Question

reactions involving acids
reactants appearance of
reactants observations after mixing
(select all that apply) products
(select all that apply)
no observable change no reaction occurred
bubbles formed in mixture co₂(g)
mixtures color changed h₂co₃(aq)
solid formed in mixture h₂co₃(g)
test tube felt colder h₂o(aq)
test tube felt hotter h₂o(l)
nacl(aq)
na₂cl(aq)
na₂co₃(aq) + hcl(aq) the chemicals mixed
together created a
boiling mixer

Explanation:

Step1: Write the chemical reaction equation

$$\text{Na}_2\text{CO}_3(aq)+2\text{HCl}(aq) ightarrow 2\text{NaCl}(aq)+\text{H}_2\text{O}(l)+\text{CO}_2(g)$$

This is an acid - carbonate reaction. Carbonates react with acids to produce salt, water, and carbon dioxide.

Step2: Analyze the reaction observations

• Bubbles formed: Because $\text{CO}_2$ gas is produced as shown in the reaction equation.
• Test tube felt hotter: Acid - carbonate reactions are exothermic (release heat).

Step3: Analyze the reaction products

• $\text{NaCl}(aq)$: From the reaction equation, sodium chloride is formed in aqueous solution.
• $\text{H}_2\text{O}(l)$: Water is a product of the reaction.
• $\text{CO}_2(g)$: Carbon dioxide gas is evolved as per the reaction.

Answer:

Observations after mixing: Bubbles formed in mixture, Test tube felt hotter
Products: $\text{CO}_2(g)$, $\text{H}_2\text{O}(l)$, $\text{NaCl}(aq)$