Respuesta :
Buffer is a substance that reacts with an acid or a base to control pH. Hence, option A is correct.
What is pH?
pH is a measure of how acidic/basic water is.
Buffers are solutions that resist a change in pH after adding an acid or a base. Buffers contain a weak acid (HA) and its conjugate weak base (A−).
Hence, option A is correct.
Learn more about pH here:
https://brainly.com/question/27945512
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