HNO3 and NaNO3 cannot form a buffered aqueous solution from the following options.
A buffer solution (more precisely, pH buffer or hydrogen ion buffer) is an aqueous solution consisting of a mixture of a weak acid and its conjugate base, or vice versa. Its pH changes very little when a small amount of strong acid or base is added to it.
Buffer solutions are used as a means of keeping pH at a nearly constant value in a wide variety of chemical applications. In nature, there are many living systems that use buffering for pH regulation. For example, the bicarbonate buffering system is used to regulate the pH of bloodstream, and bicarbonate also acts as a buffer in the ocean.
Buffer solutions resist pH change because of a chemical equilibrium between the weak acid HA and its conjugate base A−:
HA ⇌ H⁺ + A⁻
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