Which of the following will function as buffer? (1) NaCl °+ NaOH (2) Borax + Boric acid (3) NaH 2 PO 4+ NaHPO 4 (4) NH 4 Cl + NH 4 OH

Question

Which of the following will function as buffer? (1) NaCl °+ NaOH (2) Borax + Boric acid (3) NaH 2 PO 4+ NaHPO 4 (4) NH 4 Cl + NH 4 OH (A) 1, 2 and 3 are correct (B) 1 and 2 are correct (C) 2 and 4 are correct (D) 1 and 3 are correct

Tardigrade Admin · Accepted Answer

Buffer is a mixture of a weak acid/weak base and its conjugate base/conjugate acid. eg, borax (conjugate base) + boric acid (weak acid), NH 4 Cl (conjugate acid) + NH 4 OH (weak base).

Q. Which of the following will function as buffer?
(1) $N a C l^{\circ} + N a O H$
(2) Borax $+$ Boric acid
(3) $N a H_{2} P O_{4} + N a H P O_{4}$
(4) $N H_{4} Cl + N H_{4} O H$

1, 2 and 3 are correct

1 and 2 are correct

2 and 4 are correct

1 and 3 are correct

Buffer is a mixture of a weak acid/weak base and its conjugate base/conjugate acid. eg, borax
(conjugate base) $+$ boric acid (weak acid),
$N H_{4} Cl$ (conjugate acid) $+ N H_{4} O H$ (weak base).

Q. Which of the following will function as buffer? (1) NaCl∘+NaOH (2) Borax + Boric acid (3) NaH2​PO4​+NaHPO4​ (4) NH4​Cl+NH4​OH