Combustion of Ethyne Lab PDF

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Lab report submitted in University/Academic Grade 11 Chemistry. This was for the Combustion of Ethyne Lab. ...

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Friday, March 23rd, 2018 Combustion of Ethyne Lab Test Tube #1: 3C2H2 (g) + 3O2 (g) → 4C (s) + CO2 (g) + CO (g) + 3H2O (l) I decided to match the 3rd equation with the 1st trial. When the gases inside the test tube were put in contact with the burning splint, a small popping sound and a flame at the rim of the test tube was created. The flame slowly traveled down the test tube, creating soot and water droplets, and eventually disappeared about 2/3 down the test tube. The minimal amount of soot created indicated that this was an incomplete combustion reaction. I decided to match this trial with equation #3 because the equation had 6 carbons on the reactant side and only 4 lone carbons (solid) on the product side indicating that soot had been created, with the other 2 carbons being used to create carbon dioxide and carbon monoxide. This equation showed that less soot was created than the 1st equation did, which is why I matched it with the 1st trial, since less soot was created than in the 2nd trial (2nd trial: entire test tube was filled with soot so it would make sense for it to be with the 1st equation). Test Tube #2: 2C2H2 (g) + O2 (g) → 4C(s) + 2H2O (l) I decided to match the 1st equation with the 2nd trial where the test tube was filled halfway with ethyne gas and the other half was filled with air (20% oxygen). When I reacted the gases inside of the test tube with the burning splint, I experienced a brief popping sound and immediately the entire inside of the test tube became coated with soot. There were a few droplets of water at the bottom of the test tube that were formed. I chose to match the 1st equation with this trial (trial #2) because there was soot created in both (equation and trial), indicating that they were both incomplete combustion reactions. It was tough to immediately differ between which of the 1st and 2nd trials should have been matched with the 1st equation because both were incomplete combustion reactions that created water and soot. I was able to match the 2nd trial with the 1st equation once I analyzed the 2 trials and realized that the 1st equation had 4 carbons (solid) on both the reactant and product sides. This indicated to me that this equation should be matched with the 2nd trial because both resulted in the most soot created. Test Tube #3: 2C2H2 (g) + 5O2 (g) → 4CO2 (s) + 2H2O (l) I decided to match the 2nd equation to the 3rd trial where the 1/12 of the test tube contained ethyne gas, the ratio of ethyne gas to oxygen gas being 1:2:2 which is extremely close to the minimum ratio for a complete combustion reaction. This is one reason why I matched this trial (#3) and equation (#2), because the trial and equation both expressed a complete combustion reaction. Both the equation and the trial did not show that soot or carbon monoxide, was created, indicating that they were not incomplete combustion reactions. No other equation or trial expressed a complete combustion reaction, leaving me with no other choice then to match trial #3 and equation #2 together. This trial included a very loud popping sound when the gas came in contact with the burning splint. The flame disappeared immediately after contact with the gases. Droplets of water were created at the bottom of the test tube. Incomplete combustion reactions are undesirable reactions because they produce carbon monoxide, a poisonous, dangerous gas that is fatal to humans. This gas can become even more dangerous to people that have respiratory problems like COPD. They also create soot which is a pollutant. Soot can gather on trees (this occurs especially because of incomplete combustion reaction products being polluted by factories) and cause damage to them. It’s also messy and can build up in all sorts of equipment (i.e. chimneys)....