Chemistry
Foul Water
Names:_________________________
Block: ________
Data Table
Oil
Present?
Color
Clarity
Mixture or If mixture,
Pure
which
Substance
type?
Solids
Present?
Odor
Volume
Before treatment
After oil-water
separation
After sand
filtration
After charcoal
Absorption/filtration
Complete the following calculations and answer the following questions.
1. What percent of the original foul-water sample was recovered as “pure” water?
Percent of water purified =
Volume of water purified x 100
Volume of foul-water sample
2. What volume of liquid was lost during the purification process?
3. What percent of your foul-water sample was lost during the purification process?
4. What does this percent lost tell you about this particular filtration process?
5. What was the purpose of the three different filters?
A. pipet
B. sand and gravel filter
C. charcoal filter
6. Is your “purified water” sample “pure” water? How do you know?
7. Suggest how you might compare the quality of your water sample with that of other laboratory
groups. That is, how can the relative success of each laboratory group be judged? Why?
8. How would you improve the water-purification procedures you followed so that a higher
percent of purified water can be recovered?
9. What type of mixture is the final filtrate?
How would you confirm this?