Question

inside one osmosis bag, a, is a 50% glucose solution and inside bag b is a 20% glucose solution. both bags are put into beakers containing 100% water. (osmosis bags are membranes that let water through but not glucose.) what will happen? • bag a will gain weight • bag b will gain weight • both bags will gain weight • both bags will lose weight • both bags will remain the same 8. a 0.9% nacl solution is isotonic to red blood cells. what will happen if red blood cells are placed into a 9% solution of nacl? • they will burst • they will shrink • nothing will happen • they will expand but not burst • none of the above

Explanation:

For the first question, osmosis is the movement of water from an area of high water concentration (low solute concentration) to an area of low water concentration (high solute concentration). Both bags A (50% glucose) and B (20% glucose) have lower water concentration than the 100% water in the beakers. So water will move into both bags, causing them to gain weight.
For the second question, a 9% NaCl solution is hypertonic (higher solute concentration) compared to red blood cells (which are isotonic at 0.9% NaCl). Water will move out of the red blood cells (osmosis) to the hypertonic solution, causing the cells to shrink.

Answer:

For the first question: Both bags will gain weight.
For the second question: They will shrink.