Acetic acid (CH3COOH), also called ethanoic acid, the most important of the carboxylic acids. A dilute (approximately 5 percent by volume) solution of acetic acid produced by fermentation and oxidation of natural carbohydrates is called vinegar; a salt, ester, or acylal of acetic acid is called acetate.

True

Ethanoic acid is indeed also known as acetic acid. This is because ethanoic acid is the systematic name for the compound with the molecular formula CH3COOH, while acetic acid is the common name for the same compound.

Explanation:

What is Ethanoic Acid?
Ethanoic acid is a weak acid with the chemical formula CH3COOH. It is a colorless liquid with a strong, pungent smell and a sour taste. Ethanoic acid is an organic compound that belongs to the carboxylic acid family. It is commonly found in vinegar, which is a dilute solution of acetic acid.

What is Acetic Acid?
Acetic acid is the common name for the same compound, CH3COOH. It is derived from the Latin word "acetum," which means vinegar. Acetic acid is widely used in various industries, including food, pharmaceuticals, and chemicals. It is also used as a solvent and a reagent in many chemical reactions.

Systematic Name vs. Common Name
Chemical compounds can have both a systematic name and a common name. The systematic name is derived from the compound's structure and follows a set of rules defined by the International Union of Pure and Applied Chemistry (IUPAC). It provides a standardized way to name compounds.

On the other hand, common names are more widely recognized and are often used in everyday language. Common names are often derived from historical or traditional usage of the compound. Acetic acid is one such example where the common name is widely used instead of the systematic name, ethanoic acid.

Conclusion
In conclusion, ethanoic acid and acetic acid refer to the same compound with the molecular formula CH3COOH. Ethanoic acid is the systematic name, while acetic acid is the common name that is more commonly used in everyday language.