Engineering Board Exam Reviewer · Chemistry · hard

The molar solubility of a salt MX2 is 1 × 10-4 M. What is its K sp?

  1. 1.0 × 10-8
  2. 4.0 × 10-12
  3. 2.0 × 10-12
  4. 1.0 × 10-12

Answer

B. 4.0 × 10-12

Solution

MX2 M2+ + 2X-: K sp = s(2s)2 = 4s3 = 4(10-4)3 = 4.0 × 10-12.

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