paraphrase 4

Abstract:

The main idea of this lab is to decompose hydrogen peroxide by using KI. Moreover,

determine the volume of oxygen gas by using the decomposition reaction. Therefore,

after found the volume of oxygen gas, the temperature and the pressure of water from the

manual, we found the number of moles by using the ideal gas law. The number of moles

for all trials were 1.72*10^-3, 2.6*10^-3 and 2.5*10^-3 moles receptively. The percent

mass were 11.7%, 17.6% and 17% receptively.

Introduction:

In this experiment, we used decomposition of hydrogen peroxide to form the oxygen gas.

Therefore, the Dalton`s law of partial pressure was used and that helped the reaction to

become faster. In the first moment of the reaction, the process of reaction occurs slowly,

but after added KI, the reaction become faster and the volume of the water inside the

graduated cylinder has been changed. After the oxygen gas formed in the Erlenmeyer

flask, we measure the volume of the gas inside the cylinder.

Discussion:

The decomposition hydrogen peroxide experiment was completed very well because it

was easy to follow the procedure from the manual. In addition, the procedure was same

for all trails and that make it more easer to follow. The source of error may happen

because there is some difficult step during set up the equipment, which removed the

parafilm and carefully place, the end of the tubing just inside the graduated cylinder. This

step was the most difficult part in the experiment and that will allow for error to happen.

Another source of error may affect our data was did not give the reaction the enough time

to be completed in the first trial.