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MERLOT II


    

Learning Exercise


Material: Acid-Base-Neutral?
Submitted by: Cathi Graves Tudman on Jun 30, 2006
Date Last Modified: Jun 30, 2006
Title: Visual ph Scale
Description: This lab will allow students to use litmus paper to check the ph of various household items.
Type of Task: Core activity, Individual, Student-centered
Time Required 2 classes (90 min. blocks) or one week for traditional schedules.
Topics: CA Standard 5 (e)
Reactions
(determine whether a solution is acidic, basic or neutral)
Course: 8th Grade Physical Science
Audience: College General Ed, Grade School, High School, Middle School
Categories:
Prerequisites Skills: understanding lab techniques and data recording.
Learning Objectives: Students will be able to determine the ph level of various solutions (simple household items).
Text of Learning Exercise: Following correct lab procedure, all students will be wearing their safety
glasses until all solutions are picked up.

1. Each student will receive 8 - 10 ph strips (4 or 5 of each color, pink
/blue)
2. All 8 tables will be stations to where the students move to carry out their
scientific investigations of various solutions.
3. There will be small cups or petri dishes and lids containing a small amount
of each solution, as well as an eye dropper.
4. Try to make sure that you have an equal number of acid/base solutions.
Discuss the concept of water being neutral.
(vinegar, baking soda, Windex (weak amonia), lemon juice, borax, epsom salts,
table salt & tap water)
5. Once students have applied a small drop of solution to a strip, they will
proceed in a clockwise fashion to the next station.
6. When all the stations have been visited, everything is collected so a chart
can be made.
7. Glue the strips in whatever fashion the students choose to display a
continuum from acid to base (the more creative the better - top to bottom, left
to right, on the diagonal)
8. Remind the students to label the strips and to write the number value for
the ph.
9. Fill out the lab write up sheet, using complete sentences.
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