Question

Glacial phosphoric acid is:
(A) $HP{O_3}$
(B) ${H_3}P{O_3}$
(C) ${H_3}P{O_4}$
(D) ${H_4}{P_2}{O_7}$

Answer 1

Hint : Phosphoric acid, also known as orthophosphoric acid or phosphoric (V) acid, is a weak acid with the chemical formula ${H_3}P{O_4}$ . It is normally encountered as a colourless syrup of 85% concentration in water. The pure compound is a colourless solid. All three hydrogens are acidic to varying degrees and can be lost from the molecule as ${H^ + }$ ions (protons). When all three ${H^ + }$ ions are removed, the result is an orthophosphate ion $PO_4^{3 - }$ , commonly called "phosphate". Removal of one or two protons gives dihydrogen phosphate ion ${H_2}PO_4^ -$ , and the hydrogen phosphate ion $HPO_4^{2 - }$ , respectively. Orthophosphoric acid also forms esters, called organophosphates.

Complete Step By Step Answer:
Glacial phosphoric acid is an anhydride of phosphoric acid used as a reagent, and in the manufacture of zinc oxyphosphate cement for dentistry.
$HP{O_3}$ Is known as glacial phosphoric acid. It is also known as metaphosphoric acid. It is a monobasic acid.

Additional Information:
An inorganic acid (also called a mineral acid) is an acid derived from one or more inorganic compounds. All inorganic acids form hydrogen ions and the conjugate base ions when dissolved in water. Inorganic acids range from super acids to very weak acids. Inorganic acids tend to be very soluble in water and insoluble in organic solvents.

Note :
A monobasic acid is an acid that has only one hydrogen ion to donate to a base in an acid-base reaction. Therefore, a monobasic molecule has only one replaceable hydrogen atom. Glacial phosphoric acid is an example of monobasic acid.