Which one of the following species acts as both Bronsted acid and base?

Question

Which one of the following species acts as both Bronsted acid and base? (A) H2PO2- (B) HPO 32- (C) HPO 42- (D) All of these

Tardigrade Admin · Accepted Answer

HPO 42-+ H 2 O leftharpoons H 2 PO 4-+ OH - HPO 42-+ H 2 O leftharpoons PO 43-+ H 3 O + H 2 PO 2- is a conjugate base of H 3 PO 2 (a monobasic acid) and does not give H +, HPO 32- is a conjugate base of H 2 PO 3- and does not ionise further. Since, H 3 PO 3 is a dibasic acid.

Q. Which one of the following species acts as both Bronsted acid and base?

$H_{2} P O_{2}^{-}$

$H P O_{3}^{2 -}$

$H P O_{4}^{2 -}$

All of these

Q. Which one of the following species acts as both Bronsted acid and base?

H2​PO2−​

HPO32−​

HPO42−​

All of these

HPO42−​+H2​O⇌H2​PO4−​+OH− HPO42−​+H2​O⇌PO43−​+H3​O+ H2​PO2−​ is a conjugate base of H3​PO2​ (a monobasic acid) and does not give H+,HPO32−​ is a conjugate base of H2​PO3−​ and does not ionise further. Since, H3​PO3​ is a dibasic acid.

$H_{2} P O_{2}^{-}$

$H P O_{3}^{2 -}$

$H P O_{4}^{2 -}$