Question

Which will make basic buffer ?
(1) 50 mL of 0.1 M NaOH + 25 mL of 0.1 M CH₃COOH
(2) 100 mL of 0.1M CH₃COOH + 100 mL of 0.1M NaOH
(3) 100 mL of 0.1 M HCl + 200 mL of 0.1 M NH₄OH
(4) 100 mL of 0.1 M HCl + 100 mL of 0.1 M NaOH

Answer 1

The following mixture forms basic buffer.

$\bold{100\,ml\,of\,0.1M\,HCl+200\,ml\,of\,0.1M\,NH_{4}OH}$

Correct answer - 3

Step by step explanation:

• A buffer solution is one which resists changes in pH when small quantities of an acid or an alkali are added to it.

• A buffer solution contains a mixture of weak acid and its conjugate base.
• Buffer solution has salt and weak base.
• Among the given option salt ($NH_{4}OH$) and weak base (HCl).

The reaction between salt and weak base as follows.

$\bold{NH_{4}OH+HCl\rightarrow NH_{4}Cl+H_{2}O+NH_{4}OH}$

Hence correct option is -3

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