Equivalence factor or n factor (Equivalent weight)

  • Thread starter erisedk
  • Start date
  • #1
374
7

Homework Statement


Equivalence factor of the salt is FeSO4.Cr2(SO4)3.24H2O is
Ans is 8.

Homework Equations




The Attempt at a Solution


Equivalence factor of an acid or base is its basicity or acidity, and for a compound undergoing redox reaction, it is the number of electrons exchanged per mole of compound. I'm not sure how to go about in the case of the given salt.
 

Answers and Replies

  • #2
Borek
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Rather lousy question if you ask me. You can get 8 trying to precipitate hydroxides of both metals, but if you go for redox the more reasonable number is 7 (two Cr(III) get oxidized to Cr(VI) giving away 6 electrons, and Fe(II) gets oxidized to Fe(III) giving one electron, 6+1=7).

In general, equivalents are often confusing when there is more than one reaction that can take place (which is why they should be avoided in the initial chemistry lessons).
 
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Likes epenguin
  • #3
374
7
Ok thanks!
 

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