For multivalent ions, it is usual to consider the conductivity divided by the equivalent ion concentration in terms of equivalents per litre, where 1 equivalent is the quantity of ions which have the same amount of electric charge as 1 mol of a monovalent ion : 1 / 2 mol Ca 2 +, 1 / 2 mol SO 4 2, 1 / 3 mol Al 3 +, 1 / 4 mol Fe ( CN ) 6 4, etc . This quotient can be called the " equivalent conductivity ", although IUPAC has recommended that use of this term be discontinued and the term molar conductivity be used for the values of conductivity divided by equivalent concentration.
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