Equivalent weight = molar mass ÷ n-factor
For acids: equivalent weight = molecular weight ÷ number of replaceable H+ ions
For bases: equivalent weight = molecular weight ÷ number of OH− ions
For salts: equivalent weight = molecular weight ÷ total positive or negative charge involved in reaction
For redox substances: equivalent weight = molecular weight ÷ number of electrons transferred per molecule
For acids in a specific reaction: equivalent weight = molecular weight ÷ basicity
For bases in a specific reaction: equivalent weight = molecular weight ÷ acidity
For oxidizing agents: equivalent weight = molecular weight ÷ electrons gained
For reducing agents: equivalent weight = molecular weight ÷ electrons lost
Determine the reaction involved
Find the n-factor for that reaction
Divide the molar mass by the n-factor