Answer to Question #66129 in General Chemistry for ali

Question

a painter is cleaning her paintbrush with solvent. The mass of the brush fibers is 250 g and the fibers have 50 g of paint on them. The brush will be immersed in solvent and agitated until equilibrium conditions are established. A Freundlich isotherm applies with Kf = 0.90 and n = 3.14 for q in mg/g and C in mg/L. a) Find the mass of paint remaining on the brush if it is immersed in a solvent volume of 1.0 L. Find the total volume of solvent required to achieve the same degree of cleansing as in a) if two equal volumes of solvent will be used in succession. The brush is immersed in the first volume and agitated until equilibrium is established, removed and the exercise is repeated with the second volume. Assume that the solvent remaining in the brush after it is removed from the first batch is insignificant.