Question

A buffer contains significant amounts of a weak acid and a salt containing its conjugate base. The acid consumes any added base, and the base consumes any added acid. In this way, a buffer resists pH change. Strong acids, strong bases, two bases, or two acids cannot form a buffer on their own.

Part A

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

HF and KCN

HCl and KCl

NaCl and KCl

NaBr and KBr

HCOOH and HCOONa

HF and NaF

KF and KOH

please let me know Buffer or not Buffer

Answer 1

acidic buffer is formed by weak acid and salt of weak acid

basic buffer is formed by weak base and salt of weak base

a)

conjugate base of HF will be KF and not KCN

So, they will not form buffer

b)

HCl is strong acid.

So, they will not form buffer

c)

NaCl and KCl are both salt

So, they will not form buffer

d)

NaBr and KBr are both salt

So, they will not form buffer

e)

HCOOH is weak acid and HCOONa is its conjugate base

So, they will form buffer

f)

HF is weak acid and NaF is its conjugate base

So, they will form buffer

g)

KOH is strong base here

So, they will form buffer