The larger the value of Ka

Question

BlackTom AI · Accepted Answer

When evaluating the relationship between acid strength and the acid dissociation constant Ka, it helps to recall the definition of Ka and what it implies about dissociation in solution.
Option 1: 'the more highly dissociated the acid and the stronger the acid.' This is correct because Ka measures the extent to which an acid donates protons in water. A larger Ka indicates a greater degree of dissociation, which corresponds to a stronger acid.
Option 2: 'the less highly dissociated the acid and the stronger the acid.' This contradicts the fundamental idea that stronger acids dissociate more in solution. Less dissociation would imply a weaker acid, not stronger.
Option 3: 'the less highly dissociated the acid and the weaker the acid.' While this statement correctly links less dissociation with weaker acids, it misstates the primary relationship being asked about: a weaker acid does not have a larger Ka. Thus this option is incorrect.
Option 4: 'the more highly dissociated the acid and the weaker the acid.' This mixes up the correlation: high dissociation should align with strong acids, not weaker ones, so this is inconsistent with Ka concepts.
In summary, the core idea is that Ka increasing reflects greater dissociation and greater acid strength, so the option that aligns both ideas is the one stating that more dissociation corresponds to a stronger acid. The other choices invert or misapply this relationship, leading to false conclusions.

The larger the value of Ka单项选择题

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