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26 September, 15:49

5)

A student is conducting a lab that requires 2 M HCl. In the chemical closet, there is 150 mL of 8 M HCl. How much water must be added to stock solution to get the desired molarity for the lab?

A) 150 mL

B) 450 mL

C) 600 mL

D) 1200 mL

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Answers (1)
  1. 26 September, 15:57
    0
    Option B. 450mL

    Explanation:

    To obtain the volume of water that must be added, we need to First find the volume of the diluted solution.

    C1 (concentration of the stock solution) = 8M

    V1 (volume of the stock solution) = 150mL

    C2 (concentration of the diluted solution) = 2M

    V2 (volume of the diluted solution) = ?

    Using the dilution formula C1V1 = C2V2, we can obtain the volume of the diluted solution as follow:

    C1V1 = C2V2

    8 x 150 = 2 x V2

    Divide both side by 2

    V2 = (8 x 150) / 2

    V2 = 600mL

    The volume of water added is simply the difference between the volume of the diluted solution and that of the stock solution. This is illustrated below

    Volume of water added = V2 - V1 = 600 - 150 = 450mL
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