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chemistry

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A solution is saturated with Ag2CrO4. a) Calculate [CrO4^2-] in this saturated solution. b) What mass of AgNO3 must be added to 0.635 L of the solution to reduce [CrO4^2-] to 1.0* 10^-8M?

  • chemistry - ,

    Let x = solubility Ag2CrO4
    Ag2CrO4(s) ==> 2Ag^+ + CrO4^2-
    .....x..........2x.......x

    Ksp = (Ag^+)^2(CrO4^2-)
    Substitute from the chart above and solve for x

    b.
    Use the same Ksp expression. Substitute what you want CrO4^2- to be an solve for (Ag^+). That will give you Ag^+ in moles/L. Convert to moles in 0.635 L, then g AgNO3 = moles x molar mass AgNO3.

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