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<p>equation will lead to a correct expression for charge.</p>

<p>The number density of <a href="page.php?w=solute">solute</a> molecules in a <a href="page.php?w=solvent">solvent</a> is sometimes called <a href="page.php?w=concentration">concentration</a>, although usually concentration is expressed as a number of <a href="page.php?w=Mole_%28unit%29">moles</a> per unit volume (and thus called <a href="page.php?w=molar_concentration">molar concentration</a>).</p>

<p><big>Relation to other quantities</big></p>
<p><big>Molar concentration</big></p>
<p>For any substance,</p><p>
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