Osmolarity concentration and sucrose solutions

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My own group and i also conducted the experiment that estimates osmolarity by enhancements made on weight of potato tubers, this was conducted in order to explore the process of durchmischung and osmosis and more importantly to investigate the question of “Does different concentrations of sucrose solutions have an impact on the final pounds for the potato tubers?  Through this experiment all of us estimated the osmolarity of potato tuber cores simply by submersing several potato callosité into sucrose solutions of 0. 0-0. 6M, and weighing the potato.

The results confirmed the pounds of the potato tubers experienced the highest percent change in excess weight meaning that that they weighed more than initial fat in sucrose solutions via 0. 0-0. 3M; it also showed that sucrose concentrations from 0. 4-0. 6M the pounds of the spud tubers reduced. My group and I figured the osmolarity of the potato was about zero. 4M since the weight of the potato lowered by about -1. 3%, that has been the closest value towards the initial weight of the potato tuber.

We also available that the potato was hypertonic to sucrose solutions of 0. 0-0. 3M and hypotonic to 0. 5-0. 6M.


Diffusion and osmosis are two styles of unaggressive transport. Durchmischung is a randomly movement of molecules by an area an excellent source of concentration for an area of low concentration. According to the book Natural Sciences, “Osmosis is a sort of diffusion that occurs when solutions will be separated by a membrane that is certainly permeably to many molecules however, not to others, that is, a selectively permeable membrane (Scott 2011). To further explore the process of konzentrationsausgleich and osmosis, we carried out an test that would display these procedures and also look into the question of “do several concentrations of sucrose alternatives have an effect on the ultimate weight pertaining to the potato tubers?  In my group’s experiment our goal was going to estimate the osmolarity of potato tubers from fat change. The hypothesis with this experiment was, “if the concentration of the sucrose alternatives in which the spud cylinders happen to be in is usually changed, however hypothesize which the final fat of the spud will also alter. 

As well as the prediction that my group and I formed was “if the pounds if the potato tuber improvements when submerged in different sucrose concentrations, then I predict the weight alter will decrease as the sucrose focus increases.  In my group’s experiment, a lot of potato tubers were examined in different sucrose solutions starting from 0. 0-0. 6 Meters. The spud tubers had been then immersed into all the solutions to check osmolarity and also to see what would happen to its mass if they were in different sucrose solutions. To fully understand the purpose and understand the results received there were 3 major concepts important to find out, they are hypertonic, hypotonic, and isotonic.

Based on the journal The American Biology Teacher, “An isotonic solution is if the solute focus inside a system is equivalent to the solute attention outside of something, thus causing no net change of diffusion. Within a hypertonic option, the solute concentration away from a system is larger than the solute concentration within a system, so normal water diffuses out from the system to try and even out the ratio disparity; this results in the system downsizing in mass (Marvel, Kepler 2009). Within a hypotonic solution however , the solute focus is better within the system than away from the system, so water diffuses into the system; this ends in the system becoming “bloated.

Elements and Methods:

The materials that my own group and i also used in the experiment was 1 large potato, a cork borer this is essential to obtain eight potato tuber cylinders. Forceps were needed and a balance that weighs in at to the nearby 0. 01g, a Petri dish, razor blade, paper towels, ruler, calculator, and also necessary for the experiment to work was sucrose solutions by 0. 1-0. 6 molar. Deionized drinking water was used to represent 0. zero molar inside our experiment and seven 250ml plastic mugs.

First, my own group and i also obtained 50ml of deionized water and 100ml of each of the sucrose solutions and put each answer in individual and branded 250ml newspaper cups. Then by using a natural borer we all obtained several cylinders constitute the potato simply by pushing the borer throughout the length of the spud and removing the spud from the borer. Making sure none of the cyl were broken, we altered the length of each cylinder to 5ml and repeated this task seven times until we had a total of seven unchanged cylinders of equal duration with the peels removed from every length utilizing a razor cutting tool. We then simply placed most seven cylinders into a Petri dish and kept all of them covered to avoid from becoming dry. Before weighing each of the cyl we put each 1 between folds up of a paper napkin to bare out the attributes and ends and then acessed them independently to the nearby hundredths of any gram around the balance. Following doing this stage we registered the ends in our stand.

After considering the spud cylinders we immediately put each in several molar solutions starting with 0. 0M through 0. 6M. After the cyl were submersed in the cups we registered the time witch was several: 20 evening. We then simply took the cylinders out of their alternatives at 4: 30pm and calculated the incubation a chance to be 1hour 10 minutes. The instructions said to leave for 1 . a few hours to 2 hours yet due to time constraints we-took them out a little earlier. After removing the cyl from every sample we all blotted each with a paper towel to eliminate excess option only.

After doing this my group and I recorded the final weights of each and every of the cyl in the date order through which they were in the beginning placed, and recorded this in our desk. After recording our data we finally calculated the percent pounds change for every single of the cylinders. Our group then determined what the parameters were and agreed that the independent varying was the attention of the sucrose solution and the dependent changing was the percent change in fat. This test was repeated only once in the given period we had.


The osmotic concentration was determined by measuring the percent change in mass of the spud cylinders. Change in mass was measured of seven alternatives, each made up of different levels of concentration zero, 0. you, 0. 2, 0. three or more, 0. 4, 0. five, and 0. 6M. The percent change in mass reduced as sucrose concentration increased, therefore , comparable osmotic concentration also lowered as sucrose concentration improved. However , the osmotic focus of 0. 3 Meters sucrose answer was relatively greater than regarding 0. 2 M sucrose solution.

