A mixturc of a weak acid (say acctic acid) and its salts...

$A$ mixturc of a weak acid (say acctic acid) and its salts with a strong basc (say sodium acetate) acts as a buffcr solution. Which other pair has similar properties? (1) IICl and $\mathrm{NaCl}$ (2) $\mathrm{NaOII}$ and $\mathrm{NaNO}_{3}$ (3) KOII and KCl (4) $\mathrm{NII}_{4} \mathrm{OII}$ and $\mathrm{NII}_{4} \mathrm{Cl}$

$A$ mixturc of a weak acid (say acctic acid) and its salts with a strong basc (say sodium acetate) acts as a buffcr solution. Which other pair has similar properties?
(1) IICl and $\mathrm{NaCl}$
(2) $\mathrm{NaOII}$ and $\mathrm{NaNO}_{3}$
(3) KOII and KCl
(4) $\mathrm{NII}_{4} \mathrm{OII}$ and $\mathrm{NII}_{4} \mathrm{Cl}$

Key Concepts

Buffer Solution

A buffer solution is a system that minimizes changes in pH when small amounts of acid or base are added. It typically consists of a weak acid and its conjugate base (or a weak base and its conjugate acid), which work together to neutralize additions of acid or base, thereby maintaining a relatively stable pH.

Weak Acid

A weak acid only partially dissociates in solution, meaning that it does not completely separate into its ions. This incomplete ionization establishes an equilibrium between the undissociated acid and its ions, which is essential for the buffering action because it allows the system to respond dynamically to pH changes.

Conjugate Base

The conjugate base is the species formed when a weak acid donates a proton. In a buffer system, the conjugate base, usually provided by a salt of the weak acid combined with a strong base, is present in equilibrium with the weak acid. This pair collaborates to absorb added hydrogen ions or hydroxide ions, thereby resisting changes in pH.

Henderson–Hasselbalch Equation

The Henderson–Hasselbalch equation provides a mathematical relationship that relates the pH of a buffer solution to the pKa of the weak acid and the ratio of the concentrations of the conjugate base to the weak acid. This equation is an essential tool for designing buffer solutions and predicting how the pH will change in response to variations in this ratio.

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