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.
Noun. 1. mixture - (chemistry) a substance consisting of two or more substances mixed together (not in fixed proportions and not with chemical bonding). substance-the real physical matter of which a person or thing consists; DNA is the substance of our genes.. mixture - (chemistry) a substance consisting of two or more substances mixed together (not in fixed proportions and not with chemical bonding). substance-the real physical matter of which a person or thing consists; DNA is the substance of our genes.