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

question 47

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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