Rate of diffusion essay

To test the effect of molecular weight for the rate of diffusion, several experiments were performed. Among which is the glass pipe test where cotton projectiles of the same size were moistened in two different substances (NH4OH and HCl). These cotton balls were blocked at each part of a glass tube. After some time, formation of the white diamond ring occurred. The white band, in fact , is actually a product of the reaction between molecules of ammonia (NH3) and hydrochloric acid (HCl).

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Benefits showed that NH3 with a relatively lower molecular pounds (MW NH3= 17. goal g/mol) than HCl (MW HCl= thirty-six. 46 g/mol) diffused at a faster rate (dave NH3 = nineteen. 35 cm) compared to HCl (dave HCl= 16. 18 cm). An additional experiment was performed with the aid of petri dish containing a great agar-water carbamide peroxide gel with three wells. 1 drop of each substance (potassium dichromate, potassium permanganate, and methylene blue) was placed on each individual well.

In three-minute time period for 30 minutes, potassium permanganate, which has the cheapest molecular excess weight (MW= 158 g/mol), viewed the largest size (d= seventeen.

5 mm) and dissipated with the quickest rate (0. 52 mm/min). On the other hand, methylene blue, containing the highest molecular weight (MW= 374 g/mol), exhibited the tiniest diameter (d= 10. a few mm) and diffused with all the slowest charge (0. 18 mm/min). Therefore, the lower the molecular excess weight, the faster the rate of diffusion.


Every group obtained a petri dish of agar-water gel with 3 wells. These wells had been labeled: potassium permanganate (KMnO4), potassium dichromate (K2Cr2O7), and methylene green. At once, a drop of each substance was placed into every well correspondingly. Then, in three-minute interval for thirty minutes, the enhancements made on diameter (in mm. ) of the colored areas was measured and recorded in Table four. 2 . In addition, the set-ups at actually zero minute along with 30 minutes were drawn intended for comparison in Figure 5. 1 and 4. a couple of respectively.

The regular rate of diffusion (in mm/min. ) was calculated afterwards. This could be done by calculating the part rate of diffusion by using the equation:

Part rate (rp) = (di ” dalam -1)/( ti ” ti-1)

Where: di= diameter of colored are at given period

di-1= diameter of colored happen to be immediately prior to di

ti= period when pada was assessed

ti-1= time immediately ahead of ti

In that case compute the mean with the addition of all the computed values divided by the volume of values. All computed beliefs were documented and tabulated in Desk 4. 3. Finally, the standard rate of diffusion of each substance against its molecular weight as well as the partial level of diffusion of each element against the period elapsed was plotted and given an interpretation in Figures 5. 3 and 4. 5 respectively. OUTCOMES AND DIALOGUE

Table 4. 2 shows the enhancements made on diameter of potassium permanganate, potassium dichromate and methylene blue positioned on a petri dish that contain an agar-water gel at three-minute span for 30 minutes. Using the table, it can be inferred that the substances with reduce molecular weight diffuse quicker than substances with larger molecular pounds. For instance, potassium permanganate, based upon the data presented, has a molecular weight of 158 g/mole.

Its diameter, relative to the distance the shaded areas entertained, became bigger from a few mm to 17. 5 mm in 30 minutes. Additionally , the diameter of potassium dichromate (MW= 294 g/mole) increased via 5 logistik to of sixteen mm in same period interval. In addition, methylene blue, with a molecular weight of 374 g/mole, had the smallest diameter increase having a diameter of five mm in 0 small to twelve. 5 after 30 minutes. (TABLE 4. 2)

Figure 4. 1 and Figure 4. 2 reveals the size of colored areas in 0 minute and after 30 minutes respectively. Analyzing the figures, an increase in size of the coloured areas was noticed. It absolutely was observed that the methylene green displayed the smallest increase in size while potassium permanganate showed the largest increase. (FIG four. 1) (FIG 4. 2)

It can be portrayed in Desk 4. a few that there is a relationship between average rate of durchmischung and molecular weight of potassium permanganate, potassium dichromate, and methylene blue. KMnO4 which has the minimum molecular excess weight attained the highest average level of konzentrationsausgleich with 0. 52 mm/min. K2Cr2O7, alternatively, had zero. 37 mm/min average price ofdiffusion. Furthermore, methylene blue which has the highest molecular pounds displayed the lowest average price of durchmischung with only 0. 18 mm/min. (TABLE 4. 3)

As noticed in Figure 4. 3, potassium permanganate, becoming the least heavy among the 3 substances, obtained the highest average rate of diffusion (0. 52 mm/min. ) when methylene blue, being the heaviest, attained the lowest average rate of diffusion (0. 18 mm/min. ). (FIGURE 4. 3)

