Question

reactions involving acids

na₂co₃(aq) + hcl(aq)
naoh(aq) + hcl(aq)

Explanation:

Step1: Analyze the reaction \(Na_{2}CO_{3}(aq)+HCl(aq)\)

The reaction between sodium carbonate \((Na_{2}CO_{3})\) and hydrochloric acid \((HCl)\) is \(Na_{2}CO_{3}(aq)+2HCl(aq)=2NaCl(aq)+H_{2}O(l)+CO_{2}(g)\). The formation of \(CO_{2}\) gas causes bubbles in the mixture.

Step2: Analyze the reaction \(NaOH(aq)+HCl(aq)\)

The reaction between sodium hydroxide \((NaOH)\) and hydrochloric acid \((HCl)\) is \(NaOH(aq)+HCl(aq)=NaCl(aq)+H_{2}O(l)\). This is a neutralization reaction which is exothermic, so the test - tube feels hotter.

Answer:

For \(Na_{2}CO_{3}(aq)+HCl(aq)\):

• Observations after mixing: Bubbles formed in mixture
• Products: \(CO_{2}(g)\), \(H_{2}O(l)\), \(NaCl(aq)\)

For \(NaOH(aq)+HCl(aq)\):

• Observations after mixing: Test tube felt hotter
• Products: \(H_{2}O(l)\), \(NaCl(aq)\)