Phosphoric acid is a substance with the chemical formula H3PO4. It is a relatively weak acid compound, which belongs to the category of oxoacids. It is classified as additive E-338. It is a clear, slightly yellowish liquid, with a crystalline appearance and a relative density of 1.83, boiling point at 212°C (413.6°F), and melting point at 42.35°C (108.23°F).
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