Sodium ethoxide (C2H5ONa) is an organic compound that exists as a white solid at room temperature. However, when dissolved in certain solvents such as ethanol, it forms a liquid solution known as sodium ethoxide liquid. This liquid solution is commonly used as a strong base in organic synthesis and various chemical reactions.

Sodium ethoxide is formed by reacting metallic sodium (Na) with ethanol (C2H5OH) in a controlled environment. The reaction produces sodium ethoxide and hydrogen gas (H2). The resulting sodium ethoxide can then be dissolved in a suitable solvent, typically ethanol, to form the liquid solution.

Sodium ethoxide liquid is highly reactive due to the presence of the strong base, ethoxide ion (C2H5O-). It is often used as a reagent in organic chemistry for various transformations such as deprotonation, condensation reactions, and alkoxide substitutions. It is particularly useful in reactions involving the formation of carbon-carbon (C-C) and carbon-heteroatom (C-X, where X is a heteroatom like oxygen, nitrogen, etc.) bonds.

When handling sodium ethoxide liquid, it is important to take necessary precautions as it is corrosive and can cause severe burns. It should be stored in a tightly sealed container away from moisture and air to prevent its degradation.