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2 May, 19:16

If you add 25.0 mL of water to 125 mL of a 0.150 M LiOH solution, what will be the molarity of the resulting diluted solution?

0.0450 M LiOH

0.0647 M LiOH

0.125 M LiOH

0.134 M LiOH

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  1. 2 May, 20:52
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    Concentration is the number of moles of solute in a fixed volume of solution

    Concentration (c) = number of moles of solute (n) / volume of solution (v)

    25.0 mL of water is added to 125 mL of a 0.150 M LiOH solution and solution becomes more diluted.

    original solution molarity - 0.150 M

    number of moles of LiOH in 1 L - 0.150 mol

    number of LiOH moles in 0.125 L - 0.150 mol / L x 0.125 L = 0.01875 mol

    when 25.0 mL is added the number of moles of LiOH will remain constant but volume of the solution increases

    new volume - 125 mL + 25 mL = 150 mL

    therefore new molarity is

    c = 0.01875 mol / 0.150 L = 0.125 M

    answer is 0.125 M
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