Chemistry Reference
In-Depth Information
Catalysts can take many forms. A
homogeneous
catalyst is in the same
phase or state of matter as the reactants it is catalyzing. For example, a
liquid catalyst in a reaction between liquids is a homogeneous catalyst.
A
heterogeneous
catalyst is in a different phase than the reactants, such
as a solid catalyst for a reaction between gases. In this experiment, you
will observe the decomposition of hydrogen peroxide to water and oxygen
both with and without a catalyst, manganese dioxide. The amount of
hydrogen peroxide remaining will be tested by
titration
with potassium
permanganate, a deep purple chemical that turns clear when reacted with
hydrogen peroxide.
Time Required
30 minutes
Materials
2
6 percent hydrogen peroxide (H
2
O
2
) solution
2
manganese dioxide (MnO
2
) powder
2
2 percent potassium permanganate (KMnO
4
) solution
2
burette
2
burette clamp
2
ring stand
2
funnel
2
graduated cylinder
2
4 medium-size beakers
2
spatula
2
electronic balance
2
plastic weigh boats
2
stopwatch
2
labeling tape
2
goggles
2
science notebook
