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 - the real physical matter of which a person or thing consists; DNA is the substance of our genes. matter - that which has mass and occupies space; physicists study both the nature of matter and the forces which govern it. body substance - the substance of the body.