chem lab exp. 1 (ii)

chem lab exp. 1 (ii) - Laboratory 1 Decomposition of KClO3...

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Laboratory 1 Decomposition of KClO3 Name: AZIZAH AHMAD Section Section 50, Monday 2 PM Performed: 8 December, 2008 Submitted: 15 December, 2008 Laboratory Instructor: PAUL MADDEN Your Signature ___________________________________
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Purpose The purpose of this lab was to determine the value of the gas constant, R, by measuring the decomposition of potassium chlorate, KClO 3 , using a liquid displacement method. Procedure 1. A vial of potassium chlorate (KClO 3 ) and a vial of manganese(IV) oxide (MnO 2 ) was obtained and both reactants have been mixed with inert potassium chloride (KCl). 2. The experimental apparatus was assembled as shown lab manual. The Erlenmeyer flask was filled with water, making sure that the bottom oif tube B does not extend below the water level. Glass tube A and the rubber tubing were filled with water by loosening the pinch clamp and attaching a rubber bulb to the end of tube B and applying pressure through it. 3. 0.15 g of the MnO 2 /KCl mix and 0.3 g of KClO 3 were added to the provided test tube. The mass of the test tube and contents were determined to the nearest 0.0001 g and the contents were then mixed. 4. The beaker was filled with about half full of water, the end of tube A was inserted in it, and the beaker was lifted until the levels of water in the flask and b eaker are identical. Then, the clamp was closed, and the water in the beaker was discarded then its mass was then determined. 5. The beaker was set with tube A in it on the bench and the pinch clamp was opened. The small amount of water in beaker was left, at the end of the experiment, the water levels will be adjusted and this water will flow back into the bottle. 6. The lower part of the test tube gently was heated. When the rate of gas evolution slows considerably, the rate of heating was increased, until no more oxygen is evolved. The apparatus was allowed to cool to room temperature. The water levels in the beaker and the bottle were equalized as before and close the clamp. 7. The mass of the beaker with water was determined. The temperature of the water was measured and the volume of the water displaced was calculated using the water density. This is equal to the volume of oxygen produced. 8. The test tube from the apparatus was removed and the tube and the contents was weighed. The difference in mass between this and the original mass of the tube plus solids is the mass of the oxygen produced. 9. The same procedure was repeated for two more times for a total of three trials.
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Data Table 2: Moles of O 2 Evolved. Trial 1 Trial 2* Trial 3 Trial 4 Mass of test tube + reactants (g) 18.843 g 18.731 g 18.846 g 18.727 g Mass of test tube + products (g) 18.733 g 18.686 g 18.729 g 18.611 g Mass of O 2 evolved (g) 0.110g 0.045 g 0.117 g 0.116 g Moles of O 2 evolve (mole) 0.0034 0.0014 0.0037 0.0036 Table 3: Volume of Water Displaced Trial 1 Trial 2* Trial 3 Trial 4 Mass of dry beaker (g) 31.224 g 104.781 g 80.148 g 31.226 g Mass of beaker + water (g) 83.993 g 120.358 g
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This note was uploaded on 03/18/2010 for the course COS 101121501 taught by Professor Langner during the Fall '08 term at RIT.

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chem lab exp. 1 (ii) - Laboratory 1 Decomposition of KClO3...

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