Objectives:
Objectives:
• to collect data and ID 5 different white powders based upon physical and chemical properties.
• to analyze data and use a flow chart
Procedure: DO NOT TASTE ANY POWDERS ! ! !
• Test ONLY 1 POWDER at a TIME, & thoroughly clean your test surface each time
• Place a small amount of powder on test surface/area: you will have four teeny tiny piles
• Use toothpicks to mix the indicators with the powder.
• Be sure to wipe off surface completely before moving onto the next powder.
Physical properties & pH box:
• Record the properties of the powder such as color, texture, crystal or powder.
• Add 1-3 drops of water. Test the pH with indicator litmus paper. Look at the color chart on the roll to match the color and get the pH number: 0-6 acidic, 7 neutral, 8-14 basic.
Biuret test box :
• Add 1-2 drops of Biuret. If protein is present, it will turn purple.
• Record results in Table 1.
Iodine test box:
• Add 2-3 drops of Iodine. If starch is present, it will turn blue/black/purplish, record results in Table 1
Vinegar test box :
• Add 2 drops of Vinegar.
• If it fizzes, then CO2 has been released.
• Record results in Table 1.
SAMPLE: Data: Table 1 : Results of Tests on Powders (whole page)
|Test |A |
|Iodine Test |Vinegar Test |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
|Add 2-3 drops of Iodine. Stir. | |
|Color change = Starch present |Add 2 drops of Vinegar. Stir. |
|*Safety : It stains and is poisonous* |Reaction = CO2 released |
Forensic Science Names:_________________________
Find the Poison Data Sheet Pd:_____ Dates:_________________
Data: Table 1 : Results of Tests on Powders (whole page)
|Mystery |A |B |C |D |E |
|Color |Ivory |White | White |White |White |
|Texture |any |any |any |any |any |
|Crystal / Powder |Crystal |Powder |Crystal |Powder |Powder |
|pH |Can be Slightly Acidic |Base |Neutral |Neutral |Neutral |
|Biuret |Purple |Blue |Blue |Blue |Blue |
|Vinegar |No |Yes |No |No |Yes |
|Iodine |No |No |No |Black |Black |
Analysis & Results :
[pic]
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Lab Instructions:
Do not write on this paper
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