Can’t Judge a Powder. Consistency Be consistent with: The size of the sample The volume of water or any other liquid added Perhaps, the container for.

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Can’t Judge a Powder by Its Color

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Presentation transcript:

Can’t Judge a Powder

Consistency Be consistent with: The size of the sample The volume of water or any other liquid added Perhaps, the container for testing

Proper usage of pH paper Cut into small pieces that will fit into container for testing Do not place pH paper in a solution – Use the tip of a stirring rod to spot a small piece of pH paper Read pH immediately

Testing Various Powders Across each spot plate Water, 1M HCl, 1M NaOH, 2- propanol(isopropyl alcohol), methanol First column: pH paper Second column: 2 drops Ca(NO3)2 2 drops Ba(NO3)2 2 drops AgNO3

Conductivities *Always test solution of the powder in water (aqueous) A solution showing conductivity A solution showing little conductivity