Effect of Molecular Weight on the Rate of Diffusion

Effect of Molecular Weight on the Rate of Diffusion Olive Kristianne C. Quicoy Group 4 Sec. Y-5L October 7, 2015 ------------------------------------------------- A scientific paper submitted in partial fulfillment of the requirements in General Biology 1 laboratory under Ma’am Joan Christine O. Adajar, 1st sem., 2015-2016 ABSTRACT The relationship of molecular weight and rate of diffusion was determined using three colored substances with different molecular weights, namely Potassium permanganate, Potassium dichromate and Methylene Blue. A water-agar gel in a petri dish was used to be able to observe the movement of the particles of each substance. Potassium dichromate had the fastest rate of diffusion among the three substances.†¦show more content†¦The average rate of diffusion of each substance was also computed. The set-up was again observed and drawn after 30 minutes for comparison. Graphs comparing the molecular weights and average rates of diffusion, and time and partial rates of diffusion were then plotted and analyzed. RESULTS AND DUSCUSSION As seen in Table 1.2, Potassium dichromate and Methylene Blue had the same diameter – 6.0 mm – at 0 minute while Potassium permanganate had a diameter of 7.0 mm during the same time. After 30 minutes, Potassium permanganate, Potassium dichromate and Methylene Blue had the diameters of 9.0mm, 12.0mm and 10.0mm, respectively. Potassium dichromate had the largest increase in diameter among the three after 30 minutes. Table 1.1. Diameters of the colored areas made by Potassium permanganate (KMnO4), Potassium dichromate (K2Cr2O7) and Methylene Blue in Agar Water Gel Time(minute) | Diameter (mm) | | Potassium permanganate(MW= 158 g/mole) | Potassium dichromate(MW= 294 g/mole) | Methylene Blue(MW= 372 g/mole) | 0 | 7.0 | 6.0 | 6.0 | 3 | 8.0 | 8.0 | 7.0 | 6 | 9.0 | 9.0 | 8.0 | 9 | 9.0 | 9.0 | 8.0 | 12 | 9.0 | 10.0 | 8.0 | 15 | 9.0 | 10.0 | 9.0 | 18 | 9.0 | 10.0 | 9.0 | 21 | 9.0 | 11.0 | 9.0 | 24 | 9.0 | 11.0 | 9.5 | 27 | 9.0 | 11.0 | 9.5 | 30 | 9.0 | 12.0 | 10.0 | At 0 minute, the colors of Potassium permanganate, PotassiumShow MoreRelatedThe Effect of Molecular Weight on the Rate of Diffusion of Potassium Permanganate (Kmno4), Potassium Dichromate (K2Cr2O7) and Methylene Blue  ¹1556 Words   |  7 PagesThe Effect of Molecular Weight on the Rate of Diffusion of Potassium permanganate (KMNO4), Potassium dichromate (K2Cr2O7) and Methylene blue  ¹ ABSTRACT The effect of molecular weight on the rate of diffusion was determined using the Agar-water Gel Test. 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