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.
Nature of a toxic substance. Definition of a poison. A poison is a substance capable of producing adverse effects on an individual under appropriate conditions. The term âsubstanceâ is almost always synonymous with âchemicalâ and includes drugs, vitamins, pesticides, pollutants, and proteins. Even radiation is a toxic substance.