Question

how to calculate n factor in disproportion reaction

Answer 1

Hello FRIEND HERE IS YOUR ANSWER.
For bases, n-factor is defined as the number of OH– ions replaced by 1 mole of base in a reaction. Note that n-factor is not equal to its acidity i.e. the number of moles of replaceable OH– ions present in 1 mole of base. For example, n-factor of NaOH = 1.
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Answer 2

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H3BO3 n factor = 1. Thus, one mole of H3BO3 in the solution gives just one mole of H+, so its n factor is one. Bases: Bases are the species that provides OH− ions when dissolved during a solvent. For bases, the number of OH− ions replaced by one mole of base during a reaction is called n factor.