What is vinegar ?

- Chemical
Vinegar is the third stage of life in a sugar molecule. When sugar ferments or ages, it becomes alcohol. When alcohol ferments or ages it becomes vinegar.
The common chemical name of vinegar is acetic acid because the primary components besides water for vinegar is acetic acid.
 
Vinegar is a versatile liquid that results from the fermentation of ethanol, so it is also known as ethanoic acid under the more formal IUPAC naming convention of organic molecules (though "acetic acid" is also accepted by IUPAC). It's molecular formula is: CH3COOH
 
- Ingredients
The main ingredient of vinegar is acetic acid that make it taste acidic. The concentration varies and typically ranges from 4 to 8 percent by volumne, for table vinegar is typically 5%, for pickling can up to 18%.
Natural vinegars also contain small amounts of tartaric acid, citric acid, and other acids. The typical PH of vinegar ranges from 2 to 3.5, the store-bought kind usually measures 2.4.
Vinegar also contains some vitamins and minerals from the starting material.