Editing Acid (section)

===In industry===
Acids are fundamental reagents in treating almost all processes in modern industry. Sulfuric acid, a diprotic acid, is the most widely used acid in industry, and is also the most-produced industrial chemical in the world. It is mainly used in producing fertilizer, detergent, batteries and dyes, as well as used in processing many products such like removing impurities.<ref>{{Cite web|title = The Top 10 Industrial Chemicals - For Dummies|url = http://www.dummies.com/how-to/content/the-top-10-industrial-chemicals.html|website = dummies.com|access-date = 2016-02-05}}</ref> According to the statistics data in 2011, the annual production of sulfuric acid was around 200 million tonnes in the world.<ref>{{Cite web|title = Sulfuric acid|url = http://www.essentialchemicalindustry.org/chemicals/sulfuric-acid.html|website = essentialchemicalindustry.org|access-date = 2016-02-06}}</ref> For example, phosphate minerals react with sulfuric acid to produce [[phosphoric acid]] for the production of phosphate fertilizers, and [[zinc]] is produced by dissolving zinc oxide into sulfuric acid, purifying the solution and electrowinning.

In the chemical industry, acids react in neutralization reactions to produce salts. For example, [[nitric acid]] reacts with [[ammonia]] to produce [[ammonium nitrate]], a fertilizer. Additionally, [[carboxylic acid]]s can be [[Esterification|esterified]] with alcohols, to produce [[ester]]s.

Acids are often used to remove rust and other corrosion from metals in a process known as [[pickling (metal)|pickling]]. They may be used as an electrolyte in a [[wet cell battery]], such as [[sulfuric acid]] in a [[car battery]].