Precipitation Reactions Experiment
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Questions and Answers

What color precipitate is formed when ferrous sulphate reacts with sodium hydroxide?

  • Gelatinous white
  • Pale blue
  • Reddish brown
  • Dirty green (correct)

    • Which chemical reaction results in the formation of a gelatinous white precipitate?

  • ZnSo4 + 2NaOH → Na2SO4 + Zn(OH)2↓ (correct)
  • FeCl3 + 3NaOH → 3NaCl + Fe(OH)3↓
  • FeSO4 + 2NaOH → Na2SO4 + Fe(OH)2↓
  • CuSO4 + 2NaOH → Na2SO4 + Cu(OH)2↓

    • Which chemical reaction represents the formation of a pale blue precipitate?

  • ZnSo4 + 2NaOH → Na2SO4 + Zn(OH)2↓
  • FeSO4 + 2NaOH → Na2SO4 + Fe(OH)2↓
  • FeCl3 + 3NaOH → 3NaCl + Fe(OH)3↓
  • CuSO4 + 2NaOH → Na2SO4 + Cu(OH)2↓ (correct)

    • What is the chemical formula for the reddish brown precipitate formed when ferric chloride reacts with sodium hydroxide?

    <p>Fe(OH)3</p> Signup and view all the answers

    Which combination of chemicals does not result in the formation of a precipitate?

    <p>Ferric chloride + sodium hydroxide</p> Signup and view all the answers

    What is the purpose of adding sodium hydroxide solution to the various chemicals in the precipitation reactions?

    <p>To form a precipitate</p> Signup and view all the answers

    Which chemical reaction does not correspond to the correct formation of a precipitate?

    <p>$FeSO4 + 2NaOH → Na2SO4 + Fe(OH)2$</p> Signup and view all the answers

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