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26 October, 20:40

The titration of 80.0 mL of an unknown concentration H3PO4 solution requires 126 mL of 0.218 M KOH solution. What is the concentration of the H3PO4 solution (in M) ?

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  1. 26 October, 20:54
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    Ca = 0.1145M

    Explanation:

    Volume of Acid (Va) = 80.0ml

    Concentration of acid (Ca) = ?

    Volume of base (Vb) = 126ml

    Concentration of base (Cb) = 0.218M

    The balanced chemical equation is given as;

    3KOH + H3PO4 - -> K3PO4 + 3H2O

    The formular relaing the parameters is given as;

    (CaVa) / (CbVb) = Na/Nb

    Where Na = Number of moles of Acid = 1

    Nb = Number of moles of Base = 3

    Making Ca subject of interest;

    Ca = (Na * Cb * Vb) / (Nb * Va)

    Ca = (1 * 0.218 * 126) / (3 * 80)

    Ca = 27.468 / 240

    Ca = 0.1145M
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