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You can prepare a buffer solution by combining equal moles of which pair of substances?

A. weak acid and its conjugate base
B. strong acid and a strong base
C. strong base and its conjugate acid
D. salt and a weak acid

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Answer:

A. weak acid and its conjugate base

Explanation:

A buffer solution can be made with a weak acid and conjugate base or a weak base and conjugate acid.

This may help you:

https://chem.libretexts.org/Bookshelves/Physical_and_Theoretical_Chemistry_Textbook_Maps/Supplemental_Modules_(Physical_and_Theoretical_Chemistry)/Acids_and_Bases/Buffers/Introduction_to_Buffers

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