Question

The species that can form both conjugate acid and conjugate base among the following is (a) H2O (b) BF3 (c) HCL (d) CO2

Answer 1

Answer:

option A

Explanation:

water losses one hydrogen to form OH- ion and also it gains hydrogen to formH3O+

Answer 2

Answer:

Option a) $H_2O$

Explanation:

Conjugate base is formed when a compound loses a proton.

So $H_2{O}$ loses a proton to form $OH^-$ .

$H_2{O {\longrightarrow} H^{+} + OH^{-}$

Conjugate acid is formed when a compound gains a proton.

$H_2{O} + H^{+} {\longrightarrow} H_3{O^+}$

So $H_2O$ gains a proton to form $H_3O^+$

While $BF_3$ doesn't have any proton to lose to form a conjugate base but it can gain a proton due to its incomplete octet to form $HBF_3^-$

$HCl$ can lose proton to form $Cl^-$ as its conjugated base but can't gain a proton to form conjugated acid

$CO_2$ also doesn't have any protons to lose so doesnot form a conjugated base.