Question

question
which of the following statements about the following reaction is true? h₂co₃ <-> h⁺ + hco₃⁻
select all that apply
the reaction indicates a dissociation of a weak acid.
buffers prevent large changes in ph.
buffers are composed of a strong acid and a strong base.
the reaction indicates that a proton can be donated or accepted.

Explanation:

1. $H_2CO_3$ is a weak acid and it dissociates into $H^+$ and $HCO_3^-$ as shown, so the statement about the dissociation of a weak - acid is true.
2. Buffers are solutions that resist large changes in pH, which is a fundamental property of buffers.
3. Buffers are composed of a weak acid and its conjugate base or a weak base and its conjugate acid, not a strong acid and a strong base.
4. In the reaction $H_2CO_3

ightleftharpoons H^++HCO_3^-$, $H_2CO_3$ donates a proton ($H^+$) to form $HCO_3^-$, so the statement about proton donation or acceptance is true.

Answer:

The reaction indicates a dissociation of a weak acid.
Buffers prevent large changes in pH.
The reaction indicates that a proton can be donated or accepted.