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18 August, 10:33

suppose 100ml of perchloric acid is neutralized by exacly 46.9 ml of 0.75m lithium hydroxide. what is the concentration of the perchloric acid?

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  1. 18 August, 10:39
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    0.352M

    Explanation:

    First, we need to write a balanced equation for the reaction between perchloric acid and lithium hydroxide. This is shown below:

    HClO4 + LiOH - > LiClO4 + H2O

    From the balanced equation above, we obtained:

    nA (mole of the acid) = 1

    nB (mole of the base) = 1

    Data obtained from the question include:

    Va (volume of the acid) = 100mL

    Ca (concentration of the acid) = ?

    Vb (volume of the base) = 46.9 mL

    Cb (concentration of the base) = 0.75M

    Using CaVa/CbVb = nA/nB, the concentration of the acid can obtained as follow:

    CaVa/CbVb = nA/nB

    Ca x 100 / 0.75 x 46.9 = 1

    Cross multiply to express in linear form

    Ca x 100 = 0.75 x 46.9

    Divide both side by 100

    Ca = (0.75 x 46.9) / 100

    Ca = 0.352M

    Therefore the concentration of the acid is 0.352M
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