Osmosis Essay Introduction

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All cells contain membranes that are selectively permeable, allowing certain things to pass into and leave out of the cell. The process in which molecules of a substance move from an area of high concentration to areas of low concentration is called Diffusion. Whereas Osmosis is the process in which water crosses membranes from regions of high water concentration to areas with low water concentration. While molecules in diffusion move down a concentration gradient, molecules during osmosis both move down a concentration gradient as well as across it. Both diffusion, and osmosis are types of passive transport, which do not require help.
When the concentration of the environment outside of the cell is lower than the inside…show more content…

The potato cores started to decrease in weight as the molarity went up. The potatoes that gained weight were the potatoes placed in deionized water, and the sucrose solution molarity of 0.1.
However, the potatoes started losing weight in the sucrose solution of 0.2 and up.
Sucrose Molarity 0 M 0.1 M 0.2 M 0.3 M 0.4 M 0.5 M 0.6 M
Final Weight (g) 5.1g 5g 4.7g 4.5g 4.2g 4.1g 4.2g
Initial Weight (g) 4.4g 4.5g 4.4g 4.3g 4.4g 4.5g 4.4g
Weight Change (g) 0.7g 0.5g -0.3g -0.2g -0.2g -0.4g -0.2g
% Change in Weight 15.9g 11.1g -6.82g -4.65g -4.55g -8.89g -4.55g

Table 1:

When the potato gains weight it was in a hypertonic solution, and when the potato loss weight it was in a hypotonic solution. If the potato would not have changed weight it would have been an isotonic solution, but that was not the case in this experiment. The potato either gained, or lost weight. This data therefore supports the hypothesis that the potato that would be more hypertonic to the sucrose solution and would gain weight, whereas the potato would be hypotonic to the solution and would lose weight. Based on the data from the graph, the osmolarity of the potato was 0.4 M. Osmolarity is the molar concentration of when there is no change in the weight of the potato. In

...Lab #1: CellMembrane Prepared for Gary V. Lawrence Biology 0983 By Zane Jeffels Partners: Lily Juno, Huynh, and Lin Yan Sun Preformed: October 11th, 2010 Due: October 25th, 2010 King Edward Campus- Rm. 3275 Vancouver Community College Abstract The purpose of this lab was to determine if hemolysis would occur, and how long it would take to occur to red blood cells when blood suspension is introduced to solutions prepared at different temperatures, and solutions prepared at different tonicities.  In part 1, red blood cells were suspended in four different solutions of NaCl (Sodium Chloride) and timed to see if and how long it would take for hemolysis to occur.   In Part 4, blood suspension containing red blood cells was introduced to three solutions with 0.5mL of Ethylene Glycol, each measured at a different temperature(C), and timed to see how many seconds hemolysis would take.   Results of this lab do support the proposed hypotheses, as hemolysis did occur to the red blood cells introduced to both hypotonic solutions of NaCl, and the rate at which hemolysis took place was much more rapid as the temperature was increased.  The solution with the most rapid hemolysis time was 0.18% NaCl and following close behind was the 0.45% NaCl.  This makes sense because water, with the...

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