Which statement best describes a weak acid?

Question

BlackTom AI · Accepted Answer

To start, let's lay out what the question is asking: identify the statement that best describes a weak acid.
Option 1: 'Weak acids are not highly concentrated.' This is a common misconception. The strength of an acid (weak vs strong) refers to degree of ionization in water, not its concentration. A weak acid can be concentrated or dilute; concentration and strength are separate properties.
Option 2: 'Weak acids are not dangerous, since they are weak.' This is misleading and unsafe. Even weak acids can be hazardous in terms of chemical burns or reactions; 'weak' refers to ionization, not to overall danger or hazard.
Option 3: 'Weak acids do not completely ionize.' This aligns with the fundamental definition: weak acids only partially ionize in solution, establishing an equilibrium between undissociated acid and ions, unlike strong acids which ionize completely.
Option 4: 'All of these are correct.' Since options 1 and 2 contain inaccuracies or misleading generalizations, this cannot be true.
In summary, the key concept is the ionization behavior: weak acids establish an equilibrium and do not fully ionize in aqueous solution, which makes Option 3 the correct description. The other statements either confuse strength with concentration or attribute unsafe generalities to 'weak' acids.

Which statement best describes a weak acid?单项选择题

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