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Note on Salt

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A salt is a compound formed by the partial or complete neutralization of an acid by a base. Some salt are salty while most of them taste bitter. Sodium chloride, Potassium chloride, calcium chloride, calcium sulphate, etc. are some examples of salts.

Properties of salts

  1. Some salts are salty in taste, but most of the salts are bitter in taste.
  2. Salts normally do not cause any change in the color of indicators like litmus paper, methyl orange, and phenolphthalein.
  3. Some salts are white while some salts are colored.
  4. Most of them are soluble in water.

Preparation of salts

Salts can be prepared in many ways. Some methods of preparing salts are given below:

  1. The reaction between an acid and a base: Common salt (NaCl) can be prepared by the reaction of sodium hydroxide with hydrochloric acid.
    NaOH + HCl → NaCl + H2O
  2. The reaction between an acid and a metal: A metal displaces hydrogen from an acid to form a salt.
    Zn + 2HCl → ZnCl2 + H2
    Mg + 2HNO3 → Mg (NO3)2 + H2
  3. Reaction between a metal oxide or another salt with and acid
    ZnO + H2SO4 → ZnSO4 + H2O
  4. By a direct combination of metals and non-metals
    2Na + Cl2 → 2NaCl

Some salts and their uses are given below:

S.N Salts Uses
1. Sodium chloride As edible salts (table salt, rock salt)
2. Copper sulphate As insecticides
3. Magnesium sulphate Used in constipation
4. Calcium sulphate Plastering fractured bones, in the manufacture of chalk.

  • A salt is a compound formed by the partial or complete neutralization of an acid by a base. A salt is a neutral substance. It does not have acidic and basic properties.
  • Some salts are salty in taste but most of the salts are bitter in taste.
  • Salts do not cause any change in the color of indicators like litmus paper, methyl orange and phenolphthalein.
  • Some salts are white while some salts are colored.
  • Most of them are soluble in water.
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Very Short Questions

The properties of salt are as follows:

  • Some salts are salty whereas the other are bitter or tasteless.
  • Most of the salts are neutral to indicators.
  • Most of the salts are soluble in water. The salts of lead and barium are insoluble in water.
  • The solution of salt can conduct electricity.

Indicator is defined as the chemical compounds used for identifying whether a given substance is acidic or basic in nature.
Salt is a compound formed by partial or complete replacement of hydrogen of an acid by a metal.
Water soluble metallic oxides of bases are called alkalis.

Sodium carbonate – Na2CO3
Sodium chloride – NaCl
Aluminum hydroxide – Al(OH)3
Potassium hydroxide – KOH
Sulphuric acid – H2SO4

Calcium sulphate – It is used as insecticide.
Magnesium sulphate – It is used for reducing constipation.
Aluminum hydroxide – It is used as medicine to get rid of gastric.

Sulphuric acid (H2SO4) is a compound which gives hydrogen ion and sulphate ion in solution state.
Methyl orange is changed into red colour after treating with this compound. H2SO4 +2NaOH → Na2SO4 + H2O

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  • The neutral substance formed by the reaction between acidic radical and basic radical is known as ______ .

    none of these
    acid
    salt
    base
  • Salt is prepared by ______ .

    all the answers are right
    reaction between a metal oxide or another salt with an acid
    reaction between an acid and a base
    reaction between an acid and a metal
  • Color of salts ______.

    are colorless


    depend on type of salt


    are red in color


    are white in color


  • Which of the following does not change the colors of any indicator?

    all of these change colors
    salts
    acids
    bases
  • Which of these reactions can produce a salt?

    all of the answers are correct


    combination reaction


    neutralization reaction


    displacement reaction


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