Question

Which set of compounds would form a buffer in aqueous solution? NaBr and KBr KF AND...

Which set of compounds would form a buffer in aqueous solution?

NaBr and KBr

KF AND KOH

HCl and KCl

HCN and KCN

HCOOH and HCOOK

HF and KCl

NaCl and KCl

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Homework Answers

Answer #1

A buffer must be a weak acid and its conjugate base or

A weak base and its conjugate acid.

note: combination with strong acid or strong base could not be a buffer.

NaBr and KBr

Both NaBr and KBr are neutral salts. so not a buffer

KF AND KOH

KOH is a strong base. so not a buffer

HCl and KCl

HCl is strong acid and KCl is a neutral salt. so not a buffer

HCN and KCN

HCN is a weak acid and KCN is the conjugate base of HCN. It is a buffer solution

HCOOH and HCOOK

HCOOH is a weak acid and HCOOK is a conjugate base of HCOOH. So it is called buffer

HF and KCl

KCl is a neutral salt. so it is not a buffer

NaCl and KCl

Both are neutral salts. so not a buffer

Answer is

HCN and KCN

HCOOH and HCOOK

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