Apentix/AP Chemistry/Unit 8: Acids and Bases/Question

AP Chemistrymediummcq1 pt

Ca(OH)₂ dissolves only sparingly in water, yet it is classified as a strong base. Why?

A.Because its saturated solution is highly concentrated

B.Because whatever amount dissolves dissociates essentially completely

C.Because it partially ionizes like a weak base

D.Because strength depends on how much solid remains undissolved

Explanation

Core Concept

Base strength describes the fraction of dissolved base present as ions, not the amount that dissolves. Every Ca(OH)₂ unit that enters solution releases two OH⁻ essentially quantitatively, so the dissolved portion behaves as fully ionized. Low solubility caps how basic the mixture can get without changing the classification.

Correct Answer

BBecause whatever amount dissolves dissociates essentially completely

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