Question

this is a lab of Percentage of Oxygen in Potassium

Chlorate

Percentage of Oxygen in Potassium Chlorate Purpose of the lab Te esperimentar e te m o rgen in een constante decoration of poche Introduction The thermal decomposition of potassium chore can be described by the following 2KCIO 2 Cl +30 Ent epeal tehnic p e cale from the KCIO We poschodecomposes simply by heating the reaction is very Actitud is a m a ture accent the reaction, we not beng consume r son and m ed chemically unchanged in this case, manganese (IV) i Mo d as ac t . Although the Cascos Gwygon, the catalyst does not undergo any chemical change and does not contribute to the wygen e by the potassium chor As with any catalyst, the amount of all the beginning will be the same as alte end of the reaction The experimental procedure is weigh a quantity of potassium chlorate, heal to drive of the orygen, and then weigh the residue, which is assumed to be potassium chloride. The loss in mass represents the oxygen condoleongnapotassium chlorate The above procedure will be carried out in a glass test tube. For the purpose of weight measurements. The container in which the reaction cours, besides the testube includes also the plastic test tube holder provided in the label and catalyst. Both the plastic holder and catalyst contribute to the total mass of the container, The mass of catalyst does not change in the process and its contrbution to the total mass is the same at the beginning and the end of experiment when using the analytical balance is possible that the test tube will be ter than the walls of the balance. Open the top of the balance to take your measurement in a thermal decomposition such as the product must be held to constant mass before you can be sure the docomposition is complete. After the first heating, cooling, and weighing of the decomposed product the test tuberheated, cooled, and weighed, the two weighing are the same within 10.0069, it may be assumed all the wypan has been removed in the firsthening the masses of the two consecutive measurements differ beyond 10 0059, men a third healing, cooling and weighing must be performed. Continue this process until two consecutive measurements are within 0.005g of each other Safety Precautions: The formation of gas in the bottom of the best tube may result in a sudden expansion blowing hot chicas out of the Me This will happen the test behandled properly during Dealing Wheneng a solid in a s epte b e mother cont and aptently until the corants are buted over the lower of the latte (Refer to exame set up in the video Modigita g e, move me Bunsen bumbac and for over the long of the b r ing the rest over the entire le of the solidne Be sure the best bei pointed into the hood and not at yourself or anyone se while heating Remember that het glass looks like cold glass, be sure to use proper protection when handling hot glassware Procedures Places of manger Mod Monage combustion the be over a Burn bumer for any may be present in the cast and to be when the Mescolheuch more the montre contre Montestand on an analytical bence and record the mass A m bout 10-1.5g of or CIOs to the tube. Be care traduce any foreign others with postmortece empowers could be produced M and record of the corner with the contents Mix by gershang the contents of the tube they are thorough mixed and have a uniform gray appeace Carefully serving the precautions mentioned before the the test tube and its com Heagerly at first, increasing the intensity or the mature seems to boil as it sommes appears to do when bubbles of oxygen are being released. Continue heating for about 5 minutes, and en cool and reweg Repeat the procesin 3.5mte hearing cycles constant mass is achieved Dispose of the reside in the SOLD INORGANIC OXIDING WASTE BUCKET. Rinse the test tube and dispose of the washings in the UQUID INORGANIC OXIDIZING WASTE CONTAINER Calculations ng only the numbers in the m o theint mass of potassium

Answer 1

How would % O2 Differ :

• If test tube (with MnO2 ) was not heated before adding KClO3 , we will report higher % O2 than actual amount as moisture will be removed with O2 as we have not removed it by prior heating.
• Amonut of O2 ( %) will depend on the mass of plastic test tube stand, if it is higher than initial one we will report lesser % , and if lesser than we will report higher O2 %.
• KClO3 , will not decompose completely, thus we will report lesser % O2 than actual amount.
• If some contents were blown out , we report higher % O2 than actual amount as final mass will more less.
• If KClO3 contains KCl ,than we report lesser % O2 than theoretical calculations, as O2 will evolve from KClO3 only.