Introduction to Acids and Bases

AP Chemistry· difficulty 2/5

Schematic representation of solute species in two acid solutions of equal concentration.

strong (HCl) H+ Cl- H+ Cl- weak (HF) HF HF HF H+ F-

What does the figure illustrate about the two acids?

  • A

    HF ionizes completely; HCl only partially

  • B

    Both acids ionize completely

  • C

    HCl ionizes completely; HF only partially

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  • D

    Neither ionizes appreciably

Explanation

A strong acid (HCl) shows essentially only ions in solution; a weak acid (HF) is dominated by intact molecules with only a small amount of ions, illustrating partial ionization.

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