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Substance combinations that can create a buffer are combinations of a weak acid and a salt derived from that acid, or a combination of a weak base and a salt derived from that base.

We can arrive at this answer because:

  • A buffer is a substance that maintains its pH even with the addition of acidic or basic substances.
  • These substances are generally used when there is a need to maintain a constant pH.
  • In this case, in general terms, we can say that a buffer is formed by mixing a weak acid and a salt derived from that acid, or a weak base and a salt derived from that base.

A base is a substance that contains OH- in its composition and acid is a substance that contains H+ in its composition.

Regarding the strength of this base or acid, it is necessary to know what is the pH level of this substance, the farther this level is from 7 (more or less) the weaker is the base or acid.

You did not present the substances that this question refers to, which makes it impossible for me to answer it precisely, but I hope the information above can help you.

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