When a Small Amount of HCl or NaOH Is Added

question 162

Multiple Choice

When a small amount of HCl or NaOH is added to a solution of Na2HPO4, the pH of the solution barely changes. Based on these observations, all of the following are true concerning the compound Na2HPO4, except

• A) Na2HPO4 is able to accept extra hydrogen ions from the HCl.
• B) Na2HPO4 is able to donate hydrogen ions to the OH- from NaOH.
• C) Na2HPO4 adsorbs excess H+ and OH- directly onto the surface of its crystalline structure.
• D) Na2HPO4 is a salt formed from reacting a strong base with a weak acid.
• E) Na2HPO4 acts as a buffer.

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