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For BaSO4(s) ⇌ Ba2+ + SO4^2-, the solubility product Ksp equals:
A[BaSO4] alone
B[Ba2+] + [SO42-]
C[Ba2+] / [SO42-]
D[Ba2+][SO42-]
Answer & Solution
Correct answer: D. [Ba2+][SO42-]
The solid's concentration is constant and folds into K, leaving the product of the ion concentrations.
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