Key chemical properties
The two hydroxyl groups on CBD grant it the ability to act as a hydrogen bond donor and acceptor, however there is not enough polarity in the molecule to dissolve in polar solvents such as water. CBD is soluble in organic solvents ethanol, methanol, dimethyl sulfoxide and dimethyl formamide. Conveniently, CBD is also soluble in liquid carbon dioxide - which is an environmentally friendly solvent commonly used in the manufacturing of CBD. The melting point of CBD is 66 celsius, henceforth CBD is a crystalline solid at room temperature. The boiling point is 180 celsius (while the boiling point of THC is 157). Consequently, the vaporization temperature has to be kept at a high temperature (greater than 180 degrees celsius) for those using vaporisation as a medication option, in order for CBD to be transformed into the gaseous state and enter the lungs.
Cannabidiol absorbs light in the ultraviolet region and has absorption peaks at 209 and 275 nm respectively. The two peaks are a characteristic of phenolic compounds, and as CBD is a terpenophenolic compound it consequently has maximal absorption of light at those two peaks. When CBD is exposed to light, an electron is promoted highest occupied molecular orbital (HOMO) to the lowest unoccupied molecular orbital (LUMO). As CBD shows two peaks in its UV spectrum, two electron transitions are taking place. The energy of the two electron transitions is proportional to the wavelength of light, according to the equation derived by the founder of theoretical physics - Max Planck.
The colour of any object is determinant on the wavelength of light the object absorbs, transmits and more importantly reflects. As pure CBD crystals are white in colour, it can be deduced that it reflects all the colours of the visible light spectrum (400nm to 700nm) - as white light is the combination of all the different wavelengths of light.