Diffusion Osmosis Practice Problems A U-tube is divided into 2 halves, side A and B, by a membrane which is permeable to water and salt, but NOT to glucose. Side A is filled with a solution of 8% salt and 2% glucose, while side B is filled with 2% salt and 8% glucose. a. At the start, which side of the U-tube is hypertonic, and which is hypotonic? Explain why based on the definitions of hyper and hypotonic. can you complete today?