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Question

Write the main difference between acid and a base. With the help of suitable examples, explain the terms neutralization and the formation of i. Acidic ii.Basic iii.Neutral salts


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Solution

The main differences between an acid and a base are discussed below:

Acid

Base

  • Acids, according to Arrhenius's theory, are species that dissociate in water to produce Hydrogen ions H+.
  • Bases, according to Arrhenius's theory, are species that dissociate in water to produce Hydroxyl ions OH-.
  • According to Bronsted-Lowry theory, an acid is a substance that can donate a Hydrogen ion, H+.
  • According to Brönsted-Lowry theory, a base is a substance that can take a Hydrogen ion, H+.
  • Acid changes blue litmus to red.
  • Base changes red litmus paper to blue.
  • The pH of the acid is below 7 at 25°C.
  • The pH of the base is above 7 at 25°C.

Neutralization reaction:

  • When an acid reacts with a base, salt is formed along with water. This reaction is known as the Neutralization reaction.
  • Neutralization reactions are highly exothermic in nature. Thus, the temperature of the reaction increases.
  • General reaction can be depicted as:

Acid+BaseSalt+Water

i. Acidic salts form from the neutralization of a strong acid and a weak base.

  • When hydrochloric acidHCl reacts with ammoniaNH3, it yields Ammonium chlorideNH4Cl.
  • The chemical reaction is depicted as:

NH3(g)+HCl(aq)NH4Cl(s)

ii. Basic salts form from the neutralization of a strong base and a weak acid.

  • When acetic acidCH3COOH reacts with sodium hydroxideNaOH, it yields sodium ethanoateCH3COONa and water.
  • The chemical reaction is depicted as:

NaOH(aq)+CH3COOH(aq)CH3COONa(aq)+H2O(l)

iii. Neutralization of a strong acid and a strong base gives a neutral salt.

  • When Sodium hydroxide reacts with Hydrochloric acidHCl, it gives Sodium chlorideNaCl and water.
  • The chemical reaction is depicted as:

NaOH(aq)+HCl(aq)NaCl(s)+H2O(l)


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