Standard solution: The standard solution is the solution whose concentration is known and does not change on standing
A known weight of the solute/ substance dissolved in a known volume of solution.
Moles: The number of grams of a substance that reacts with 1 mole of H+ ions (acid or base) or 1-mole electrons (redox system) or 1 mole of univalent cation ( complex formation and precipitation reaction).
Equivalent weight: The weight in gram containing one equivalent of a substance.
Normality: The number of grlitreles equivalent dissolved per litre of the solution.
Morality: The number of gram moles of the solute dissolved per kilogram of solvent.
Formality: The number gram formula weight of solute dissolved per litre of solution.