Perfect Neutralization Balance
Balance acid and base to form salt and water
What this lesson covers
Why it matters
Pour acid into alkali and they cancel each other out — releasing heat and leaving just salt and water.
The idea in plain words
Verify the stoichiometry: 1 mole of HCl reacts with 1 mole of NaOH to produce 1 mole of NaCl and 1 mole of H₂O.
Predict first
What is the only molecular product formed when HCl reacts with NaOH?
Neutralization combines H⁺ from the acid and OH⁻ from the base to form stable water molecules.
- Water (H₂O) — correct
- Hydrogen gas (H₂)
- Oxygen gas (O₂)
- Sodium Chloride gas (NaCl)
What you do
Balance the reaction: Add HCl and NaOH until the see-saw levels. Observe the formation of NaCl and H₂O.
Check yourself
Which equation correctly represents the complete neutralization of dilute sulfuric acid with excess sodium hydroxide?
Sulfuric acid is diprotic, requiring two NaOH molecules to neutralize both protons, forming sodium sulfate and two water molecules.
What observation confirms that neutralization is an exothermic process?
The reaction data for NaOH + dilute HCl notes 'heat felt: warm' — neutralisation releases energy.
In the reaction HCl + NaOH → NaCl + H₂O, what role does NaCl play?
Neutralization reactions always produce a salt (NaCl) and water (H₂O) from an acid and a base.
- 2NaOH + H₂SO₄ → Na₂SO₄ + 2H₂O — correct
- NaOH + H₂SO₄ → NaHSO₄ + H₂O
- NaOH + H₂SO₄ → Na₂SO₄ + H₂O
- 2NaOH + H₂SO₄ → Na₂SO₄ + H₂
- The solution feels warm — correct
- The solution freezes
- Bubbles of gas are released
- A precipitate forms immediately
- It is the salt product — correct
- It is the catalyst
- It is the acid
- It is the solvent