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The n factor can be calculated by-
1) In acids- The number of ionisable hydrogen (
![straight H to the power of plus](https://search-static.byjusweb.com/question-images/byjus/_c6751346-cd93-4ac5-835a-4c2e3fe6034620180807-28344-1ogsbww.svg)
) atoms are equal to n factor.(Hydrogen that can be Inoised when in aqueous medium)
2) In bases- The number of ionisable hydroxyl ions (
![OH to the power of minus right parenthesis](https://search-static.byjusweb.com/question-images/byjus/_dc80cd4b-fa29-4cff-9830-c3ec2590b54320180807-28344-1lxw87x.svg)
are equal to n factor.
3) In complex compounds- check for total charge on metal.
4) In reactions- The number of electrons involve
For compound SO2. We generally observed that when SO3 changes to SO2
there is change in oxidation state from +6 to +4. It involves 2 electrons. Hence n factor is 2.
In NaHCO3, there is only one ionisable hydrogen so n is 1