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A generic salt, AB2AB2, has a molar mass of 313313 g/mol and a solubility of 1.201.20...

A generic salt, AB2AB2, has a molar mass of 313313 g/mol and a solubility of 1.201.20 g/L at 25 °C.

AB2(s)↽−−⇀A2+(aq)+2B−(aq)AB2(s)↽−−⇀A2+(aq)+2B−(aq)

What is the ?spKsp of this salt at 25 °C?

?sp=

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Answer #1

The solubility of salt is 1.20 g/L at 25°C

The molar mass of salt (AB2) = 313 g/mol

The solubility of salt in mol/L unit = (The solubility of AB2 in g/L)/(molar mass of AB2)

Solubility of salt in mol/L = (1.20 g/L)/(313 g/mol)

= 3.83×10-3 mol/L

The solubility of AB2 salt is 3.83×10-3 M.

AB2(s) <==> A+2(aq) + 2B-(aq)

- s 2s

Where s is the solubility of salt.

s = 3.83×10-3 M

Ksp = [A+2][B-]2

Ksp = (s)(2s)2

Ksp = 4s3

Ksp = 4×(3.83×10-3)3

Ksp = 224.7×10-9

Ksp = 2.247×10-7

( Ksp of this salt at 25°C is 2.247×10-7 )

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