Predict the products formed from the following gas evolution equation.
NH₄Cl (aq) + NaOH (aq) →

• A. NH₄Cl (aq) + NaOH (aq) → NH₄OH (aq) + NaCl (aq)
• B. NH₄Cl (aq) + NaOH (aq) → NH₃ (g) + H₂O (l) + NaCl (aq)
• C. NH₄Cl (aq) + NaOH (aq) → NH₄OH (g) + NaCl (s)
• D. No reaction

Answer: (B)

Verified step by step guidance

1. Identify the reactants in the given chemical equation: NH4Cl (aq) and NaOH (aq). These are ammonium chloride and sodium hydroxide, both in aqueous solution.
2. Consider the possible reactions between the reactants. Ammonium chloride can react with sodium hydroxide to form ammonium hydroxide (NH4OH) and sodium chloride (NaCl).
3. Recognize that ammonium hydroxide (NH4OH) is unstable in aqueous solution and decomposes into ammonia gas (NH3) and water (H2O). This is a key step in predicting the products of the reaction.
4. Write the balanced chemical equation for the decomposition of ammonium hydroxide: NH4OH (aq) → NH3 (g) + H2O (l). This shows the formation of ammonia gas and water.
5. Combine the decomposition step with the initial reaction to predict the overall products: NH4Cl (aq) + NaOH (aq) → NH3 (g) + H2O (l) + NaCl (aq). This equation represents the gas evolution reaction, where ammonia gas is evolved.