The Effect of Different Molar Mass within the Diffusion on Substances

The Effect of Different Molar Mass within the Diffusion in Substances

Lunar-maius A. Gaerlan

Group 2 Sec. Times – 9l

August 15, 2012


The effect of molecular weight on the price of diffusion was examined using agar-water gel check. The agar-water gel build was composed of a petri dish of agar-water solution containing three wells. Drops of potassium permanganate (KMnO4), potassium dichromate (K2Cr2O7) and methylene blue(C16H18N3SCl) were concurrently introduced to every well. Methylene blue, obtaining the largest molecular weight, shown the smallest diameter (11 mm) and diffused at the slowest rate (0. 20 mm/min. ). Next is potassium dichromate with a diameter of 24 millimeter and price of durchmischung of zero. 30 mm/min.. The speediest is the potassium permanganate with 19 mm diameter and diffusion rate of zero. 47 mm/min.. Thus, the higher the molecular weight, the slower the speed of durchmischung.


A substance inside the gaseous or perhaps liquid point out consists of elements or atoms that are self-employed, rapid, and random in motion. These molecules frequently collide with each other and with the sides of the box. In a period of time, this movements results in a uniform syndication of the molecules throughout the system. This process is known as diffusion (Everett and Everett, n. m. ). Diffusion occurs naturally, with the net movement of particles flowing from an area of high attention to an area of low focus. Net konzentrationsausgleich can be restated as the movement of particles along the concentration gradient. According to Meyertholen (n. d. ), there are several factors which may affect the rate of diffusion of any substance. These kinds of factors include the size of the particle or the molecular fat of the element, temperature or perhaps availability of energy in the system, difference in concentrations inside system, diffusion distance, of course, if the system involves a membrane or buffer, surface area in the barrier, as well as the barrier's permeability. The greater the concentration of your substance within an area of something entails that the frequency of particles colliding with each other is higher, causing the allergens to " push” the other person at a faster rate. These kinds of collisions are due to the large molecular velocities associated with the cold weather energy " powering” the particles (Nave, 2008). By a given temperatures, a smaller compound is said to diffuse faster than a larger one. The reason is , the larger the size of a molecule, a greater sum of pressure is said to be needed to move the particle (Meyertholen, n. deb. ). With all the same amount of strength, a smaller particle can be moved faster compared to a larger compound. Thus, the hypothesis of the study would be that the rate of diffusion can be inversely proportionate to the size of the compound. That is, a smaller particle is going to diffuse quicker than a larger one. The agar-water skin gels test utilized to assess and verify the effect of the molecular weight around the rate of diffusion of different substances. The set up engaged the introduction of a single drop of potassium permanganate (KMnO4), potassium dichromate (K2Cr2O7), and methylene blue (C16H18N3SCl) in three different equidistant wells on the petri dish with agar-water gel. Three substances are dyes and still have different colors which can make them very easily identifiable and suitable for measurement of the diameter of the drops within a length of 30 minutes. This kind of study was executed to assess the impact of molecular weight for the rate of diffusion of potassium permanganate (KMnO4), potassium dichromate (K2Cr2O7) and methylene blue (C16H18N3SCl) with respect to time via the water-agar gel evaluation. Specifically, this aimed to:

1 . Identify a recurring design among the actions of durchmischung of the chemicals in relation to their very own molecular excess weight; and 2 . Elucidate the principle lurking behind the seen behavior with the diffusion of the substances. The analysis was done in the Biology Laboratory of the Institute of Biological Sciences, University of the Philippines Mis Baños Campus, Los...

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