Hint: A buffer solution can be prepared by mixing a weak acid or base with the salt of a strong base or strong acid.
Explanation:
Sodium acetate and acetic acid in water can form buffer solution because sodium acetate is a salt of strong acid \(NaOH\) and weak acid acetic acid.
\(CH _3 COONa + CH _3 COOH\)
Sodium acetate and hydrochloric acid in water cannot form a buffer solution because \(HCl\) is a strong acid.
Ammonia and ammonium chloride in water can from buffer solution because ammonia is a weak base and ammonium chloride is a salt of ammonia and strong acid \(HCl\).
\(NH _4 Cl + NH _3\)
Ammonia and sodium hydroxide in water cannot form buffer solutions because both are bases.
(નજીકના પૂર્ણાંકમાં રાઉન્ડ ઑફ કરો) $[$આપેલ $: \sqrt{2}=1.41]$