Chemistry Regents Practice Test 2025 – The All-in-One Guide to Exam Success!

Question: 1 / 400

Which defines a strong base?

Partially dissociates in solution

Releases hydroxide ions in small quantities

Completely dissociates in solution to produce OH-

A strong base is defined as a substance that completely dissociates in solution to produce hydroxide ions (OH-). This process occurs when the base is added to water; the molecules separate entirely into their constituent ions. For instance, sodium hydroxide (NaOH) fully dissociates in water into sodium ions (Na+) and hydroxide ions (OH-).

This complete dissociation leads to a significant increase in hydroxide ion concentration, which is what contributes to the high pH and strong alkaline nature of the solution. Understanding this property is crucial for distinguishing between strong bases and weak bases, where weak bases only partially dissociate, resulting in a lower concentration of hydroxide ions in solution.

The other options present characteristics that either describe weak bases or do not accurately represent the behavior of strong bases.

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Reacts with acids to form salts only

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