Question
Asked Feb 9, 2020
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Which set of compounds would form a buffer in aqueous solution? I am having a hard time understanding how to create a buffer, so an explanation and example would be great. Thanks!

Buffer Solutions
Which set of compounds would form a butfer in aqueous solution?
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Buffer
Not a buffer
Nacl and NaOH
НсооН and HCОOK
HCN and KCN
NaBr and KBr
HCN and NaF
HBr and NaBr
Nacl and KCI
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Buffer Solutions Which set of compounds would form a butfer in aqueous solution? Drag each item to the appropriate bin. • View Available Hint(s) Reset Help Buffer Not a buffer Nacl and NaOH НсооН and HCОOK HCN and KCN NaBr and KBr HCN and NaF HBr and NaBr Nacl and KCI

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Step 1

Buffer solutions are the solutions that resist a change in pH on dilution or on addition of small amounts of acid or base.

Buffers can either be prepared by mixing a weak acid with its conjugate base or a weak base with its conjugate acid.

 

Buffer solutions are mainly divided into two types – acidic and basic buffer solutions.

Acidic buffers are solutions that have a pH below 7 and contain a weak acid and one of its salts. For example, a mixture of acetic acid, CH3COOH (weak acid) and sodium acetate, CH3COONa (salt of its conjugate base, CH3COO-) acts as a buffer solution with a pH of about 4.75.

Basic buffers, on the other hand, have a pH above 7 and contain a weak base and one of its salts. For example, a mixture of ammonium hydroxide, NH4OH (weak base) and ammonium chloride, NH4Cl (salt of its conjugate acid, NH4+) acts as a buffer solution with a pH of about 9.25. 

Step 2

The given solutions are :

NaBr and KBr :

Here, both NaBr and KBr are salts and they are neutral. Therefore, NaBr and KBr cannot form a buffer solution.

 

HCN and NaF :

Here, HCN is a weak acid but NaF is not the salt of its conjugate base (CN-). Therefore, HCN and NaF cannot form a buffer solution.

 

HBr and NaBr :

Here, HBr is a strong acid. Therefore, HBr and NaBr cannot form a buffer solution.

 

NaCl and NaOH :

Here, NaOH is a strong base. Therefore, NaCl and NaOH cannot form a buffer solution.

 

HCN and KCN :

...

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