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Twelfth Grade (Grade 12) Analytical Methods Questions

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Grade 12 Analytical Methods
Complete the following reaction, which summarizes the gravimetric estimation of iron:

[math]Fe^(3+) + 3OH^(-) rarr Fe(OH)_3(s)[/math]
[math]2Fe(OH)_3(s) rarr[/math]
  1. [math]Fe_2O_3(s) + 3H_2 O[/math]
  2. [math]Fe_3O_4 + 2H_2O[/math]
  3. [math]Fe_2O_3 + 2H_2O[/math]
  4. [math]Fe_3O_4 + 3H_2O[/math]
Grade 12 Analytical Methods
In gravimetric analysis, which of the following steps has to be carried out after the "drying" of the precipitate?
  1. Ignition and incineration
  2. Digestion
  3. Filtration
  4. Washing
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