Neutralization Reaction

Neutralization Reaction

What is a neutralization reaction

Definition:

A neutralization reaction can be defined as a chemical reaction in which an acid and base quantitatively react together to form a salt and water as products. In a neutralization reaction, there is a combination between H+ ions and OH ions which forms water. A neutralisation reaction is generally an acid base neutralization reaction.

Relation between strength of reactants and resultant pH

Depending upon the strength of the constituent acids and bases the pH of the products varies.

Strength of Acid

Strength of Base

Resultant pH

Strong

Strong

7

Strong

Weak

< 7

Weak

Strong

> 7

Weak

Weak

If,

Ka>Kb => pH < 7

Ka=Kb => pH = 7

Ka<Kb => pH > 7

Neutralization reaction equation

acid + base(alkali) → salt + water

Neutralization Reaction

Neutralization reaction examples

  • Formation of Sodium Chloride (Common Salt):
    HCl + NaOH → NaCl + H2O
  • Titration methods using phenolphthalein.

Application of neutralization reaction

  • Titration methods: The method of chemical titration is employed to find unknown concentrations of acids or bases by finding their neutralization point. To find the point where the neutralization happens, we use a pH indicator or pH meter. With the help of simple stoichiometric calculations and knowledge of the volume and molarity of the known quantity, the molarity of the unknown particle can be found out.
  • Wastewater treatment: Most of the waste that come in the form of industrial effluents have their fair share of toxicity which will be harmful for our environment. Thus we need to neutralize their toxicity before they can be thrown out. Based on the application, different chemicals are used. Some common examples are:
    • Sodium Bicarbonate
    • Magnesium Hydroxide
    • Calcium Oxide
    • Calcium Carbonate
  • Nanomaterial synthesis: To facilitate the chemical reduction of metal precursors, the heat of a neutralization reaction is used.
  • In our digestive systems: When food is moved between our stomach and intestines, the food needs to be neutralized. But for nutrients to be absorbed through the intestine walls an alkaline environment is required. An antacid bicarbonate is produced to create this favourable condition.
  • Controlling soil pH: For optimal plant growth in any soil, there are certain conditions which are required. Some examples of materials mixed in soil to neutralize it from acidity are:
    • Calcium Carbonate ( Limestone )
    • Calcium Hydroxide( Slaked lime )

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