Monday 9-14 and Tuesday 9-15
Major Quiz and Foul Water Lab
Mrs. Wilson
Objectives
Use physical changes, specifically filtration and
adsorption, to purify a sample of foul water.
Assess your knowledge of Lessons 1.3 to 1.7.
Homework: Foul Water Lab Sheet
Schedule
1. Perform Part 2 (Sand Filtration) **PLEASE READ THE INSTRUCTIONS
WITH THESE CHANGES
- Wash the graduated cylinder and beakers with
soap/water and brushes before starting.
- The sand/gravel cup and holes have already
been made.
- Pour your foul water through the sand/gravel
SLOWLY and catch the filtrate in a clean beaker.
- Do not dispose of the sand/gravel cup or its
contents.
- Observe your filtrate and record observations.
Measure volume. USE ONE UNCERTAIN DIGIT.
2. Perform some of Part 3 (Charcoal Adsorption)
- Obtain charcoal and filter paper from me.
- Fold your filter paper like this.
- Follow the instructions for adding the charcoal.
- Set up your filtration like this.
- Pour your liquid through the funnel SLOWLY and
on the filter paper.
- We will do the major quiz while everyone’s
setups continue filtering.
Major Quiz
Obtain a calculator and a periodic table.
Work by yourself. Work silently.
No questions may be asked or answered
once the quiz papers are out.
Dimensional analysis, scientific notation,
and use of units are expected on the short
answer.
Turn in your completed quiz into the Class
In bin.
Please follow the LASA honor code.
Schedule 3. Finish Part 3 (Charcoal Adsorption) **READ THE
INSTRUCTIONS
- Re-wash glassware as necessary.
- Refilter if necessary – If you followed instructions
before, your filtrate should be clear; no particles.
- Observe the properties of the purified water.
- Measure volume of your water in the graduated
cylinder. USE ONE UNCERTAIN DIGIT.
- Used charcoal goes into the labelled waste beaker.
- Re-wash glassware, disassemble the filtration
apparatus, wipe down your lab table, and
wash your hands.
Calculations: SHOW WORK/USE SIG FIG RULES AND UNITS
1. Find % “pure” water from original “foul” water sample:
% pure = final volume
x 100 = _______ml x 100
original volume
ml
2. Find the water volume lost during purification:
Original _________
Final - _________
= _________ mL lost during purification
3. Find % water lost during purification: (use calculation #1 as
your model and your answer from calculation #2).
0A Period Histogram Data
** Send one person from your group to
record your group’s percent recovery
value.
Group
Percent Recovery (%)
1st Period Histogram Data
** Send one person from your group to
record your group’s percent recovery
value.
Group
Percent Recovery (%)
3rd Period Histogram Data
** Send one person from your group to
record your group’s percent recovery
value.
Group
Percent Recovery (%)
5th Period Histogram Data
** Send one person from your group to
record your group’s percent recovery
value.
Group
Percent Recovery (%)
7th Period Histogram Data
** Send one person from your group to
record your group’s percent recovery
value.
Group
Percent Recovery (%)
Construct a Histogram
** Use a ruler and label the axes with titles
and appropriate units.
EXAMPLE ONLY
The number
of times that
groups in
the class
got that
percent
recovery
range
Intervals
for
percent
recovery
(ex.
40.0% 49.9%,
etc.)
Use YOUR class’ data to complete the
rest of the questions.
Please follow the LASA honor code.
Examine the rubric to see what is expected.
Staple your copy of the rubric to the back of the
lab sheet.
It is permissible to share data but not work. Work on
all labs are individual. Papers will be compared to
see if methods, words, expressions, etc. are very
similar or are identical. Copying work is not
permitted at any time.
Make your work only your own… and not anyone
else’s.