Buffer Solution HELP Watch

PleaseHelpAsap
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Can anyone please explain to me why the answer is D? Thanks a lot.

Which pair of compounds, in aqueous solution, could be used to make a buffer solution?
A. CHCOOH and HCl
B. HCl and NaOH
C. HCl and NHCl4
D. HCOOH and NaOH
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charco
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(Original post by PleaseHelpAsap)
Can anyone please explain to me why the answer is D? Thanks a lot.

Which pair of compounds, in aqueous solution, could be used to make a buffer solution?
A. CHCOOH and HCl
B. HCl and NaOH
C. HCl and NHCl4
D. HCOOH and NaOH
a buffer solution consists of a weak acid (or weak base) in a solution with its salt.

You can make a buffer solution in two ways:

1. Physically mixing appropriate quantities of the weak acid (or base) and its salt.
2. Reacting a weak acid (base) with fewer moles of strong base (acid).
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