in the diluted solution?

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Cherry 4 years 2021-07-30T08:21:39+00:00 1 Answers 23 views 0

Answers ( )

  1. phucdien
    0
    2021-07-30T08:22:42+00:00
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    Answer:

    212.5 mL

    both the original and the diluted solution have 0.765 moles of KCl

    Explanation:

    c1V1 = c2V2

    V2 = c1V1/c2 = (1.8 M×425 mL)/1.2 M = 637.5 mL

    (637.5 – 425) mL = 212.5 mL

    n = (1.8 mol/L)(0.425 L) = 0.765 moles of KCl

    since it’s a dilution, the diluted solution has the same number of moles as the original solution, 0.765 moles of KCl

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