Question

Which of the following best describes acid anhydrides?

When hydrogen chloride is dissolved, the polar bond between hydrogen and chlorine allows the hydrogen to separate from the chlorine.

Aqueous solutions that contain acids are able to conduct an electric current because of the presence of electrolytes, or ions.

When a strong base like sodium hydroxide is dissolved, large amounts of heat are released because the process is exothermic.

When carbon dioxide (CO2) is dissolved in water, carbonic acid (H2CO3) is formed. The carbonic acid acts as an acid by giving off hydrogen ions to water.

Answer 1

Carbon anhydride forms carbonic acid:
CO₂ + H₂O ⇄ H₂CO₃ ⇄ H⁺ + HCO₃⁻
HCO₃⁻ ⇄ H⁺ + CO₃²⁻

⇒4. When carbon dioxide (CO₂) is dissolved in water, carbonic acid (H₂CO₃) is formed. The carbonic acid acts as an acid by giving off hydrogen ions to water.

Answer 2

When carbon dioxide (CO2) is dissolved in water, carbonic acid (H2CO3) is formed. The carbonic acid acts as an acid by giving off hydrogen ions to water

Step-by-step explanation:

The fourth option is the only one related with acid anhydrides. An anhydride is obtained by the elimination of water from another compound.

When carbon dioxide (CO2) is dissolved in water, carbonic acid (H2CO3) is formed as follows:

CO2 + H2O <-> H2CO3

The carbonic acid acts as an acid by giving off hydrogen ions to water as follows:

H2CO3 <-> HCO3- + H+

HCO3- <-> CO3- + H+