Lab Report On Diffusion
The Effects of Molecular Weight and Time on the Diffusion Rate of Substances
Eunice Harriette Q. Abadilla
Group 1 Sec. Y – 6L
October 15, 2014
1A scientific paper submitted in partial fulfillment of the requirements in General Biology I laboratory under Professor Christia A. Guevara, First Semester, 2014-2015
ABSTRACT
INTRODUCTION
Substances contain particles that move in different directions and different rates, depending on some factors. Diffusion pertains to the movement of molecules away from the area of highest concentration (Duka, Diaz, and Villa, 2009). It is present in fluids like gases and liquids. When we smell the odor of a substance, the scent diffuses from the source to our smell receptors. Placing food coloring
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The experiment was conducted at Room 107, Wing C of the Institute of Biological Sciences, University of the Philippines Los Baños Campus, Laguna City on October 8, 2014. The objective of the experiment is to determine the effects of molecular weight and time on the diffusion rate. Specifically, the experiment aims to: determine the relationship of these factors by measuring the diameter of each of the three substances after a period of time; compute the partial rate and average rate of diffusion; and conclude on the relationship of molecular weight and time on the diffusion rate
MATERIALS AND METHODS
To determine the diffusion rate of the substances, agar-water gel, potassium permanganate, potassium dichromate, and methylene blue were used. The agar-water gel was placed in a petri dish. Three wells, about 4 millimeters in diameter, were put on the agar-water gel. A drop of each substance was carefully placed into a well. The petri dish was covered immediately and the diameter (in millimeters) of the colored area was measured. The result was recorded for zero
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On the contrary, methylene blue and potassium dichromate, both having a heavier molecular weight than potassium permanganate, showed larger diameters at 9.3 millimeters and 11.9 millimeters, respectively. Potassium permanganate also demonstrated the lowest average diffusion rate (0.008 millimeters per minute). At 0.27 millimeters per minute, methylene blue had a higher average diffusion rate than potassium permanganate. The substance with the highest average diffusion rate at 0.3 millimeters per minute is potassium
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