PPT Slide

CaNa2EDTAsolid Ca2+ + Na+ + EDTA4-

EDTA4- Pb2+ EDTAPb2-

stoi 1 1 1

init 7.66x10-5 1.93 x10-6 0

change Kf = 1017.9 = 7.9x1017 = huge

reaction to right.

moles init. of EDTA = 3Lx7.66x10-5 =2.29x10-4

moles init of Pb = 3Lx 1.93 x10-6 = 5.79x10-6

Limiting reagent is Pb

moles remaining EDTA = 2.23x10-4

Conc. remaining = 2.23x10-4/3L = 7.44x10-5

Conc. Pb = 0; conc. PbEDTA = 1.93x10-6

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