Cabbage juice contains anthocyanidin, which is a sugar
molecule attached to a cyanin molecule.
Cyanidin acts as a pH indicator because it changes color when it gains or loses H+ ions.
Color change is based on the wavelength of light that a molecule will absorb.
When the electrons of a compound are confined to one position, the wavelengths of light needed to jump energy levels are high energy. When there are many resonance structures that give the elrctrons options, then the wavelengths don’t need to be so high energy. Blue light absorption is associated with confined electrons and red light absorption with free movement.
If the cyanidin is in acidic solution and takes up the H+ ions, the wavelength absorbed by the compound will be blue, and as a result the color refracted, which we observe, will be red. If the cyanidin is in basic solution, and the H+ ions are taken from the cyanidin compound, the color we observe will be blue.
Cyanidin acts as a pH indicator because it changes color when it gains or loses H+ ions.
Color change is based on the wavelength of light that a molecule will absorb.
When the electrons of a compound are confined to one position, the wavelengths of light needed to jump energy levels are high energy. When there are many resonance structures that give the elrctrons options, then the wavelengths don’t need to be so high energy. Blue light absorption is associated with confined electrons and red light absorption with free movement.
If the cyanidin is in acidic solution and takes up the H+ ions, the wavelength absorbed by the compound will be blue, and as a result the color refracted, which we observe, will be red. If the cyanidin is in basic solution, and the H+ ions are taken from the cyanidin compound, the color we observe will be blue.
If there were to be acid rain on a red cabbage patch, the
cabbage would become more red.
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