To determine the Ksp value of Hg2I2, a solid sample is used, in which some of the iodine is present as radioactive I-131. The count rate of the sample is 5.0 × 1011 counts per minute per mole of I. An excess amount of Hg2I2(s) is placed in some water, and the solid is allowed to come to equilibrium with its respective ions. A 150.0-mL sample of the saturated solution is withdrawn and the radioactivity measured at 33 counts per minute. From this information, calculate the Ksp value for Hg2I2.
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