Multiple Choice
In the context of acid-base equilibrium, which of the following factors can disrupt the Hardy-Weinberg equilibrium?
3. Acids and Bases
Acid Base Equilibrium
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In the context of acid-base equilibrium, what does a pKa value of 4.75 indicate about the strength of an acid?
A
The acid is weak and partially dissociates in water.
B
The acid is neutral and does not dissociate in water.
C
The acid is strong and completely dissociates in water.
D
The acid is very weak and does not dissociate at all.
Verified step by step guidance1
Understand that pKa is a measure of the strength of an acid. It is the negative logarithm of the acid dissociation constant (Ka).
Recall that a lower pKa value indicates a stronger acid, as it implies a higher Ka value, meaning the acid dissociates more in water.
Recognize that a pKa value of 4.75 is relatively low compared to neutral water (pKa ~ 7), but higher than strong acids like HCl (pKa < 0).
Conclude that an acid with a pKa of 4.75 is considered a weak acid, as it partially dissociates in water, but not completely.
Understand that weak acids do not fully dissociate in water, which is why they have a pKa value greater than 0 but less than 7.
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