In this exercise we dissolved a small amount of solid CoCl$26$H$2$O separately in distilled water and in the ethanol and obtained pink and dark blue solutions respectively. a$)$Give a chemical formulae for CoCl$26$H$2$O taking into account that all water molecules are in the first coordination sphere. Give dissociation equation for this salt. Which ions are responsible for colour of water solution of this salt? b$)$A coordination number of Co$2+$ changes in a presence of ethanol $($complex ion loses two water molecules$).$ Write chemical equation.