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Chapter 18: Q74E (page 1045)

Write equations showing the stepwise ionization of phosphorous acid.

Short Answer

Expert verified

Phosphorous acid, \({H_3}P{O_3}\) is a diprotic acid containing two protons that can be ionised.

Step by step solution

01

Definition of H3PO3

  • Phosphorous acid is a chemical substance with the formula H3PO3.
  • This acid is diprotic, not triprotic, as the formula might suggest.
  • Phosphorous acid is a chemical substance that is used to make other phosphorus compounds.
02

Determine the ionization of phosphorous acid.

Phosphorous acid, \({H_3}P{O_3}\) is a diprotic acid that isn't very strong. The ionisation reactions that result from the loss of the two protons occur in a stepwise way, as shown below:

\(\begin{array}{l}{H_3}P{O_3} \leftrightarrow {H^ + } + {H_2}PO_3^ - \\{H_2}PO_3^ - \leftrightarrow {H^ + } + HPO_3^{2 - }\end{array}\)

As a result, \({H_3}P{O_3}\)is a diprotic acid containing two ionisable protons.

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(a) \({\rm{Na}}{{\rm{H}}_2}{\rm{P}}{{\rm{O}}_3}\)

(b) \({\rm{P}}{{\rm{F}}_5}\)

(c) \({{\rm{P}}_4}{{\rm{O}}_6}\)

(d) \({{\rm{K}}_3}{\rm{P}}{{\rm{O}}_4}\)

(e) \({\rm{N}}{{\rm{a}}_3}{\rm{P}}\)

(f) \({\rm{N}}{{\rm{a}}_4}{{\rm{P}}_2}{{\rm{O}}_7}\)

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