Which of the following is a buffer?

Question

Which of the following is a buffer? (A) NH 4 OH + NH 4 Cl (B) NaOH + Na 2 SO 4 (C) NaOH + CH 3 COONa (D) K 2 SO 4+ H 2 SO 4

Tardigrade Admin · Accepted Answer

A solution with reserve acidity or basicity is known as buffer.
These are of two types
(i) Acidic buffer solution A mixture of weak acid and its salt with strong base.
Example :

C H_{3} COO H + C H_{3} COON a

.
(ii) Basic buffer solution

A

mixture of weak base and its salt with strong acid.
Example

N H_{4} O H + N H_{4} Cl

N H_{4} O H + N H_{4} Cl

is a basic buffer because it is a mixture of weak base and its salt with strong acid.

N a O H + N a_{2} S O_{4}

and

N a O H + C H_{3} COON a

are not buffer because in these mixture strong base is present.

K_{2} S O_{4} + H_{2} S O_{4}

is not a buffer due to the presence of strong acid.

Q. Which of the following is a buffer?

NH4​OH+NH4​Cl

NaOH+Na2​SO4​

NaOH+CH3​COONa

K2​SO4​+H2​SO4​

$N H_{4} O H + N H_{4} Cl$

$N a O H + N a_{2} S O_{4}$

$N a O H + C H_{3} COON a$

$K_{2} S O_{4} + H_{2} S O_{4}$