Which of the following solutions is a good buffer system? O A) a solution that is 0.10 M HC2H302 and 0.10 M LIC2H302 O B) a solution that is 0.10 M HF and 0.10 M NaC2H302 O c) a solution that is 0.10 M HCl and 0.10 M NH4+ OD) a solution that is 0.10 M NaOH and 0.10 M KOH

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Question:

Which of the following solutions is a good buffer system? O A) a solution that is 0.10 M HC2H302 and 0.10 M LIC2H302 O B) a solution that is 0.10 M HF and 0.10 M NaC2H302 O c) a solution that is 0.10 M HCl and 0.10 M NH4+ OD) a solution that is 0.10 M NaOH and 0.10 M KOH

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Answer:

The solution which is a good buffer system is:

(A) a solution that is 0.10 M  ?f=HC 2H 3O 2   and 0.10 M ?f=LiC 2H 3O 2

What is a Buffer solution?

It is defined as a solution that maintain the pH of the solution by adding the small amount of acid or a base. It is mainly of two types:

Acidic buffer : It is defined as the solution that have the pH less than 7 and it contains weak acid and its salt or conjugate base. For example : Acetic acid (weak acid) and sodium acetate (salt or conjugate base). Basic buffer : It is defined as the solution that have the pH more than 7 and it contains weak base and its salt or conjugate acid. For example : Ammonia (weak base) and ammonium chloride (salt or conjugate acid).

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Thus, option A is correct.

(A) a solution that is 0.10 M ?f=HC 2H 3O 2  and 0.10 M ?f=LiC 2H 3O 2

It is a mixture of weak acid and its conjugate base (salt) . So, it is a good buffer.

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