An ionic compound with the molecular formula M3X has a molar mass of 136.8 g/mol

Question

An ionic compound with the molecular formula M3X has a molar mass of 136.8 g/mol and a solubility of 5.07 x 10-2 g/L. What is the molar solubility of the dissolved compound? The molar solubility of M3X is______M What is the molar concentration of the positive ions (M+) in the saturated solution of the compound? The molar concentration of the M+ ions is________M What is the molar concentration of the negative ions (X3-) in the saturated solution of the compound? The molar concentration of the X3- ions is________M What is the solubility product constant, Ksp, for this compound? The Ksp for this compound is__________

Explanation / Answer

Molar solubility = 5.07x10^ -2/136.8 = 3.7 x10^ -4 M

[M+] =3x 3.7 x10^ -4 = 1.11 x10^ -3 M ,

[X3-] = 3.7 x10^ -4 M,

Ksp = [M+]^3[X3-] = (1.11 x10^ -3)^3 (3.7x10^ -4) = 5.085 x10^ -13

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