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Osmosis Investigation - effect of different strength of glucose solution on potato and apple strips.

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Introduction

Title: Transport across membrane Aim: To investigate the osmosis in apple and potato tissue when immersed in different concentrations of glucose solution. Research question: What is the effect in length of the potato and apple strips when submerged in glucose solution with difference concentration that is 0.2M, 0.3M, 0.4M, 0.5M and 1.0M for 120 minutes? Hypothesis: As the concentration of the glucose solution gets higher, the differences in length of the strips get bigger. Variables: Independent variable: Concentrations of glucose solution. Dependent variable: Different in length of the strips of apple and potato. Constant variable: 1. Initial length of the apple and the potato strips which is 4.5 cm and their diameter 0.4 cm. The diameters are fixed by using exactly the same size cork borer while the length of the strips which is 4.5 cm measured using a 15 cm ruler. 2. Time taken for the apple and potato strips to be immersed in their respective glucose solution that is fixed to 120 minutes. The initial time of the strips started to immerse in the glucose solution is taken and they are taken out from the glucose solution after 120 minutes with uncertainties one minute. ...read more.

Middle

Table 3.1: Table shows the recorded data for the average difference of the potato strips, cm for each glucose concentration mol/dm3. Molarity, M Average difference of potato strips, cm 0.2000 0.1667 � 0.0470 0.3000 0.0000 � 0.0000 0.4000 0.1667 � 0.0470 0.5000 0.2000 � 0.0816 1.0000 0.3333 � 0.0944 * Note that all the standard deviation value is in bold state. Graph 1.1: Shows the difference in length of potato strips against the concentration of sucrose solution. Graph 1.2: Shows the difference in length of apple strips against the concentration of sucrose solution. Graph 1.3: Shows the comparison between the apple and potato line graph. * Note that the number in the x-axis represents the following: 1 = 0.2 mol 2 = 0.3 mol 3 = 0.4 mol 4 = 0.5 mol 5 = 1.0 mol Qualitative quantity: Table 4.1: Table shows the observational data of physical condition of each apple strips and level of glucose solution after being immersed in sucrose solution for 240 minutes level of glucose solution Concentration of glucose solution mol/dm� 0.2 0.3 0.4 0.5 1.0 Physical condition of each apple strips Very turgid and firm Very turgid and firm Flaccid and soft Flaccid and soft Flaccid and soft Level ...read more.

Conclusion

4. There might be parallax error during the reading of the volume of the water. This can be avoided by making sure that the eye levels are the same with the meniscus of water during the reading. 5. The shape of the boiling tube is round which based on human limitations there might be a little slanting thus affect the reading of the volume taken. This is hardly avoided, but it can be reduced by placing the boiling tube on a flat surface by a straight ruler to make sure that there will be less slanting. 6. The time of the experiment should be lengthening. The more the time might bring to more clear and precise result. The time 240 minutes should be lengthening to 480 minutes. Appendix: The preparation of 0.2, 0.3, 0.4, 0.5 mol/dm3 of glucose solution from 1.0 mol/dm3 of glucose solution. Using the formula: M1V1 = M2V2 M1= Molarity of standard solution V1= Volume of standard solution M2= Molarity of desired solution V2= Volume of desired solution Example: prepare 20cm� 0.2mol dm �� glucose solution. 1.0 mol dm �� (V1) = 0.2mol dm �� (20cm�) V1 = V1 = 4.0cm�20cm� ?? ?? ?? ?? Biology Lab Report Fikri Azzim bin Jumadi user All rights reserved(r) ...read more.

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