# how to calculate n-factor of a compound?

Ashwin Sinha
520 Points
10 years ago

Dear Avratanu ,

See
There are 4 types in that
Type 1
For acids if the only the acid is given then you have to check the replaceable  hydrogen atom it contains
If a reaction is given then you have to check the replaced hydorgen atom

Type 2
For bases if the only the acid is given then you have to check the replaceable  hydroxyl ion it contains
If a reaction is given then you have to check the replaced hydroxyl ion

Type 3
For salts you have check the total positive charge on the salt
For e.g  FeSo4.(NH4)2SO4.6H2O
See this you donot have to consider the water And the total positive charge is Fe +2 + NH4 +1*2  = +4 Therefore the n factor is 4

Type 4
For Redox Equation You have to consider the change in oxidation number and multiple with the no. of atoms of the element present in the compound.

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Prashant Singh Thakur
11 Points
4 years ago
We need to find V. F. to calculate equivalent wt. and solve problems using concept of equivalence. Valence factor is a broader term and is defined in different forms for different types of chemical changes.Memorizing these list of formulae and solving few questions will definitely make you master this topic. Valence factor = 1)no. of moles of H+ displaced from one mole of acid during any chemical reaction2)no. Of moles of OH- displaced from one mole of base3)for neutral salts total no.of charges displaced during any chem. reaction. 4)LCM of charges present over neutral salt ions 5)in redox reactions make oxidation half and reduction half and then find no. Of electon exchanged per mole of required specie. 6)in general type equations where you just can`t identify anything useV. F=|TOTAL CHANGE IN OXIDATION STATE|*no. Of that atom present in 1 moleculeBut before using these develop a general concept of, Neutralization reactions, disproportionation reaction, redox reaction, peroxide linkage and methods to find oxidation state of atoms in a molecule.