Question

, where s is the molar The solubility product for a slightly soluble salt with the formula MX3 is written as solubility. Оа Ка-2 Oь. Кар - 3,2 Ос. Кър - 43 Od. Кар - 344 Оe. Kр - 274

Answer 1

Consider the reaction,

MX​​​​​3(s) <--------> M​​​​​​3+(aq) + 3X​​​​​​-​(aq)

Hence Ksp = [M​​​​​​3+(aq)] [X​​​​​​-(aq)]3

As [X​​​​​​-​(aq)] = 3[M​​​​​​3+(aq)]

Hence Ksp = [M​​​​​​3+(aq)] {3[X​​​​​​-​​​(aq)]}3

= [M​​​​​​3+(aq) ] x 33 x [X​​​​​​- (aq) ]3

Ksp =27[M​​​​​​3+(aq)]4

As molar solubility is s then [M​​​​​​3+(aq)] = s

Hence Ksp = 27s4

Hence option e is correct.