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Phosphoric acid (orthophosphoric acid, monophosphoric acid or phosphoric(V) acid) is a colorless, odorless phosphorus-containing solid, and inorganic compound with the chemical formula H 3 P O 4.
A tribasic, or triprotic acid, containing three potential protons to donate; A tribasic salt, with three hydrogen atoms, with respect to the parent acid, ...
This acid is diprotic (readily ionizes two protons), not triprotic as might be suggested by this formula. Phosphorous acid is an intermediate in the preparation of other phosphorus compounds. Organic derivatives of phosphorous acid, compounds with the formula RPO 3 H 2, are called phosphonic acids.
3), a triprotic acid. It forms orthophosphate salt and esters, commonly called phosphates. The smallest compounds of this class with two or more phosphorus atoms are called "oligophosphoric acids", and the larger ones, with linear –P–O– backbones, are "polyphosphoric acids"; with no definite separation between the two.
Citric acid is a triprotic acid, with pK a values, extrapolated to zero ionic strength, of 3.128, 4.761, and 6.396 at 25 °C. [21] The pK a of the hydroxyl group has been found, by means of 13 C NMR spectroscopy, to be 14.4. [22] The speciation diagram shows that solutions of citric acid are buffer solutions between about pH 2 and pH 8. In ...
Phosphate is the conjugate base of phosphoric acid, which is produced on a massive scale for use in fertilisers. Being triprotic, phosphoric acid converts stepwise to three conjugate bases: H 3 PO 4 + H 2 O ⇌ H 3 O + + H 2 PO 4 − K a1 = 7.25×10 −3 H 2 PO 4 − + H 2 O ⇌ H 3 O + + HPO 4 2− K a2 = 6.31×10 −8
When one molecule of base via complete ionization produces three hydroxide ions, the base is said to be triacidic or triprotic. Examples of triacidic bases are: Examples of triacidic bases are: Aluminium hydroxide , ferrous hydroxide , Gold Trihydroxide , [ 18 ]
The compound is a triprotic acid with acid dissociation constants pK a1 = 1.1, pK a2 = 5.5 and pK a3 = 12.8. In aqueous solutions it slowly undergoes hydrolysis to hydrogen peroxide and phosphoric acid. [7] H 3 PO 5 + H 2 O → H 3 PO 4 + H 2 O 2. With excess water, the hydrolysis can be considered pseudo-first order.