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Initial concentration refers to the molarity or amount of substance per unit volume present at the start of a reaction before any change has occurred.
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Molarity: A measure of the concentration of a solute in a solution, or of any chemical species, in terms of amount-of-substance concentration.
Solute: The minor component in a solution that is dissolved by the solvent.
Solvent: A substance that dissolves a solute resulting in a solution; usually it's the component present in greater quantity.