In the following dissociation reaction. Identify the conjugate acid-base pairs i

Question

In the following dissociation reaction. Identify the conjugate acid-base pairs in these reactions:1) HC2H3O2 + H2O = H3O+ + C2H3O2- a) The reactant HC2H3O2 is acting as _________and its conjugate (either acid or base) is _____________. b) The reactant H20 is acting as ________and its conjugate (either acid or base) is _____________. 2) NH4+ (aq) + OH- (aq) = NH3 (aq) + H2O (l) -identify conjugate acid-base pairs 3) HBR (aq) + H2O (l) = H30 + (aq) + Br- (aq) -identify conjugate acid-base pairs. 3) CO3 2- (aq) + H2O (l) = HCO3- (aq) + OH-(aq) - identify conjugate acid-base pairs

Explanation / Answer

According to bronstead and lowry theory , any species formed in a chemical reaction by receiving a proton (H+) is called Conjugate acid, and that which remains after losing proton is Conjugate base. thus HA (acid) + FB (base) ----- HF (conjugate acid) + AB (conjugate base). Unlike arrehinius theory bronstead theory relates to every species and not only actual acids and bases, so H2O and other neutral species also acts as base or acid.

To identify look for the species on product side where H+ is added as this is conjugate acid, hence the other is conjugate base.

1. The reactant HC2H3O2 is bronstead weak acid and it's conjugate base is C2H3O2- (b) the reactant H2O is acting as base and conjugate acid is H3O+.

2. H+ proton is added to OH-, so NH3 is conjugate base and H2O conjugate acid.

3. Proton from HBr is added to H2O , so H2O is conjugate acid and Br- conjugate base.

4. HCO3- is conjugate acid and OH- is becomes conjugate base.

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