In another experiment to determine the Ksp of the salt AB2, 500.0 mL of 0.100 M A2 was added to 500.0 mL of 0.205 M B-. After the precipitate settled, a portion of the supernatant liquid was filtered and analyzed and found to contain 2.3 x 10⁻⁷ M A2. Calculate the Ksp.