The experimental data given below are the instantaneous concentration of solute S, which is to be washed out of a filter cake as a function of W, the wash ratio (volume of wash liquid/volume of liquid in the cake), and S_o, the initial solute concentration prior to washing. What is the fractional recovery of solute for W = 1 and 2?

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S/So W 1.0 0 1.0 0.2 0.9 0.4 0.80 0.6 0.7 0.8 0.9 0.55 0.43 1.0 0.23 1.2 0.15 1.4 0.1 1.6 0.04 1.8 0.02 2.0 0.1 1.6 0.04 1.8 0.02 2.0