What is a Neutralization Reaction?
Neutralization is when an acid and base react to form salt and water, releasing heat. The H⁺ from the acid combines with OH⁻ from the base to make H₂O.
Acid + Base → Salt + Water + Heat. Example: HCl + NaOH → NaCl + H₂O. The H⁺ and OH⁻ cancel, forming water and a neutral ionic compound.
- 1↓1. Acid (H⁺ source)HCl dissociates
- 2↓2. Base (OH⁻ source)NaOH dissociates
- 3↓3. H⁺ + OH⁻Form water H₂O
- 44. Salt + HeatNaCl product, exothermic
Step-by-step worked examples
Write the neutralization: H₂SO₄ + 2 NaOH → ?
H₂SO₄ + 2 NaOH → Na₂SO₄ + 2 H₂O 2 H⁺ + 2 OH⁻ → 2 H₂O
HNO₃ + Ca(OH)₂ → ?
2 HNO₃ + Ca(OH)₂ → Ca(NO₃)₂ + 2 H₂O Ionic: 2 H⁺ + 2 OH⁻ → 2 H₂O
Burning stomach from excess acid — how does antacid work?
Stomach acid (HCl) + antacid base (e.g. CaCO₃) → salt + water Neutralization removes the H⁺ burning sensation
Flashcards
Quick quiz
Q1.HCl + NaOH products?
Q2.Ionic equation of neutralization?
Q3.Is neutralization exothermic?
Q4.Antacid works by…
The full card deck, worked steps and AI-tutor support for “What is a Neutralization Reaction?” are in Notek — study by hand before your exam.
Common mistakes
Neutralization produces only salt. — Correct: It produces salt AND water and releases heat.
A neutral pH solution has no ions. — Correct: Neutral pH (7) has equal H⁺ and OH⁻, but salt ions present.
All neutralizations absorb heat. — Correct: They release heat (exothermic).
You need equal volumes of acid and base. — Correct: Stoichiometry depends on the acid and base strengths.
FAQ
Why is neutralization exothermic?
Water formation (H⁺ + OH⁻ → H₂O) releases energy from strong bonds.
Can you neutralize a strong acid with a weak base?
Yes, but you need more of the weak base (more moles) to balance.
What is a salt in chemistry?
An ionic compound from acid–base neutralization. Example: NaCl, CaSO₄, NH₄Cl.
Real-world neutralization examples?
Antacids (HCl + base), baking soda + vinegar, wastewater treatment.