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# How many equivalents are in $0.40$ mole of ${K^ + }$?

Last updated date: 17th Jun 2024
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Hint: Equivalents is a term related to the valency of the atom in ionic form. It calculates the number of ions required to neutralize the ion with opposite charge.

$number{\text{ }}of{\text{ }}equivalents = moles \times valency$
In this case the given ion is potassium ion which is a monovalent ion. The monovalent ions are the ones which require the unit oppositely charged ions to neutralize the charge and become neutral. As the potassium ion carries a $+ 1$ charge so it requires a unit $- 1$ charge to neutralize.
Each mole of potassium cations produces one mole equivalents of the ion in solution. The valency of the potassium ion is given as $+ 1$ and the mole of potassium ion given is $0.40$ mole.
$= moles{\text{ }}of{\text{ }}{K^ + } \times valency{\text{ }}of{\text{ }}{K^ + }$
$= 0.4mole \times 1Eq/mole$
$= 0.4Eq.$