Question

What is a double decomposition reaction? Give an example each for neutralization and precipitation reactions.

Answer 1

Double decomposition reaction: It is the type of reaction in which the two reactants exchange their ions and result in the production of two new products.

Example: HCl(aq) + NaOH(aq) $\to$NaCl(aq) + H₂O(l)

HCl is hydrochloric acid.

NaOH is a sodium hydroxide base.

NaCl is sodium chloride.

H₂O is water.

Neutralization reaction: It is the type of reaction in which an acid and a base react to form salt and water.

These are types of double displacement reactions.

Example : H₂SO₄(aq) + 2NaOH(aq) $\to$Na₂SO₄ (aq) +2H₂O

H₂SO₄ is a sulphuric acid.

NaOH is a sodium hydroxide base.

Na₂SO₄ is a sodium sulfate salt.

H₂O is water.

Precipitation reaction: It is the type of reaction in which insoluble salt is formed because of the reaction between two reactants.

These are also types of double displacement reactions.

Example: Pb(NO₃)₂(aq) + 2NaI(aq)$\to$PbI₂(s)+2NaNO₃ (aq)

Pb(NO₃)₂ is a lead nitrate solution.

NaI is sodium iodide solution.

PbI₂ is a lead iodide obtained in form of a precipitate.

NaNO₃ is a sodium nitrate solution.