s. What is the molar solubility of lead()jiodide, Pbla in a solution containing

Question

s. What is the molar solubility of lead()jiodide, Pbla in a solution containing 0.100 M Nal? Ksp 7.1 x 10 (6 points) Pbl,(6)Pb (a)+21 (aq) 1. Predict whether each of the following processes involve an increase or a decrease in entropy. What is the sign (delta S) of entropy in each? (12 points) a) The decomposition of ammonium nitrate 2 NH4NO (s) 2N2(g) + 4 H0(g)+ 0:(g) Chapter 17 b) The extraction of sucrose sugar from cane sugar juice c) Conversion of SO2 to SOs, a key step in the manufacture of sulfuric acid, H2SO 2502(g) + O2(g) ? 2SO3(g)

Explanation / Answer

5) we have

Ksp = 7.1 x 10^-9

and for the reaction

.........................................PbI2 (s) <----------------> Pb2+ (aq) + 2 I- (aq)

initial conc. .................... - ............................... - 0.100 M

final conc. ....................... - ................................. X (0.100 + 2X)

therefore

Ksp = [Pb2+][I-]^2

or

7.1 x 10^-9 = X * ( 0.100 + 2 X )^2

where suppose X is too small then (0.100 + 2X) = 0.100 M

or

7.1 x 10^-9 = X * (0.100)^2

or

X = 7.1 x 10^-9 / ( 10^-2)

or

X = 7.1 x 10^-7 M

thus

molar solubility of lead(II) iodide = 7.1 x 10^-7 M

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