Chlorophyll molecule has a porphyrin ring, its magnesium ions are located in the center of the porphyrin ring, chlorophyll molecule is more unstable, in contact with acid, the central magnesium is easy to be replaced by hydrogen, in the presence of other heavy metal ions, hydrogen is also easy to be replaced by other heavy metal elements
Operation method
Experiments on the substitution of hydrogen and copper for magnesium in chlorophyll
Principle
Chlorophyll molecule has a porphyrin ring, its magnesium ions are located in the center of the porphyrin ring, chlorophyll molecule is more unstable, in contact with acid, the central magnesium is easy to be replaced by hydrogen, in the presence of other heavy metal ions, hydrogen is also easy to be replaced by other heavy metal elements
Materials and Instruments
Chloroplast pigment extract Test tube Beaker Alcohol lamp Concentrated hydrochloric acid Copper acetate crystals Move Take 5 ml of chlorophyll extract, add a drop of concentrated hydrochloric acid, stirring the solution can be seen gradually from green to brown, at this time the hydrogen in the hydrochloric acid has replaced the magnesium in the chlorophyll, the formation of magnesium chlorophyll. For more product details, please visit Aladdin Scientific website.
Take half of the de-magnesium chlorophyll solution, add a little copper acetate crystals, slowly heated, at this time the hydrogen in the de-magnesium chlorophyll was replaced by copper, turning bright green.