LaMotte AM-21 Water Pollution Detection Outfit - Manual (Page 37)

Overhead projection demonstration
Quantity Contents Code
60 mL *Range Finding Indicator Solution *2220-H
1 Demonstration Stage, six cell 1038
1 Test Tube, 5.0 mL 0230
1 Spatula 0691
WARNING: Reagents marked with a * are considered to be potential health hazards.
To view or print a Material Safety Data Sheet (MSDS) for these reagents see MSDS CD
or www.lamotte.com. To obtain a printed copy, contact LaMotte by email, phone or fax.
NOTE: Buffer solutions of various pH values are available separately that may be used to
develop reference color standards at their pH values.
Procedure
1. Place the demonstration stage (1038) on the overhead projector and
turn on the projector light.
2. Fill test tube (0230) to the 5 mL line with sample water and transfer this
liquid to a cell on the demonstration stage (1038).
3. Add ten drops of the *Range Finding pH Indicator Solution (2220), stir
the mixture. The characteristic color will appear immediately. Check the
color of the solution with the table of colors listed in Step 3. (If buffer
solutions are used, add 5.0 mL of the buffer solution to a cell on the stage,
add ten drops of the pH indicator and mix. Note the pH value of the
buffer solution on the side of the stage near the cell.)
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