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 (C)</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 (C)</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 (A)</p> Signup and view all the answers

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

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

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