Hydrogen peroxide decomposes back to water and oxygen when exposed to air and li
ID: 3201944 • Letter: H
Question
Hydrogen peroxide decomposes back to water and oxygen when exposed to air and light. When bought at a pharmacy for home use, hydrogen peroxide is sold in dark bottles that are labeled as a concentration of 3% by weight. A chemistry student wants to test the concentration of hydrogen peroxide that has been decanted to light and dark bottles, and exposed to air for 10, 20 and 30 hours. The concentration is tested by titration with potassium permanganate, and each sample is tested twice. What is the response variable, factors, experimental units, replications and treatments?
Explanation / Answer
Based on the information given the answers are as follows
response variable : Concentration of hydrogen peroxide , the one we are interested in
factors : shade of the bottles(light,dark) , Air expose time - the 2 factors on which the result would depend and vary
experimental units : hydrogen peroxide
replications : each sample is tested twice
treatments : Combinations of factor levels so Light 10 Dark 10 ,Light 20 Dark 20 ,Light 30 Dark 30
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