When a Small Amount of Hydrochloric Acid (HCl) Is Added

question 65

Multiple Choice

When a small amount of hydrochloric acid (HCl) is added to a solution of Na₂HPO₄, the pH of the solution does not change markedly. The pH also does not change drastically when a small amount of sodium hydroxide (NaOH) is added to this same solution. Based on these observations, the compound Na₂HPO₄ is:

• A) acting as a buffer
• B) acting as a solvent
• C) able to donate hydrogen atoms to HCl
• D) able to remove hydrogen ions from the OH− of NaOH
• E) an enzyme facilitating the reaction between HCl and NaOH

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Definitions:

Information Processing

A theory describing the mental processes involved in the perception, storage, and manipulation of information.

Conscious Processing

The mental activities that involve awareness and attention in the processing of information.

Unconscious Processing

The mental activities of which individuals are not aware but that influence emotions, judgments, and behaviors.

Insomnia

A sleep disorder characterized by difficulty falling asleep, staying asleep, or obtaining restorative sleep, leading to daytime impairment.