What type of compound typically releases hydrogen ions (H+) in a solution?

The correct answer is acids because they are defined by their ability to donate hydrogen ions (H+) when dissolved in water. This release of hydrogen ions is what gives acids their characteristic properties, such as a sour taste and the ability to conduct electricity in solution. The presence of H+ ions also influences the pH of the solution, making it more acidic.

In contrast, bases are compounds that typically accept hydrogen ions or release hydroxide ions (OH-) in solution, which results in a higher pH. Salts generally form from the neutralization reaction of an acid and a base and can dissociate into their respective ions but do not specifically release H+ ions. Esters are organic compounds formed from the reaction of an alcohol and a carboxylic acid, and they do not function as acid or base liberators in a typical aqueous environment.