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8. Consider the following reactions and assume the solution is buffered at all values and the activity of Zn(OH)2 and Fe(OH)3 is 1, respectively. K is the equilibrium constant of the reaction. The K value given below is for room temperature T=298K. Zn(OH)2Zn2++2OH,K=[Zn2+][OH]2=1.21017 OH)2Zn2++2OH,K=[Zn2][OH2=1.21017Zn(OH)2+2OHZn(OH)42+,K=4.61017Znfn (a) Calculate the equations of log[ ion] versus pH for Zn2+ and Zn(OH)42 ions respectively and sketch their behaviors. Indicate the slope of lines, soluble and insoluble regions. (6) (b) Calculate the pHmin value and the corresponding [Zn2+]min where the lowest [Zn(OH)2] can (c) Assuming G is independent of temperature, calculate the pHmin at any temperature. exist. (2)