(2)Most potassium salts, and most salts of the perrhenate anion (ReO4 ), are quite soluble. However, potassium perrhenate, KReO4, is only sparingly soluble, dissolving to the extent of 12.1 g/L at room temperature. (a) Calculate the Ksp of KReo4 A sample of water is saturated with KRe04 and then filtered to remove any undissolved solid. To 1.00 L of this solution is added 0.300 mol of solid potassium nitrite, KNO2, which is quite soluble (2810 g/L in pure water). After shaking this mixture for several minutes, there is some solid which persists no matter how much more the mixture is shaken. (You can assume that the volume of the solution remains 1.00 L.) (b) What is the identity of the solid? (c) Calculate the concentration of NO2 remaining in the solution.