Friday, February 2, 2007
Colours

The theme of our set of photographs is Colours.



The Rainbow Colours

Red --- Adding Universal indicator to Hydrochloric Acid (HCl).
Orange --- Potassium Dichromate (K2CR2O7).
Yellow --- Iron(II) Chloride (FeCl2.
Green --- Adding distilled water to Universal indicator.
Blue --- Copper(II) Sulphate (CuSO4.
Indigo --- Concentrated Potassium Permanganate (KMnO4).
Violet --- Adding distilled water to Potassium Permanganate (KMnO4).



Diffusion of colours

The colourless liquid in the beaker is water while the purple is Concentrated Potassium Permanganate (KMnO4). The rate of diffusion is slow due to the high concentration of KMnO4.



Colours of Salts

Starting from left, clockwise:
Orange: Potasium Dichromate K2Cr2O7
White: Sodium Carbonate Na2CO3
Yellow: Potassium Chromate K2CrO4
Black: Potassium Manganate (VII) KMnO4
Light Blue: Copper Sulphate CuSO4.5H2O
Blue Green: Iron(II) Sulphate FeSO4.7H2O
Grey: Manganese Dioxide MnO2
Light Yellow: Sulphur powder
Greenish Blue: Copper(II) Acetate Cu(CH3COO)2.H20
Very Light Green: Copper(II) Carbonate CuCO3
Maroon: Cobalt Chloride CoCl2.6H2O
Blue: Copper(II) Nitrate Cu(NO3)2 . 2.5 H20



Graffiti

The yellow is Lead(II) Iodide, against the black top of our secondary school's Chemistry Lab table.



Layers of Ppt

Yellow: Lead(II) Iodide.
White: Barium Hydroxide.
Blue ppt: Copper(II) Hydroxide.
Light blue solution: Copper(II) Sulphate.
Dark blue solution: Complex ion.



Brown Fumes

This is concocted by adding Concentrated Nitric Acid to copper foil. Nitrogen Dioxide is produced.



Colours of Chromatography

Solvent used: Ethanol.

Group members: Gillian, Chunying, Layjia, Meigui.
Many thanks to our secondary school, Anderson Secondary, for providing the facilities and the chemicals and Miss Patricia Goh, for her unremitting help rendered to us even though we've graduated from the school.