Lastly, in Figure four. 4, effects showed that the partial costs of diffusion decreases while the time increases. Potassium dichromate, for example , had 1 . seventeen mm/min. price of diffusion in three minutes but simply had 0. 33 mm/min. rate of diffusion after 30 minutes. (FIGURE 4. 4)

Relative to the hypothesis manufactured, the agar-water gel test out provided a concrete support on the relationship between the durchmischung rate of any substance as well as molecular fat. The two posseses an inversely proportionate relationship in a way that if a material has a low molecular fat, then it would have a high level of diffusion and vice versa. SUMMARY AND CONCLUSIONS

The agar-water skin gels test utilized to determine the effect of molecular pounds on the price of diffusion. A drop of potassium permanganate, potassium chromate, and methylene blue was added to their particular wells simultaneously. After thirty minutes, in three-minute interval, the diameter of each well was measured and recorded. Among the list of three, potassium permanganate showed the largest diameter (17 mm) while the methylene blue exhibited the smallest evaluate (10. your five mm).

Furthermore, potassium permanganate had the greatest average level of konzentrationsausgleich (0. 52 mm/min. ) and the methylene blue had the lowest (0. 18 mm/min. ). Based upon the outcomes of the experiment, the researcher found out the molecular weight and the level of diffusion of a material is inversely proportional to each other given that the greater the molecular weight, the bottom will be its rate of diffusion. Because of this, this realization agrees with the hypothesis formulated. Various factors may also affect the rate of diffusion of your substance.

Certainly one of which is the temperature in a way that as temp increases, the amount of energyavailable pertaining to diffusion is definitely increased. As a result, the higher the temperature, the greater will be the charge of diffusion (Meyertholen, 2007). Moreover, the rate of durchmischung may also be afflicted with concentration gradient, diffusion distance, surface area, and permeability. Experts recommend to execute an experiment to better comprehend the relationship between the said elements and the price of durchmischung of a material. LITERATURE OFFERED

Chang, R., Overby, L., 2008. Standard Chemistry: The primary Concepts (6th ed. ). New York, USA: Mc-Graw Mountain. P. 162. Duka, I-M. A., Diaz, M. G., Villa, And. O., 2009. Biology We Laboratory Manual: An Researched Approach (9th ed. ). UPLB: s. 34-39 Enger, E. G., Kormelink, M. R., Ross, F. C., Smith, Ur. J. 1991. Concepts in Biology (6th ed. ). USA: Wm. C. Darkish Publishers. g. 34-35. Meyertholen, E. (n. d. ) Diffusion.. Utilized September six, 2013.

Miller K. L., Levine, M. 1991. Biology. Needham, Massachusetts: Prentice Hall. p. 99-100 Robinson, Watts. R., Odom, J. M. and Holtzclaw, H. Farrenheit. Jr. 1992. Chemistry: Concepts and Designs. Lexington, Ma: DC Heath. p. 282. Zumdahl, H. S. 1992. Chemical Rules. Lexington, Massachusetts: DC Heath and Organization. P. 155-156


Diffusion may be the process with which molecules of your substance push from regions of higher focus of that material to regions of lower focus (Miller and Levine, 1991). It is also thought as the net movement which is the movement of molecules in one direction minus the movement of molecules inside the opposite direction (Enger, 1991). In other words, net diffusion is the movement of molecules over the concentration lean.

Diffusion can also be used to describe the blending of smells. For example , when a small amount of pungent-smelling ammonia can be released at the front of a class, it takes a little while before everyone in the room can smell this, because period is required to get the hydrogen to mix with all the air (Zumdahl, 1992). One of the primary factors that affect the price of konzentrationsausgleich is the molecular weight. If the mixture of gases is placed within a container with porous surfaces, diffusion with the gases over the walls take place.

The lighter gasesdiffuse throughout the small opportunities of the porous walls faster than the heavier ones (Robinson, 1992). Determined by this, a great experiment was performed to find the relationship between the molecular excess weight and price of diffusion of a material. The a glass tube set”up was created by plugging in two organic cotton balls which can be uniform in proportions at the reverse ends of your glass conduit.

One natural cotton ball was soaked in ammonium hydroxide (NH4OH) and the other with hydrochloric acidity (HCl). Benefits showed that molecules of NH4OH diffused at a faster rate compared to the molecules of HCl. Therefore, the hypothesis will be: a molecule using a lower molecular weight diffuses in a quicker rate than the usual molecule which has a higher molecular weight.

This kind of study aimed to:

1 ) Further clarify the effect of molecular fat to the charge of durchmischung. 2 . Discover other factors that may affect the level of konzentrationsausgleich. This examine was done at Area C-127, Commence of Biological Sciences, College or university of the Thailand ” Mis Banos, Descuido on Sept. 2010 2, 2013.

You may also be considering the following: two variables that affect the level of diffusion


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