EquipmentVolume(cm3)Reason for useUncertainty

Volumetric flask500/100It is required to dilute the hydrogen peroxide from 20 vol to 1 vol. It has a small percentage error which makes allows for accurate measurements. The 100cm3 volumetric flask was used in the preparation of catalysts. 0.10cm3

Pipette25It is used to transfer potassium iodide into the conical flask and to dilute the hydrogen peroxide from 20 to 1 vol. It is the one of the most accurate equipment used to measure out chemicals as it has been carefully adjusted to a certain measurement i.e. 10cm3, 25cm3, etc. This also allows for a smaller percentage error which provides more accurate results. 0.06cm3

Burette50.0A burette is used to measure out volumes of the different chemicals needed for the experiment. It is used to measure out the volumes of hydrogen peroxide, sulphuric acid, sodium thiosulfate, water and starch solution.0.05cm3

Beaker250Used to collect waste when zeroing burettes.N/A

Conical Flask250This is used to hold the reactants excluding the hydrogen peroxide for the reaction to take place in. A smaller 100cm3 conical flask was seen to not fully allow the dispersion of starch within solution whereas the larger 250cm3 didnt have this problem.0.05cm3

Funnel-To pour solutions into the burette safely and quickly and minimise any spillage of chemicals.N/A

Marker Pen-To draw the x on the white tile and to label solutions and glassware. N/A

Stopwatch-The stopwatch allowed the measurement of reaction time to be taken easily.0.005 seconds

Water Bath-This is used to vary the temperature of the reactants and as the water bath allowed temperature to be set at a constant, it was preferred over a Bunsen burner as it was more efficient.N/A

Boiling TubeN/AThis was used to collect the hydrogen peroxide from the burette for the reaction.N/A

Thermometer-This is used to measure the temperature of the reactants. 0.5C

White Tile -The conical flask is placed on the white tile as the black x can be viewed well on the white title through the conical flask.N/A