Ksp problem

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George
Posts:17
Joined:Mon Feb 20, 2017 8:53 am
Ksp problem

Post by George » Thu Mar 09, 2017 10:54 am

How many mL of HCl 0.3M I must add to 5 mL di Pb(NO3)2 0.3M to start the precipitation of PbCl2, knowing that its Ksp is 1.62·10-5?

From Ksp formula

Ksp=[Pb2+]⋅[Cl−]2
Ksp=[Pb2+]⋅[Cl−]2

S=Ksp4−−−−√3=1.59⋅10−2
S=Ksp43=1.59⋅10−2


S is the concentration of ions in mol/L above which begins the formation of the precipitate. Knowing this, what should I do?

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