Procedures

Andrew Lepp
Chem 1a lab, Mons- Weds 6pm
Procedures
Start by getting a 50 mL burette and attach the correct size tubing. Fill the train medulla with room temperature water supply and altogetherow to flow into the buret. run low the bulb up and down bank the water in the buret reaches 5 mL. Grab a clean 250 mL Erlenmeyer flask and pour in 2 mL of 3M H2SO4 and pipette in exactly 1.00 mL of the unknown peroxide theme. Be careful when opening and take down the letter on the unknown bottle. Now, in a separate small phial, impart 5 mL of .2M KMn02. Make sure none of the solution has gotten on the outside of the bottle. Using long tweezers, place the vial standing up into the Erlenmeyer flask. Then place a male plug tightly on top of the flask with a vacuum tube connected to the top of the buret. To check for gas leaks, lower the bulb till the water in the buret is about a foot higher than that in the bulb. Leave for 1 2 minutes to see if the level drops. If not, then return the water to equilibrium. Take down what level the water is at in the buret.



Now one of the team members holds the water bulb succession the other gently tips the flask to spill the contents of the atrocious into the mixture in the flask. As the water in the buret lowers, the member holding the bulb lowers it to try to keep the water level about the same as the initial volume. by and by some time has passed and the flask has been swirled to make sure all the reactant has been used then adjust the bulb height till the water levels are at equilibrium again. Then book the final water level, the temperature of the room, and barometric pressure. This will allow you to predict the percentage of H2O2 is in the solution. Repeat the procedure, average the results and determine the precision.If you extremity to get a full essay, order it on our website: Orderessay



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