A) For the following reaction, K > 1. Classify each of the reactants and products based on their strength as Bronsted-Lowry acids or bases.

C9H7N + HNO2Doublearrow.GIFC9H7NH+ + NO2-

a) HNO2 1) stronger acid

b) NO2- 2) weaker acid

c) C9H7NH+ 3) stronger base

d) C9H7N 4) weaker base

B)
For the following reaction, K < 1. Classify each of the reactants and products based on their strength as Bronsted-Lowry acids or bases.

C5H11NH+ + C6H5COO-Doublearrow.GIFC5H11N + C6H5COOH

a) C5H11NH+ 1) strongest acid

b) C6H5COO- 2) stongest base

c) C5H11N 3) weakest acid

d) C6H5COOH 4) weakest base

According to Bronsted-Lowry acids or base theory , the reagent capable of giving hydrogen ion or proton will be acid and that which accepts hydrogen ion or proton will be base .

C₉H₇N + HNO₂ ⇄ C₉H₇NH⁺ + NO₂⁻

If K > 1 , reaction is proceeding from left to right .

Hence HNO₂ is giving H⁺ or proton and C₉H₇N is accepting proton to form

C₉H₇NH⁺ .

Hence HNO₂ is bronsted acid and C₉H₇N is bronsted base .

B )

when K < 1 , reaction above proceeds from right to left . That means

C₉H₇NH⁺ is giving H⁺ so it is a bronsted acid and NO₂⁻ is accepting H⁺ so it is a bronsted base .

Hence , NO₂⁻ is a bronsted base and C₉H₇NH⁺ is a bronsted acid .