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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