Question

A generic salt, AB 2 , has a molar mass of 289 g/mol and a solubility of 7.20 g/L at 25 °C. AB 2 (s) − ⇀ ↽ − A 2 + (aq) + 2 B − (aq) AB 2 (s) ↽ − − ⇀ A 2 + (aq) + 2 B − (aq) What is the K sp K sp of this salt at 25 °C?

Answer 1

Salt AB2 Alt (aq) + 2BC) (aq-) -- - ABZ (3) Spa 25 where s is molar solubility 8 = number g moles volume of solution in L solubility = 7.20 914 molar mass = 289 g/mol 8 = solubility - 7.20 g/L = 0.025 mol/l molar mass 289 g/mol Ksp = [ A2+ ] [ 8-] = 's (28) 2 453 = 4(0.025) = 6.25 x 10-5 i Ksp of this salt is 6.25 x 10-5

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