To correctly represent the amount of weak-acid dissociation for the hydrochloric

Question

To correctly represent the amount of weak-acid dissociation for the hydrochloric acid after the hydrochloric acid is added, we should use the calculation for the Choices: Degree of ionization, Percent ionization, Fraction of dissociation, the pH, the pOH A buffer is diluted to 25% of its initial strength with water. What happens to the buffer capacity? Choices: The buffer capacity will decrease to one-quarter. The buffer capacity will decrease to one-half. The buffer capacity will increase by adding one-quarter. The buffer capacity will increase by adding one-half. The buffer capacity will remain the same as before.

Explanation / Answer

Q29.

Calculation for the fraction of dissociation of the acid

Since we will need to account for:

Ka = [H+][A-]/[HA]

then, H+ =H+ from strong acid + H+ from weak acid

Q30

Buffer capacity will remain the same, since there exist the SAME amount of moles in solution,

If we talk about concentration, then the capacity will be reduced by 1/4, i.e. 0.25 --< 1/4

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