| Code
Number : |
10B10.20?
|
Disclaimer:
|
Reprinted
by permission of Dick Berg, University of Maryland, for use on this
website.
The
demonstrations contained and referenced herein are listed for the
purposes of cataloging and describing physics demonstrations which
should be conducted only under the direction of a trained
instructional support professional or physicist. These
demonstrations are not presented for the purpose of being conducted
by persons unconnected to this Facility and/or persons not
consulting with or being supervised by the recognized instructional
support professional or physicist and his/her staff. The University
is responsible only for those demonstrations carried out using its
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bears no responsibility for those choosing to use this source
material for their own purposes. All demonstrations described and
contained herein are public domain, and can also be found in
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sources.
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labs will be found on the web site Injuries
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University of Iowa Disclaimer
All Rights Reserved.. |
| Condition
: |
Good
|
| Principle
: |
Acid
- Base Measurements |
| Area
of Study : |
Chemistry
|
| Equipment
: |
pH
Meter and Probe, pH Buffer Solution (Standardizer), Stirring Rod,
Distilled Water in Wash Bottle, Lab Jack, Video Camera and Power
Supply, Daiquiri (Calvert will supply this), Draino, Tomato Juice,
Beer, Lemon Juice, Lime Juice, Mountain Dew, Tap Water and Distilled
Water, Ethyl Alcohol, Milk.
|
| Procedure
: |
Assemble
the apparatus as shown. Check the batteries in the pH meter. Wash
the probe tip with distilled water and then lower it into the buffer
solution and recalibrate. After testing each liquid the probe must
be rinsed with distilled water to maintain accuracy. Approximate pH
ranges are as follows:
| Daiquiri |
2.7
to 2.9 |
| Draino |
8.7
to 8.8 |
| Tomato
Juice |
4.5
to 4.6 |
| Beer
(Bud Light) |
4.55
to 4.65 |
| Lemon
Juice |
2.5
to 2.6 |
| Mountain
Dew |
3.3
to 3.4 |
| Tap
Water |
8.5
to 8.6 |
| Distilled
Water |
6.95
to 7.05 |
| Milk |
6.6
to 6.7 |
| Ethyl
Alcohol |
6.7
to 6.9 |
| pH
Buffer |
7.0 |
Store the pH probe with a few drops of distilled water in the
protective cap as the probe will be destroyed if it remains dry for
extended periods.
|
|
