ABSTRACT
Chemicals are manufactured in varying degrees of purity. One of the most important aspects of analysis is the quality of the laboratory pure water to be used for preparation of standard solutions, reagents, dilutions, and blanks. Distillation is the procedure in which the liquid is vaporized, recondensed, and collected. Distilled water quality depends on the type of still and the quality of the feedwater. Reagent-grade water is the highest purity that is available; it is even purer as triple distilled water. Solution is a homogeneous mixture of two or more substances, consisting of ions or molecules. Prepared solutions and reagents should be properly labeled. The label should contain the name and concentration of the solution, date of preparation or date received, date container was opened, and the initials of the scientist who prepared the solution or opened the container. Special storage recommendations and preparation frequency are also important parts of a reagent bottle label.
