Question

identify the acid - base reaction.
o there is no acid - base reaction.
o agno₃(aq) + nacl(aq) → agcl(s) + nano₃(aq)
o 2 hclo₄(aq) + sr(oh)₂(aq) → sr(clo₄)₂(aq) + 2 h₂o(l)
o h₂(g) + cuo(s) → cu(s) + h₂o(l)

Explanation:

Step1: Recall acid - base reaction definition

An acid - base reaction is a chemical reaction between an acid and a base to form a salt and water.

Step2: Analyze each reaction

• For \(H_{2}(g)+CuO(s)\to Cu(s)+H_{2}O(l)\), it is a redox reaction (hydrogen is oxidized and copper is reduced), not an acid - base reaction.
• For \(2HClO_{4}(aq)+Sr(OH)_{2}(aq)\to Sr(ClO_{4})_{2}(aq)+2H_{2}O(l)\), \(HClO_{4}\) (acid) reacts with \(Sr(OH)_{2}\) (base) to form a salt \(Sr(ClO_{4})_{2}\) and water. This is an acid - base reaction.
• For \(AgNO_{3}(aq)+NaCl(aq)\to AgCl(s)+NaNO_{3}(aq)\), it is a precipitation reaction (formation of \(AgCl\) precipitate), not an acid - base reaction.

Answer:

\(2HClO_{4}(aq)+Sr(OH)_{2}(aq)\to Sr(ClO_{4})_{2}(aq)+2H_{2}O(l)\)