The solutions in the two arms of this u-tube are separated by a membrane that is permeable to water and glucose but not to sucrose. side a is half-filled with a solution of 2 m sucrose and 1 m glucose. side b is half-filled with 1 m sucrose and 2 m glucose. initially, the liquid levels on both sides are equal. initially, in terms of tonicity, the solution in side a with respect to that in side b is