THIS USER ASKED 👇

Select the statement that best describes a buffer. view available hint(s) select the statement that best describes a buffer. a buffer prevents the ph of a solution from changing when an acid or base is added. buffered solutions are always neutral, with a ph of 7. a buffer stabilizes the ph of a solution by preventing acids or bases from dissociating. a buffer causes acidic solutions to become alkaline, and alkaline solutions to become acidic. a buffer resists change in ph by accepting hydrogen ions when acids are added to the solution and donating hydrogen ions when bases are added.

THIS IS THE BEST ANSWER 👇

Buffer is best described as a buffer: Buffer withstands a change in pH by accepting hydrogen ions when acids are added to the solution and by donating hydrogen ions when bases are added.

Why?

A buffer is a solution made up of either:

Weak acid (HA) and its conjugate base (A⁻). Weak base (B) and its conjugate acid (HB⁺)

The purpose of a buffer is to resist changes in pH when an acid or solid base is added to the solution.

If the buffer is composed of HA and A⁻ and a strong acid (eg HCl) is added, the buffer absorbs hydrogen ions in the following way:

A⁻ + HCl → HA + Cl⁻

If a solid base (eg NaOH) is added, the buffer grants hydrogen ions in the following way:

HA + NaOH → NaA + H₂O

The pH of the buffer can be obtained at any given moment by using the Henderson-Hasselbach equation, based on the equilibrium HA + H₂O ⇄ H₃O⁺ + A⁻

pH = pKa + log  frac {[A^{-}] } {[HA]}

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