The Chemical Equation:
HCl (aq) + NaOH (aq) → NaCl (aq) + H₂O (l)
Explanation:
* Reactants:
* Hydrochloric acid (HCl) is a strong acid, meaning it readily donates hydrogen ions (H⁺) in solution.
* Sodium hydroxide (NaOH) is a strong base, meaning it readily accepts hydrogen ions (H⁺) in solution and provides hydroxide ions (OH⁻).
* Products:
* Sodium chloride (NaCl) is a salt, formed by the combination of the sodium cation (Na⁺) from NaOH and the chloride anion (Cl⁻) from HCl. It dissolves in water.
* Water (H₂O) is formed by the combination of hydrogen ions (H⁺) from HCl and hydroxide ions (OH⁻) from NaOH.
What Happens in Solution:
1. Ionization: HCl and NaOH dissociate completely in water, forming ions:
* HCl → H⁺ + Cl⁻
* NaOH → Na⁺ + OH⁻
2. Neutralization: The hydrogen ions (H⁺) from the acid react with the hydroxide ions (OH⁻) from the base to form water (H₂O):
* H⁺ + OH⁻ → H₂O
3. Salt Formation: The remaining ions, sodium (Na⁺) and chloride (Cl⁻), combine to form sodium chloride (NaCl), which dissolves in water.
Key Features of the Reaction:
* Exothermic: The reaction releases heat, making the solution warmer.
* Neutralization: The reaction neutralizes the acidic and basic properties of the reactants, resulting in a solution closer to neutral pH.
* Salt Formation: The reaction produces a salt, which is a compound formed by the reaction of an acid and a base.
Practical Applications:
This reaction is used in:
* Chemical analysis: To determine the concentration of acids or bases.
* Industrial processes: To adjust the pH of solutions.
* Everyday life: In the production of soap and detergents.
