The Ksp value for bismuth sulfide (Bi2S3) is 2.0 × 10-40 at a given temperature, calculate...

The Ksp value for bismuth sulfide (Bi2S3) is 2.0 × 10-40 at a given temperature, calculate the solubility in g/L

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Expert Solution

Bi2S3 -------------------> 2Bi^3+ (aq) + 3S^2- (aq)

2s 3s

Ksp = [Bi^3+]^2[S^2-]^3

2*10^-40 = (2s)^2*(3s)^3

2*10^-40 = 4s^2*27s^3

2*10^-40 = 108s^5

s^5 = 0.0185*10^-40

s = 0.45*10^-8

s = 4.5*10^-9M

solubility = 4.5*10^-9 mole/L

molar mass of Bi2S3 = 514.15g/mole

solubility = 4.5*10^-9 mole/L * 514.15g/mole

= 2.3*10^-6 g/L >>>>answer

queen_honey_blossom answered 1 year ago

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