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

question 31

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

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Definitions:

Thallium Poisoning

A toxic condition resulting from exposure to thallium, a heavy metal that can lead to severe health issues like hair loss, neurological damage, and even death.

Ionic Compound

Ions combined through the strength of electrostatic attractions to form a chemical compound, in a process called ionic bonding.

Sodium

A soft, silvery-white, highly reactive metal and an essential element in animal nutrition, symbolized as Na.

Nitrogen

A colorless, odorless, tasteless gas that constitutes about 78% of the Earth's atmosphere; it is a critical element in the makeup of amino acids, proteins, and nucleic acids.