Introduction to Solubility Equilibria

AP Chemistry· difficulty 3/5

The Ksp values above are tabulated at 25 C in pure water.

Salt Ksp AgCl 1.8e-10 AgBr 5.0e-13 AgI 8.5e-17 PbI2 7.1e-9

Which silver halide is least soluble in pure water?

  • A

    All have equal molar solubility

  • B

    AgI

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  • C

    AgBr

  • D

    AgCl

Explanation

Among the 1:1 salts (AgX), the smallest Ksp gives the smallest molar solubility. AgI has Ksp = 8.5e-17, the smallest.

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