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Acids
Acids are inorganic and organic compounds that change the pH of water. Acids have a pH range of 1 to 7. Acids can be of different nature: sulphur, phosphorus, carbon, chlorine, nitrogen. Correspondingly, the names sulphonic, phosphonic, carbonic/carboxylic, nitric acids or their derivatives with the corresponding functional groups are common.
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Food uses include citric acid, malic acid, acetic acid, lactic acid, succinic acid, succinic acid, phosphoric acid and ascorbic acid.
The strongest acid in terms of acidity is hydrochloric acid and the strongest acid in terms of acidity and concentration is sulphuric acid.
Nitric, sulphuric and phosphoric acids are used to acidify the soil in the presence of an irrigation system. Oxalic (sorbic), citric acids are used in case of spreading.