A small sample of pure Pbl_2(s) is shaken with distilled water to produce satura

Question

A small sample of pure Pbl_2(s) is shaken with distilled water to produce saturated solution. After centrifugation concentration of iodide in supernatant (saturated solution above the solid Pbl_2) is determined to be 5.0 middot 10^-3 M. Write the chemical equation describing heterogeneous equilibrium in saturated Pbl_2 solution, calculate the molarity of lead(II) ions, and determine K_sp of Pbl_2 at that temperature. Show all your work. Chemical equation: Calculations: Challenging question: Why is test tube 5 in your experiment treated differently from test tubes 1 - 4?

Explanation / Answer

[I-] --> 5*10^-3 M

PbI2(s) <--> Pb+2(aq) + 2I-(aq)

find molarity...

[PB+2] = 1/2[I-] = (1/2)*5*10^-3 = 10*10^-3 = 0.0025

so

Ksp = ([PB+2][I-2]^2)

Ksp = (0.0025)( 5*10^-3)^2 = 6.25*10^-8

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