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Question

Write down the names of compounds represented by the following formulae: (i)Al2SO43(ii)CaCl2 (iii) K2SO4(iv) KNO3(v) CaCO3


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Solution

Chemical compound names:

  • Chemical compound names can vary from simple to highly complex.
  • There are various steps involved while naming the chemical compound.

The naming of compounds:

  • While naming it should be remembered that the name should be specific.
  • There are various steps involved while naming the compound.
  • Before naming the compound identify if it is ionic or covalent.
  • As the ionic bond is between metal and non-metal while noncovalent between two non-metals.
  • Write the first letter of metal in capital letters and non-metal in small letters.
  • The First word in the compound name should be of metal while the second of non-metal ends with “ide” or “ate”.

(i)Al2(SO4)3

  • The ions present in the compound are Aluminum ion Al3+and Sulphate ion SO42-.
  • The name of the compound will be Aluminium sulfate.
  • It is an odorless, colorless salt and sand-like solid.
  • It is used in sewage treatment, making of paper, and purification of water.
  • It is commonly known as an alum or papermaker's alum.

(ii)CaCl2

  • The ions present in the compound are Calcium ion Ca2+ and Chloride ionCl-.
  • The name of the compound will be Calcium chloride.
  • It is a white crystalline solid and is highly soluble in water.
  • It is used for dust control, additive in plastic, wastewater treatment, and on roads to protect it from damage.

(iii)K2SO4

  • The ions present in the compound are Potassium ionK+ and Sulphate ion SO42-.
  • The name of the compound will be Potassium sulfate.
  • It is also known as sulfate of potash or arcanite.
  • It is used as fertilizer as it contains both sulfur and potassium.
  • It is also used in the manufacturing of glass artillery propellant charges.

(iv) KNO3

  • The ions present in the compound are Potassium ion K+ and Nitrate ionNO3-.
  • The name of the compound will be Potassium nitrate.
  • It is also known as saltpeter or niter.
  • It is a white solid soluble in water formed by fractional crystallization.
  • It is used in gunpowder, fertilizer, and the preparation of nitric acid.

(v) CaCO3

  • The ions present in the compound are Calcium ion Ca2+ and Carbonate ionCO32-.
  • The name of the compound will be Calcium carbonate
  • It is found in rocks, aragonite, eggshells, and pearls.
  • It is used in the construction industry, purification of iron, refining of sugar, and as an extender of paints.
  • It is commonly known as Limestone.

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