solution
a completely perfect mixture of solute and solvent. Particles of a solute are evenly distributed
concentration
amount of solute dissolved in a given amount of solution
molarity
number of moles of solute per litre of solution
standard solution
solution whose concentration is accurately known
primary standard
substance that can be obtained in a stable pure and soluble solid form so it can be weighed out and dissolved in water to give a solution of accurately known concentration