Question

question 1
which of the following statements about the following reaction is true? h₂co₃ <--> h⁺ + hco₃⁻
select all that apply
□ buffers are composed of a strong acid and a strong base.
□ buffers prevent large changes in ph.
□ the reaction indicates a dissociation of a weak acid.
□ the reaction indicates that a proton can be donated or accepted.

Explanation:

1. 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. So the first statement is false.
2. Buffers resist large changes in pH by reacting with added acids or bases. This is a fundamental property of buffers, so the second statement is true.
3. $H_2CO_3$ is a weak acid, and the given reaction $H_2CO_3

ightleftharpoons H^++HCO_3^-$ shows its dissociation, so the third statement is true.

1. In the reaction $H_2CO_3

ightleftharpoons H^++HCO_3^-$, $H_2CO_3$ can donate a proton ($H^+$) and $HCO_3^-$ can accept a proton, so the fourth statement is true.

Answer:

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