What must be the concentration of PO4 3− to just start precipitation of Ag3PO4 in a 0.10 M AgNO3 solution?

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  • Bobby
    Lv 7
    2 months ago

    The Ksp for Ag3PO4 is 1.8 x 10-18

    Ksp = [Ag+]^3 ^ [PO43-]

    1.8 x 10-18 = 0.10 ^3 * [PO4 3-]

    [PO4 3-] = 1.8* 10^-18 / 0.1 ^3 = 1.8 * 10^-15 moles/ liter

    any additional PO4 3- will give the silver precipitate

  • 2 months ago

    It depends on the temperature and the Ksp of Ag3PO4 at that temperature.

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