a) Calculate the amount of free Cd2+ in equilibrium with CdSR+ in a ditch that’s located by a newly fertilized arable land if the total concentration of RS- and Cd2+ before equilibrium was 0.002 and 10-7 M respectively. The equilibrium constant for the reaction Cd2+ + RS- = CdSR+ is 1011.

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b) What happens to the equilibrium constant of Cd2+ if the pH-value increases to 8.2 in conjunction with liming? The pKa-value for RSH is 9.0. Explain your answer.