A 010 M Solution of a Weak Monoprotic Acid Has a a Hydronium-Ion

question 19

Multiple Choice

A 0.10 M solution of a weak monoprotic acid has a hydronium-ion concentration of 4.6 $\times$ 10^-4 M.What is the acid-ionization constant,K_a,for this acid?

• A) 2.1 \(\times\) 10^-2
• B) 3.2 \(\times\) 10^-3
• C) 4.6 \(\times\) 10^-4
• D) 2.1 \(\times\) 10^-6
• E) 5.5 \(\times\) 10^-5

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Definitions:

Selye

Hans Selye was a pioneering Hungarian-Canadian endocrinologist who introduced the concept of stress into medical and scientific terminology.

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The selfless concern for the well-being of others, often leading to acts of kindness without expectation of reward.

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A hormone, such as cortisol, that is released into the body in response to stress, affecting the body in various ways.

Cortisol

A steroid hormone released by the adrenal glands in response to stress or low blood-glucose concentration; it plays a key role in the body's stress response.