Question 30

Bases or alkaline solutions are known as hydrogen acceptors.

Bases or alkaline solutions are characterized by their ability to accept protons (H⁺ ions), which is why they are referred to as hydrogen acceptors.

A) Hydrogen acceptors

This option is correct because bases are defined by their capacity to accept hydrogen ions from acids, thus increasing the pH of a solution. This fundamental property is a core aspect of acid-base chemistry.

B) Solutions of low pH

This option is incorrect because solutions of low pH are acidic, not basic. Bases typically have a high pH, often above 7, which is contrary to what this option suggests.

C) Hydrogen donors

This option is incorrect as it describes acids rather than bases. Hydrogen donors release protons into a solution, which is the opposite of the behavior exhibited by bases.

D) Amphoteric

This option is partially correct but does not accurately define bases universally. Amphoteric substances can act as both acids and bases, but not all bases are amphoteric. Thus, this definition is too broad to specifically describe alkaline solutions.

Conclusion

The correct answer, hydrogen acceptors, precisely identifies the role of bases in acid-base chemistry, distinguishing them from acids and other types of substances. All other options either mischaracterize bases or apply to different chemical concepts, reinforcing that A is the definitive correct choice.