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Solution exchange equation: dx/dt = -(k/V) . x Whose solution is: X(t) = Xf - (Xf - Xi) . exp(-(k/V) . t) Equation describing the time course of a solution exchange when V is a constant volume and k a constant flow rate of a solution of concentration Xf exchanging for solution of concentration Xi. Solving for t gives the time it takes to go from concentration Xi to Xf |
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