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Gold Seal Lesson:
Salt Content Of
Sea Water
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Copernicus
Education Gateway
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Subject:
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Mathematics
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Grade:
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9-12
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ICLE Standards:
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Mathematics: Understand and apply ratios,
proportions, and percent in a variety of situations.
Science: Understand the structure and properties of matter.
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Performance Task:
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Andre works for a company that develops sports
equipment. His specialty is developing camping equipment. His company has
been commissioned by an environmental remediation company working the in
the Middle East to develop individual units for the desalination of water.
In this task you will work in pairs to perform a desalination of water to
find the percent by mass of salt in sea water.
Materials Needed:
Sea water (can be prepared by purchasing Instant Ocean from the local pet
store)
Bunsen burner
Distillation apparatus
Metric balance
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Obtain 50-ml of sea water and find its mass. Record the mass in the data
table below.
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Set up the distillation apparatus for your experiment. Determine the
mass of the distillation flask and record it in your data table.
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Boil the sea water in the distillation apparatus until only the sale
remains in the flask, being careful not to burn the salt.
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Determine the mass of the condensed water collected and the mass of the
salt in your 50-ml sample. Record in the data table.
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Compute the percent of water and the percent of salt for your sample of
sea water. Show any formula, proportions, calculations, etc. that you used
to find this percent of salt. Record in data table.
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In your science lab book, write a brief description of the distillation
process.
Optional
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Research industrial desalination methods. Write a paper addressing uses
for all products of the process of desalination.
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Based on your research, design and build a model desalination unit for
individual use.
Data Table
Mass of Sea water
Mass of Distillation Flask
Mass of Distillate $ of Water in 50-ml Solution of Sea water
Mass of Salt in 50-ml
Sample of Sea water % of Salt in 50-ml
Sample of Sea water
Note to the teacher: This activity may be used to integrate basic
mathematics into earth science and chemistry. Concluding this activity,
students will have an understanding of separation techniques of solutions
and how the components of solutions can be expressed as percent, as well as
an understanding of the components of the Earth's oceans.
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Knowledge / Skills:
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Know and apply the principles of scientific
inquiry. (xs1)
Plan and apply real or hypothetical models and
constructions to facilitate investigation and learning and the solution to
practical problems. (xs2)
Measure properties of the environment using dimensional
quantities such as time, length, mass, pressure, volume, acceleration, etc.
Compare quantities and consider the error involved with measuring
environmental properties. (s23)
Perform operations with signed (positive and
negative) numbers, including decimals, ratios, percents, and
fractions. (m1)
Gather information from a variety of sources,
including electronic sources, and summarize, analyze, and evaluate its use
for a report. (ela3)
Use writing as a tool for learning in formats
such as learning logs, laboratory reports, note-taking, and journals. (ela40)
Use expository writing skills in subjects other
than English language arts. (ela58)
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Rubric:
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(Material in
parentheses refers to the optional part of the task.)
3 Points = The student sets up a distillation
apparatus correctly and uses proper lab techniques in the distillation
process. He/she accurately finds the percent of water and mass and the
percent of salt in the sample. The data table is complete and accurate.
His/her lab book entry demonstrates an understanding of the distillation
process. (The student demonstrates good research skills, and his/her
written paper identifies several uses for the desalination of sea water.
He/she designs and builds a model of a desalination unit for individual use,
demonstrating both logical thinking and effort).
2 Points = The student needs some coaching in
setting up the distillation apparatus. He/she performs the necessary
calculations with help, but the work contains some minor errors and/or the
student needs some help in performing the calculations. The data table is
complete, but contains a minor error. The student's lab book entry is not
very well written and shows that the student has only a minimal
understanding of the well written and shows that the student has only a
minimal understanding of the distillation process. (The student has
adequate research skills, and his/her written paper identifies one or two
uses for the desalination of sea water. His/her design and construction of
a model of a desalination unit for individual use shows minimal logical
thinking and effort.)
1 Point = The student does not complete the assignment. The data table
is incomplete and contains major errors. The student needs constant
coaching to perform the calculations and, even with that, makes several
computational errors. The student's lab book entry is poorly written,
incomplete, and shows a lack of understanding of the distillation process.
(The student does not demonstrate adequate research skills, and his/her
written paper is vague. His/her model shows little logical thinking of
effort.)
0 Points = The student does not complete the task
and shows little, if any, understanding of the concepts in this activity.
Little effort is applied, and the student shows no ability in applying the
concepts in this learning task. (The student does not know how to do
research, and the written paper, if attempted, is meaningless. The model,
if made, is crude and shows no logical thinking or effort on the part of
the student.)
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Keywords:
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PHYSICS
PHYSICAL PROPERTIES
DATA COLLECTION
DATA ANALYSIS
INFERENCE CHEMISTRY
LAB EXPERIMENTS
SOLUTIONS
SCIENTIFIC PROCESS
RATIO
MODELS & CONSTRUCTION
EXPOSITION
EARTH
SCIENCE
SCIENTIFIC INQUIRY
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Grades:
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Kg [] - 1 [] - 2 [] - 3 [] - 4 [] - 5 [] - 6 [] - 7 [] - 8 [] - 9 [X]
- 10 [X] - 11 [X] - 12 [X]
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ICLE Application:
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D
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© 2000 International
Center for Leadership in Education
1587 Route 146 - Rexford - NY - 12148
518.399.2776 Fax: 518.399.7607
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