Osmosis Practice: 1. Use the following diagram to answer questions a, b and c below. Beaker A Beaker B Beaker C 0 % Sugar __10__% Sugar 40% Sugar 100. Water 90% Water __60__% Water a) What is the solute concentration of Beaker A? 0% b) What is the solute concentration of Beaker B? 10% c) What is the solvent concentration of Beaker C? 60% Cell: 2. The diagram to the right depicts a cell submerged in a solution. The cell membrane is permeable to water but not to sugar. Start by completing the % concentrations of the intracellular and extracellular fluids. 30% Sugar 70% Water Solution: a) Is the cytosol hypotonic, hypertonic or isotonic? hypertonic 60% Sugar 40% Water b) In what direction is water going to move? (into the cell or out of the cell?)out of the cell c) Predict: What is going to happen to the size(mass) of the cell? The cell will shink d) Predict: What is going to happen to the extracellular solute concentration? It will go down 3.You prepare three bags containing different sucrose solutions (A = 15%, B = 30%, C = 65% sucrose). After weighing the bags you record their masses in the table. You then place your bags in beakers, all containing the same unknown concentration of sucrose and let them sit for one hour. Every 15 minutes you take the bags out and record their masses (Table 1). 1 Table 1: Mass (g) of bags A, B, and C over time (min). Time (min) Mass of A (g) Mass of B (g) Mass of C (g) 0 12.4 11.6 12.1 15 10.4 11.2 12.9 30 9.1 10.9 13.8 45 7.7 10.4 14.7 60 6.2 10 15.9 What is the tonicity of the unknown solution compared to bag A, bag B, and bag C, respectively? Justify your answer. (For each bag, use the sentence structure: The unknown solution is __________-tonic compared to Bag ___, because the mass ________________ (increased or decreased) indicating that water flowed ______________________________________ (describe the direction of osmosis).) A: The unknown solution is hypertonic compared to Bag A, because the mass decreased indicating that water flowed out of the bag. B: The unknown solution is hypertonic compared to Bag B, because the mass decreased indicating that water flowed out of the bag. 1 C The unknown solution is hypotonic compared to Bag C, because the mass increased indicating that water flowed into the bag.