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.
Best Answer: It would depend on your definition of a chemical. A chemical is: a substance produced by or used in a chemical process.. And, water is a chemical because it is be used in chemical reactions such as neutralization, redox, etc. I believe what you're asking though is if water is a chemical substance: a material with a definite chemical composition.. Water is also a chemical composition because of its electron configuration in its valence shell which defines its chemical properties. Source(s): Definition of Chemical: http://dictionary.reference.com/browse/c... Definition of Chemical Substance: http://en.wikipedia.org/wiki/Chemical.