Question

What does a buffer do?

A. It prevents a salt from forming in solution.
B. It prevents an acid-base reaction from happening.
C. It prevents an acid or base from being neutralized.
D. It resists a change in pH when H+ or OH- is added to a solution.

Answer 1

A?

Answer 2

no really

Answer 3

a buffer in chemistry is a solution that resists changes in pH when acid or alkali is added to it. Buffers typically involve a weak acid or alkali together with one of its salts.

Answer 4

So it's D?

Answer 5

Yes dear!!
http://chemwiki.ucdavis.edu/Physical_Chemistry/Acids_and_Bases/Buffers