http://www.woodrow.org/teachers/chemistr...
The link shows an experiment on the effect of catalyst (manganese dioxide) on the reaction rate of hydrogen peroxide. Does the liquid detergent makes the oxygen bubbles bigger or is it a stabilizer?
What is the function of adding liquid dish washing detergent in this experiment?
The detergent is there to make the evolution of gas (oxygen) more visible. WIthout it, the oxygen evolution would be hard to see (small bubbles, hard to quantify); when detergent is present, it tends to capture evolving gas into larger bubbles which are much easier to witness. Thus you can compare the rates of gas evolution, visibly, more easily.
Detergent is also frequently used to detect leaks in air-flow pipes -- coat a little on the surface of the pipe, and anywhere that gas is leaking, bubbles can be seen percolating at the spot. Same idea as the above.
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