Chapter 2 Chemical Apparatus, and Unit Operation of Analytical Chemistry Classifying Chemicals 1. Reagent Grade: Reagent grade chemical conform to the. - ppt download

Chapter 2 Chemical Apparatus, and Unit Operation of Analytical Chemistry Classifying Chemicals 1. Reagent Grade: Reagent grade chemical conform to the. - ppt download: Cleaning and Marking Laboratory Ware Every beaker, flask, or crucible that will contain the sample must be thoroughly cleaned before being used. The apparatus should be washed with a hot detergent solution and then rinsed, initially with tap water and finally with several small portions of deionized water. Organic solvents such as benzene or acetone may be used to remove grease films. A chemical analysis is ordinarily performed in duplicate or triplicate. Each vessel that holds a sample must be marked so that its content can be positively identified. Flask, beaker and some crucibles have small etched areas on which semi permanent mark can be made with a pencil.