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The Ksp for Hg2Br2 is 1.2 ? 10-18. Calculate [ Hg22+ ] in saturated solutions of Hg2Br2 in 0.001 M KBr.

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(1) calculate ionic strength and the mean ionic activity coefficient.

mz logy, = -0.509|242. 11

(2) calculate m+ from ksp and mean ionic activity coefficient.

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