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Grade: 12

                        

Q. 15 What is the minimum concentration of SO 4 2- required to precipitate BaSO 4 in a solution containing 1.0 × 10 -4 mole of Ba 2+ ? K sp for BaSO 4 = 4 × 10 -10 . 1. 4 × 10 -10 M 2. 2 × 10 -7 M 3. 4 × 10 -6 M 4. 2 × 10 -3 M

11 years ago

Answers : (1)

Prasanjeet Mohanty Mohanty
37 Points
							

BaSO4 dissociates according to the following equation:

BaSO4---Ba2+ +SO42-.

as the concentration of barium ion is given, using the relation Ksp= [Ba2+]*[SO42-] we can find the concentration of SO42-

Hence the answer is 4*10-10/1*10-4=4*10-6

 

11 years ago
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