Identify each pair that could form a buffer. (a) NaOH and NaCl (b) NaOH and NH3 (c) Na3 PO4 and

step 1 So the main principle of a buffer system is to resist changes in pH. So that would mean you have

Identify each pair that could form a buffer. (a) NaOH and...

Identify each pair that could form a buffer.
(a) $\mathrm{NaOH}$ and $\mathrm{NaCl}$
(b) $\mathrm{NaOH}$ and $\mathrm{NH}_{3}$
(c) $\mathrm{Na}_{3} \mathrm{PO}_{4}$ and $\mathrm{Na}_{2} \mathrm{HPO}_{4}$

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Key Concepts

Buffer Solutions

Buffer solutions are mixtures designed to resist changes in pH when small amounts of acid or base are added. They usually consist of a weak acid and its conjugate base or a weak base and its conjugate acid, allowing the components to neutralize added H+ or OH? ions through reversible reactions in the equilibrium system.

Conjugate Acid-Base Pairs

A conjugate acid-base pair refers to two chemical species that differ by a single proton. In the context of buffers, having a conjugate acid with its corresponding base (or vice versa) allows the system to maintain pH stability through equilibrium adjustments when acids or bases are introduced.

Weak vs. Strong Acids and Bases

In constructing effective buffers, it is crucial to choose weak acids or weak bases because they do not fully dissociate in solution, unlike strong acids or bases. This partial dissociation provides the reversible reaction needed to absorb added H+ or OH? ions, thereby stabilizing the pH of the solution.

Buffer Capacity and pH Range

Buffer capacity refers to the amount of acid or base that a buffer can neutralize without a significant change in pH. The optimal pH range for a buffer is typically around the pKa (or pKb) value of the weak acid (or base), where the equilibrium between the acid and base is most effective in resisting changes in pH.

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