Essay on Defining The Problem And Selecting Variables

Essay on Defining The Problem And Selecting Variables

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Mani Kallupurackal
Biology 2 IB
I. Design
Aspect 1: Defining the Problem and Selecting Variables
Research Question/Problem: Does the amount of concentration of sucrose in water effect the amount of water passed through dialysis tubing?
Variables: Dependent- The amount of water gained in the separate dialysis tubing
Independent- The solutions with different concentrations of sucrose in the dialysis tubes which are 0M, .2M, .4M, .6M, .8M, and 1M concentrations of sucrose.
Other relevant variables that need to be controlled- The temperature of the water; the amount of water, 250mL, in the beakers where the tubes are put in. The follow through of when checking mass of final water to wipe off all external water outside of dialysis tubing. The time each tube is in the beaker has to stay constant. The length of the dialysis tubing and the amount of solution inside of the tubing.
Aspect 2: Method that Controls Variables
Variables are controlled by using the same temperature of water for all beakers. Cutting all dialysis tubing 7in. long. Pouring into all tubes 25mL of sucrose solution. Double checking all tubes to remove excess air before tying the knot. Double check when weighing the tubes that there is no external water on the tubes; make sure to dry with paper towels. Make sure to keep tubes separated so they do not get mixed up ruining the results. Made sure I only the tubes to stay in the water for 30 minutes each; have a timer. Also, made sure the scale was at zero before putting anything on.
Aspect 3: Method For Collection of Data
When we gathered at the lab table we first acquired all our needed materials which were: 6 pieces of dialysis tubing, masking tape, timer, marker, a ruler, distilled water, 0.0M sucrose solution (di...


... middle of paper ...


...travel, temperature, molecule solubility, membrane surface area over which the molecule can work.

Work Cited:
Bethany, Lye. "Diffusion." Diffusion. Bethany Lye. Web. 16 Aug. 2014. .
Bethany, Lye. "Diffusion." Diffusion. Bethany Lye. Web. 16 Aug. 2014. .
"Dialysis Tubing." Dialysis Tubing. Newton, June 2012. Web. 17 Aug. 2014. .
"Diffusion and Osmosis." Diffusion. Biology Corner. Web. 16 Aug. 2014. .
Sabu, Norsaliza. "Movements of Substances Acroos The Plasma Membrane in Everyday Life." Blogspot. Norsaliza, 28 Feb. 2011. Web. 17 Aug. 2014. .

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