Ethanol is a colorless liquid at room temperature. When a low concentration of ethanol solution is present it tastes sweet. A high concentration of ethanol solution has a burning taste (hard liquor). The chemical make up of Ethanol is CH₃CH₂OH or sometimes expressed as C₂H₆O. Ethanol is an alcohol: a group of compounds that contain a hydroxyl group. Ethanol melts at –114.3 degrees Celsius and boils at 78.4 degrees Celsius. Ethanol has a molar mass of 46.07g/mol and a density of .789g/mL at liquid state.