General Chemistry

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Sodium sulfate is slowly added to a solution containing 0.0500 M Ca2 (aq) and 0.0290 M Ag (aq). What will be the concentration of Ca2 (aq) when Ag2SO4(s) begins to precipitate?What percentage of the Ca2 (aq) can be separated from the Ag (aq) by selective precipitation?

  • General Chemistry -

    Do you have the corresponding Ksp values?

  • General Chemistry -

    CaSO4 Ksp= 4.93E^-5
    Ag2SO4 Ksp= 1.20E^-5

  • General Chemistry -

    Ag2SO4 will begin to ppt when
    Ksp = (Ag^+)^2(SO4^2-) is exceeded.
    (SO4^2-) = Ksp/(Ag^+)^2
    (SO4^2-) = Ksp/(0.290)^2
    Solve for SO4^2- and substitute into Ksp for CaSO4. Solve for Ca^2+

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