Hydrogen peroxide decomposes back to water and oxygen when exposed to air and li
ID: 476286 • 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.
Whats the response variable(s)
[ Choose ] 2 10, 20, 30 hours 6 concentration color, hours dark, light 12
what are the factor(s)
[ Choose ] 2 10, 20, 30 hours 6 concentration color, hours dark, light 12
what is the experimental unit(s)
[ Choose ] 2 10, 20, 30 hours 6 concentration color, hours dark, light 12
what are the replication(s)
[ Choose ] 2 10, 20, 30 hours 6 concentration color, hours dark, light 12
what are the treatment(s)
[ Choose ] 2 10, 20, 30 hours 6 concentration color, hours dark, light 12
Explanation / Answer
Whats the response variable(s)
The response variable is the color of potassium permanganate. KmnO4 will change color with hydrogen peroxide and can be calculated the concentration of H2O2.
what are the factor(s)
The factors will be that affect the decomposition of H2O2 in presence or absence of light/air.
This will be no. hours that is exposed.
what is the experimental unit(s)
The concentration units, here weight%
what are the replication(s)
Each sample is tested twice for the measurements
what are the treatment(s)
Each sample carried out in presence of dark and light.
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