Question

The following are 1.0 M acid solution, which has the largest concentration of hydronium [H3O+]?

A. HNO2

B. H2CO3

C. H2SO4

D. H3BO3

Answer 1

Answer: Option (C) is the correct answer.

Step-by-step explanation:

An acid which is able to dissociate completely into ions in water is known as a strong acid.

For example,
`H_(2)SO_(4) \rightleftharpoons 2H^(+) + SO^(2-)_(4)`

Therefore, sulfuric acid is a strong acid as it dissociates completely into ions in water.

Whereas
`HNO_(2)`,
`H_(2)CO_(3)`, and
`H_(3)BO_(3)` are all weak acids as they dissociates slightly in water as follows.

`H_(3)BO_(3) \rightleftharpoons H^(+) + H_(2)BO^(-)_(3)`

`HNO_(2) \rightleftharpoons H^(+) + NO^(-)_(2)`

`H_(2)CO_(3) \rightleftharpoons H^(+) + H_(2)CO^(2-)_(3)`

Morover, sufuric acid upon dissociation is giving 2 hydrogen ions and rest all are giving one hydrogen ion.

Thus, we can conclude that out of the given options
`H_(2)SO_(4)` has the largest concentration of hydronium [H3O+].

Answer 2

H2SO4 has the largest concentration of hydronium [H3O+] because H2SO4 is a strong acid.