Definition of phosphoric acid in US English:

phosphoric acid


  • A crystalline acid obtained e.g. by treating phosphates with sulfuric acid, used in fertilizer and soap manufacture and food processing.

    A tribasic acid; chemical formula: H₃PO₄

    • ‘The pair had been polishing off rough edges of metal from the inside of the stainless steel cylinder using an electro-plating process of pumping electricity through a solution of sulphuric acid and phosphoric acid.’
    • ‘To give food a light texture, and/or control its acidity/alkalinity, yeast, sodium bicarbonate, citric acid, fumaric acid, phosphoric acid, lactic acid, and tartrates may be added.’
    • ‘If the alcohol (with the exception of methanol) is heated with aluminum oxide, phosphoric acid or excess sulphuric acid, an alkene is formed along with a molecule of water.’
    • ‘There are four main-types of fuel cells, classified by the type of electrolytes that produce the chemical process: phosphoric acid, proton-exchange membrane, sulfuric acid and molten carbonate.’
    • ‘The alloy also resists sulfuric acid and pure phosphoric acid.’


phosphoric acid

/fɑsˌfɔrɪk ˈˌæsəd/