Which one of the salts below is least soluble at 25oC? Group of answer choices MnS,...

Which one of the salts below is least soluble at 25^oC?

Group of answer choices

MnS, K_sp = 2.3x10^-13

PbCO₃, K_sp = 1.5x10^-15

AgCN, K_sp = 1.2x10^-16

SrCO₃, K_sp = 7.0x10^-10

Expert Solution

Solubility Product " Ksp "is used for salts which are less soluble. In such salts there exists an equilibrium between the concentration of the solid salt and the concentration of the dissolved ions of the corresponding salt in the solvent. The solubity product constant or solubility product Ksp represents this equilibrium between the solid and dissolved salt.

For a salt AB dissolved into A+ & B- ;
Ksp = [A+][B-] / [AB] ; since [AB] = 1 since AB is solid,
Ksp = [A+][B-].

Thus higher the concentrations of ions A+ & B- , higher the Ksp, that means solubilty is greater for salts having higher Ksp.

Here in the above question SrCO3 has the greatest Ksp of 7.0 x thus SrCO3 has the greatest solubility.

queen_honey_blossom answered 2 years ago

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