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Finding the formula of CuO by reduction

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A.S. Level Chemistry 16/09/02 Finding the formula of CuO by reduction Aim To find the formula of Copper Oxide by reduction. By vaporising ethanol in a reduction tube and heating copper oxide. Apparatus * U tube * 3 rubber bungs * Bunsen burner * Reduction tube * Tube * Spatula * Analytical balance * 6 clamp stands Mineral wool * Matches Chemicals Copper Oxide Ethanol Safety equipment Lab coat 2 safety screens Safety glasses Method 1. Collect all equipment listed above. 2. Weigh a clean, dry reduction tube. 3. Set up the apparatus as shown below. Diagram of apparatus set out 4. Add enough Ethanol to the mineral wool to wet it thoroughly but pour any excess liquid away before setting up. ...read more.


6. Once the meths vapour is passing in a controlled fashion over the oxide light the gas jet at the end of the reduction tube. (The gas must have passed over for at least 4-5 seconds). Turn the flame down to a reasonable size 7. Now heat the oxide strongly until it is completLy converted to Copper. 8. Remove the heat and allow the reduction tube to cool before turning off the gas stream passing through the apparatus. 9. Finally re-weigh the reduction tube containing Copper. Calculation of empirical formula Weight of reduction tube =28.1730 Weigh of CuO= 2.3725 29.9958 - 28.1730 =1.8228 CuO + ethanol Cu + H2O + Ethanol Moles of Cu = 1.8228 =0.0284813 64 Moles of O = 2.3725 - 1.8228= 0.034356 Formula = CuO Conclusion The formula of Copper Oxide is CuO. ...read more.


Next time I do the experiment I can check for oxygen by lighting a splint to see if there is any Oxygen. If there is know Oxygen the splint will go out the actual formula of Copper Oxide is CuO.Therefore from my results I can deduce that I have errors in the experiment. As you can see I have been left with too much Oxygen in the Compound CuO. Therefore next time I do the experiment I could heat it for longer so that all oxygen is removed from the compound. The colour change of CuO to Cu is black to green indication Oxygen has been lost. The colour change took time in my experiment. For more effective heating of the Copper Oxide next time I will spread the CuO thinly so it burns more efficiently. ...read more.

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