The Effect Of Osmosis On Model Cells Of Different Sucrose Concentrations

1281 Words Oct 6th, 2016 6 Pages
Observing the Effects of Osmosis on Model Cells of Different Sucrose Concentrations Cells are the building block of life. But these cells aren’t a closed system. There is a constant movement of various molecules in and out of the cell that brings nutrients in and brings waste out. This movement of particles in and out of cells is based around osmosis. It is written in the Lab Manual (2014) “Osmosis is diffusion of water across a differentially permeable membrane” (p. 97). In this experiment, dialysis tubing, a type of differentially permeable membrane which only lets water molecules through, was used to create bags used to model cells. Four bags were made and labeled “A,” “B,” “C,” and “D.” The bags were filled with sucrose solutions of 1%, 1%, 10%, and 25% respectively, then A was placed in a 10% sucrose solution while the rest were placed in 1% sucrose solution.
Bag A will decrease in weight because the outside solution is hypertonic to it, meaning that, according to OpenStax (2016), the “extracellular fluid has a higher osmolarity than the fluid inside the cell, resulting in water moving out of the cell” (p.148). Bag B will remain the same because it is isotonic to the solution around it, meaning it has the same concentration of sucrose as the surrounding solution. Bag C should increase in weight because the extracellular solution is hypotonic, or has a lower concentration of sucrose, to the bags, and water will flow inside the bags to equalize the concentrations. Bag D…

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