In sucrose attentiveness 0. 6th M, the osmotic concentration decreased practically double from that of 0. 5, and significantly via those of all other sucrose concentrations. The osmotic concentrations were greater than no in sucrose solutions of 0, zero. 1, zero. 2, and 0. a few M; these types of cells had been hypotonic, meaning the potato had more solute. The osmotic concentrations were below zero in sucrose alternatives of 0. 4, zero. 5, and 0. six M; these types of cells had been hypertonic, meaning the alternatives had fewer solute. Osmotic concentration decreased as sucrose concentration increased and cells became even more concentrated. Desk 1: Info for Research Estimating Osmolarity by Change in Weight Sucrose Molarity (M)|0. 0|0. 1|0. 2|0. 3|0. 4|0. 5|0. 6|

Last weight (g)|2. 57|2. 43|2. 48|2. 24|2. 21|2. 05|1. 82|

Initial fat (g)|2. 23|2. 18|2. 28|2. 03|2. 24|2. 19|2. 06|

Fat change (g)|0. 34|0. 25|0. 20|0. 21|-0. 3|-1. 4|-0. 24|

% difference in weight|15. 2%|11. 5%|8. 8%|10. 3%|-1. 3%|-6. 3%|-11. 7%|


When ever starting this kind of experiment my own group and i also formulated and agreed upon the hypothesis of “”if the concentration with the sucrose alternatives in which the spud cylinders will be in is usually changed, then I hypothesize the fact that final pounds of the potato will also modify.  My personal group and i also also decided the conjecture of “if the weight of the spud tuber changes when submerged in different sucrose concentrations, i then predict the weight transform will decrease as the sucrose attentiveness increases.  After doing the experiment and received our benefits, we found that our benefits support each of our hypothesis and prediction. The experiment recognized our prediction because the sucrose solution diffused from regions of high attention to regions of low concentration, thus influencing the final weight of potato cylinders when ever submerged in varying amounts of sucrose concentrations. According to the article Diffusion, Osmosis and Cellular Membranes, There are two ways that the substances in a remedy move: passive transport and active transfer. Active travel requires which the cell work with energy that it has from food to advance the molecules (or greater particles) throughout the cell membrane layer. Passive travel does not need such strength expenditure, and occurs spontaneously (Mccandless 1998).

Because the elements in the sucrose solutions within our experiment were moving with all the gradient meaning they were shifting form areas of high attention to aspects of low attention we discovered that the activity of the elements was unaggressive transport. The principle ways of passive travel is diffusion. Diffusion may be the movement of molecules via a region through which they are extremely concentrated into a region by which they are fewer concentrated. Inside the solutions starting from 0. 0-0. 3M the potato acted as the ‘system’ and the solution concentration inside the system was greater than outside which was the sucrose solution, and so water diffused into the system (potato) and caused this to become bloated. In the sucrose solutions zero. 4-0. six it was hypertonic because the answer concentration was larger than the system’s concentration so the cyndrical tube decreased in size. This try things out allowed us to take a better look at the natural process of life and how and why functions the way it will.

This research allowed all of us to a require a deeper look into the mechanisms of diffusion and osmosis and apply it true to life examples. Based on the book, Cell and molecular biology: principles and trials,  When a diluted answer and a concentrated solution are separated by a membrane layer, there is a net transfer from the solvent from your diluted strategy to the concentrated one. Entrance of drinking water into underlying hairs and movement of water in the plant physique are good instances of osmosis (Karp 1991). Osmosis plays a substantial role in life first, “the entry of water into the roots in the soil occurs by this procedure, cell to cell diffusion of drinking water is handled through this procedure, young cellular material require turgid condition for growth which can be fulfilled by osmosis, and last turgidity of cellular material is preserved by the process of osmosis (Karp 1999).

A few errors were created in the test but none were significant enough to heavily have an effect on our effects. For example , the lengths of the individual potato cyl may possess differed somewhat; we may make mistakes when measuring a specific amount of the sucrose concentrations. All of us also assume that the potato cylinders really should have been incubated longer, mine incubated pertaining to 1 hour 10minutes and the recommendations said to incubate for at least 1 . 5 hours.

For the most part these types of mistakes looked like there was small and not really significant since in the end the prediction and hypothesis was supported. I thought that this was an interesting laboratory to take part in especially as this experiment continues to be conducted a couple of times by different biology labs, I don’t really believe there were any significant weak points to our experiment except maybe the time. It could have been far better to have more a chance to further explore our results. This experiment was conducted smoothly minus complications, and in many cases better backed our prediction. Some inquiries that would be interesting to be solved by further research is could temperature impact the rate of diffusion in sucrose concentrations?

Works Reported

Freeman, Scott. “Lipids, Membranes, as well as the First Cellular material.  Natural Sciences. next ed. Vol. 1 . Boston: McGraw Hillside, 2011. 90-91. Print. Karp, Gerald. Cell and Molecular Biology: Concepts and Experiments. New York: L. Wiley, 99. Print Marvel, Stephen C., and Megan V. Kepler. “A Straightforward Membrane Osmometer System & Experiments That Quantitatively Measure Osmotic Pressure.  The American Biology Teacher 6. 7 (2009): 355-62. Print. Mccandless, David. “BIOLOGY. ARIZONA. EDU.  BIOLOGY. ARIZONA. EDU. School of Az, 27 Feb. 1997. Net. 26 Feb. 2012..


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