The statement that best describes a buffer is: <u>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.</u>
Why?
A buffer is a solution made by combining either:
- A weak acid (HA) and its conjugate base (A⁻).
- A weak base (B) and its conjugate acid (HB⁺)
The purpose of a buffer is to resist changes in pH when a strong acid or base is added to the solution.
If the buffer is composed of HA and A⁻ and a strong acid (e.g. HCl) is added, the buffer <u>accepts hydrogen ions</u> in the following way:
A⁻+HCl → HA+Cl⁻
If a strong base (e.g. NaOH) is added, the buffer donates hydrogen ions in the following way:
HA + NaOH → NaA + H₂O
The pH of the buffer at any given moment can be found by using the Henderson-Hasselbach equation, based on the equilibrium HA + H₂O ⇄ H₃O⁺ + A⁻
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The correct answer for this question is that the most likely of the
answers is an object with 0 weight. Everything in our known universe has
mass, and whilst when we are on earth things cannot have zero weight
because of the force of gravity, that same could not be said if an
object that has previously had weight is put in an environment with zero
gravity.
Water molecules slow down until they begin to bond together.
...........................................Yes this is true
Answer:
Melting: the substance changes back from the solid to the liquid. Condensation: the substance changes from a gas to a liquid. Vaporization: the substance changes from a liquid to a gas. Sublimation: the substance changes directly from a solid to a gas without going through the liquid phase.
Explanation: