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Question

Does colour change occur in a double displacement reaction?


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Solution

Double displacement reaction:

  • Those reactions in which two compounds react by an exchange of ions to form two new compounds are called double displacement reactions.
  • Double displacement reactions typically result in the formation of a product that is a precipitate.

For example: When ferric oxide reacts with hydrogen chloride, it will form ferric chloride as a precipitate (represented by a downward arrow) and water.

Double displacement reaction in which colour change take place.

Fe2O3sFerricoxide+6HCllhydrogenchloride2FeCl3sferricchloride+3H2Olwater

  • A double replacement reaction may or may not be resulting in a colour change.
  • From the above reaction, the ferric oxide is red-brown in colour and hydrogen chloride is colourless but after the reaction, the precipitate of ferric chloride formed is a black colour compound.

Double displacement reaction in which colour change does not take place.

For example, This is a precipitation reaction: CaSO4 is the formed precipitate. CaCl2 and Na2SO are white in colour and form white solid CaSO precipitate and NaCl crystals.

CaCl2(aq)+Na2SO4(aq)CaSO4(s)+2NaCl(aq)calciumsodiumcalciumsodiumchloridesulphatesulphatechloride

Therefore no colour change occurred.


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