136. Задачка по химии №013 655

How many moles of potassium bromide must be added to 1 dm3 of a 2*10-6 M solution of Hg[CIO4]2 in order to reduce the concentration of the Hg - ion to 10-12 mol/dm3? Knest [HgBr4] 2- = 1.7 * 10-6.

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