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Chemistry

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An aqueous solution contains 0.216 M ascorbic acid (H2C6H6O6) and 0.131 M hydrochloric acid.

Calculate the ascorbate (C6H6O62-) ion concentration in this solution.

[C6H6O62-] =______________ mol/L.

  • Chemistry -

    Ascorbic acid = HAsc
    .........HAsc ==> H^+ + Asc^-
    initial.0.216.....0......0
    change....-x.......x......x
    equil..0.216-x.....x.......x

    ..........HCl ==>H^+ + Cl^-
    initial...0.131..0......0
    change...-0.131..0.131..0.131
    equiol....0......0.131..0.131

    Write the Ka expression for HAsc
    K = (H^+)(Asc^-)/(HAsc)
    For (H^+) substitute x + 0.131 (x from the HAsc equil + 0.131 from the HCl equil).
    For (Asc^-) substitute x
    For (HAsc) substitute 0.216-x
    Solve for x.

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