Pertinent equation for solubility of Ba(OH)2 is given as,
Ba(OH)2 ---------------> Ba2+ (aq.) + 2 OH- (aq.).
Let solubility of Ba(OH)2 be 'S' mole/L hence on ionization ionic concentrations are given as,
[Ba2+] = S mole/L
[OH-] = 2S mole/L
Now solubility product Ksp has expresion as,
Ksp = [Ba2+][OH-]2.
Ksp = (S)(2S)2.
Ksp = S x 4S2.
Ksp = 4S3.
Ksp for Ba(OH)2 = 1.5 x 10-4.
Ksp = 4S3 = 1.5 x 10-4.
4S3 = 1.5 x 10-4.
S3 = 1.5 x 10-4 /4
S3 = 150 x 10-6 / 4
S3 = 37.5 x 10-6
S= 3.35 x 10-2 mole/L
Molar Solubility of Ba(OH)2 is 3.35 x 10-2 mole/L
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b) Solubility in g/L :
Molar mass of Ba(OH)2 = 171.34 g/mole
S = 3.35 x 10-2 mole/L
On multiplying by molar mass to molar solubility we get S in g/L unit.
S = 3.35 x 10-2 x Molar mass of Ba(OH)2 g/L
S = 3.35 x 10-2 x 171.34 g/L
S = 5.74 g/L
Solubility of Ba(OH)2 is 5.74 g/L.
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