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Inlet 4.(30 pts) The well-stirred tank of volume V = 2 m3 is initially filled with brine, in which the initial concentration of sodium chloride at t = 0) is co = 1 kg/m3. A flow rate of Q = 0.01 m3/s of pure water is fed steadily to the tank, and the same flow rate of brine leaves the tank through a drain. (a) Derive an expression for the subsequent concentration of sodium chloride c in terms of Co, t, Q, and V. (b) Make a sketch of c versus t. (c) How long will it take for the concentration of sodium chloride to fall to a final value of Cf = 0.0001 kg/m3? Stirred tank Outlet