A continuous gravity decanter is to separate chloro-benzene with a density of 1109 kg/m^3 from an aqueous wash liquid having a density of 1020 kg/m^3. If the total depth in the separator is 1m and the interface is to be 0.6 m from the vessel floor,
a. What should the height of the heavy-liquid outflow leg be?
b. How much would an error of 10mm in this height affect the position of the interface?