Bottle of solution of sodium dodecyl sulfate for use in the laboratory. The critical micelle concentration (CMC) in pure water at 25 Â°C is 8.2 mM, and the aggregation number at this concentration is usually considered to be about 62. The micelle ionization fraction (Î±) is around 0.3 (or 30%).
Definition: A pure substance is a sample of matter with both definite and constant composition with distinct chemical properties.
substance-a particular kind or species of matter with uniform properties; shigella is one of the most toxic substances known to man. matter-that which has mass and occupies space; physicists study both the nature of matter and the forces which govern it.