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Question

What will you observe when an excess of NaOH solution is added to a zinc sulphate solution?


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Solution

  • A white precipitate of zinc hydroxide is obtained.
  • ZnSO4+ 2NaOH Zn (OH)2 + Na2SO4
  • Being amphoteric, zinc hydroxide dissolves in excess of NaOH .
  • It forms a complex of sodium zincate .
  • Zn (OH)2+ 2NaOH Na2ZnO2 +H2O
  • While adding excess sodium hydroxide to white precipitate, a sodium zincate complex is formed

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