NATS 1870 Lecture Notes - Lecture 9: Sodium Bicarbonate, Litmus, Chemiluminescence
21 Jan 2019
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Bleach: removes colour: colour molecules are broken as the bleach molecules break the bonds in a chemical reaction. Sometimes new molecules are created: the original molecule is broken apart completely, dye molecules ends up in fragments and do not absorb visible light any more; all light wavelengths are reflected and therefore we perceive white. Sometimes bonds are broken so molecules are just changed: modify energy level spacings of dye molecule, by changing the dye molecule structure, adding or subtracting atoms, no longer absorbs visible light, experiment. Create a dye solution using red food dye and water. Individual dye molecules disperse through the water. The red dye will disappear, but the colour has not been removed. Milk: these have different behaviours in water solutions, the degree of acidity is measured by the potency of hydrogen - ph. Ph 1-6: acidic (lots of h+ ions)
