![]() ![]() The cookie is set by the GDPR Cookie Consent plugin and is used to store whether or not user has consented to the use of cookies. The cookie is used to store the user consent for the cookies in the category "Performance". This cookie is set by GDPR Cookie Consent plugin. The cookie is used to store the user consent for the cookies in the category "Other. The cookies is used to store the user consent for the cookies in the category "Necessary". The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional". The cookie is used to store the user consent for the cookies in the category "Analytics". These cookies ensure basic functionalities and security features of the website, anonymously. Necessary cookies are absolutely essential for the website to function properly. Principles of Inheritance and Variation.New Questions and Answers and Forum Categories The presence of the agar in tube 1 does not materially retard diffusion of solutes the rate of diffusion through this gel may be taken, therefore, to be equal to the rate of diffusion through water. Hence HCL diffuses faster in gaseous medium (tube 2) than in semisolid medium (tube 1). The rate of diffusion of gases through a medium is inversely related to the density of the medium. The rate of diffusion of HCl gas is faster in case of tube 2 containing filter paper strip and slower in case of tube 1 containing agar-gel. The rate of diffusion of HCl through the gaseous medium surrounding the strip is recorded by noting the colour change of the strip. The tube is held over a small bottle containing conc. The distance to the diffusion front as indicated by the red colour line is measured at suitable time intervals and the rate of diffusion of HCL gas into agar-gel in millimeter per hour is recorded.Ī strip of filter paper approximately of equal length and internal diameter of tube 2 is cut, soaked in methyl red indicator containing a little 0.1 N NaOH (the strip is coloured yellow) and suspended in tube 2. When the agar sets in the tube, it is held over a small bottle containing conc. Tube 1 is filled with a 2% agar-sol containing 1 ml of methyl red indicator and 1 drop of 0.1 N NaOH (in alkaline medium methyl red is yellow and in acidic medium red). Two apparatus for measuring comparative rates of diffusion through gas and liquid are set up (Figure 2). The rate of diffusion of ether is faster than that of chloroform into water as indicated by their respective volumes. The tubes are set aside for some time and the thickness of the liquids in each test tube is recorded at different intervals. The position of liquid layers in each test tube is marked and their thickness measured. The tubes are stoppered tightly with corks. Now to the first test tube 4 mm depth of water and to the other 30 mm depth of ether are added (both chloroform and ether form the upper layer).Įther must be added carefully to avoid disturbance of water. To one 30 rim depth of chloroform and to the other 4 mm depth of water are added. Here, CuSO 4 or KMnO 4 diffuses independently of water and at the same time water diffuses independently of the chemicals.Įxperiment # 2 Diffusion of Liquid in Liquid: The molecules of the chemicals diffuse gradually from higher concentration to lower concentration and are uniformly distributed after some time.
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