12 Questions
Which pair of substances forms a buffered aqueous solution?
H3PO4 and NaH2PO4
What is the purpose of the Henderson-Hasselbalch equation?
To calculate the pH of a buffered solution
What is the name of the effect that occurs when a compound containing an ion in common with a dissolved substance is added to a solution at equilibrium?
Common ion effect
What is the pH of a solution prepared by mixing 500 mL of 0.10 M NaOCl and 500 mL of 0.20 M HOCl?
7.19
Which of the following is the conjugate acid of NH3?
NH4+
Which of the following is the best choice for preparing a buffer with a pH of 3.5?
C6H4(COOH)2, Ka = 2.9 × 10–4
What happens to the pH of a solution when sodium acetate is added to a solution of acetic acid?
The pH increases
In a buffer solution, which component/resists the change in pH when small amounts of acid or base are added?
The conjugate acid
What happens to the percentage of ionization when a strong acid is added to a weak acid?
The percentage of ionization decreases
What effect does dilution have on a buffer solution's ability to resist changes in pH?
Dilution weakens the buffer's ability
If a strong base is added to a buffered solution, what will happen to the pH of the solution?
The pH remains the same
What is the consequence of having a buffer solution where the concentrations of the weak acid and its conjugate base are equal?
The buffer solution becomes ineffective
Explore the effects of adding sodium acetate and sodium formate to solutions of acetic acid and formic acid respectively on the acid-base equilibria. Test your understanding of how these compounds influence the equilibrium position and concentrations of ions.
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