Question

An example for a neutral buffer is:
A.Ammonium hydroxide and ammonium chloride
B.Acidic acid and sodium acetate
C.Acidic acid and ammonium hydroxide
D.Citric acid and sodium citrate

Answer 1

Hint: Neutral buffer is a buffer solution which is produced by mixing weak acid (carbonic acid, acidic acid) and weak base (ammonia, pyridine and methylamine). Ammonium hydroxide and acetic acid are good examples of neutral buffer solutions.

Complete step by step answer:
Buffer solutions are also called pH buffer or hydrogen ion buffer and are an aqueous solution consisting of a mixture of a weak acid and its conjugate base, or vice versa. With the addition of strong or base, there is very less change in the pH. Buffer solutions have major application in keeping the pH at a nearly constant value.
Buffers are broadly divided into two types –
Acidic buffer solutions
Alkaline buffer solutions
Acidic buffer solutions have a pH below 7 and contain a weak acid and one of its salts. For example: - A mixture of two chemicals sodium acetate and acetic acid acts as a buffer solution with a pH of about 4.75.
Alkaline buffers solution has a pH above 7 and contains a weak base and one of its salts. For example: -A mixture of ammonium hydroxide and ammonium chloride acts as a buffer solution with a pH of about 9.25.
Neutral buffer solutions are formed by mixing weak acid or weak base. For example: - Ammonium hydroxide or acidic acid is an example of neutral buffer solution.
So according to the concept, the correct option is (C) acetic acid and ammonium hydroxide.

Note:
In biological systems this is an essential condition for enzymes to function correctly. For example, in human blood a mixture of carbonic acid and bicarbonate is present in the plasma fraction; this constitutes the major mechanism.