how does sodium hydroxide solution help in distinguishing ferrous chloride solution from ferric chloride solution ?
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Hey Friend,
Sodium Hydroxide is a strong alkali which dissociates completely to furnish OH- ions.
The qualitative analysis of FeCl2 (ferrous chloride) or Iron(II) chloride and FeCl3 (ferric chloride) or Iron(III) chloride is as given below -
1. FeCl2
cation present - Fe++
FeCl2 + 2NaOH ---> 2NaCl + Fe(OH)2
FeCl2 is of white color... the precipitate formed Fe(OH)2 is dirty green in color and is insoluble in excess NaOH.
2. FeCl3
cation present - Fe+++
FeCl3 + 3NaOH ---> 3NaCl + Fe(OH)3
FeCl3 is of brown color... the precipitate formed Fe(OH)3 is Reddish brown in color and insoluble in excess NaOH.
Hope it helps!
Sodium Hydroxide is a strong alkali which dissociates completely to furnish OH- ions.
The qualitative analysis of FeCl2 (ferrous chloride) or Iron(II) chloride and FeCl3 (ferric chloride) or Iron(III) chloride is as given below -
1. FeCl2
cation present - Fe++
FeCl2 + 2NaOH ---> 2NaCl + Fe(OH)2
FeCl2 is of white color... the precipitate formed Fe(OH)2 is dirty green in color and is insoluble in excess NaOH.
2. FeCl3
cation present - Fe+++
FeCl3 + 3NaOH ---> 3NaCl + Fe(OH)3
FeCl3 is of brown color... the precipitate formed Fe(OH)3 is Reddish brown in color and insoluble in excess NaOH.
Hope it helps!
saighosal:
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thank you!
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