29 августа, 2015 
Pokraskin It is imperative for the technical chemist to keep an accurate record of all his experiments, and the student should become accustomed to recording all of the work he performs in his laboratory notebook. He should not write up the directions he followed, but should describe the procedure he actually used in sufficient detail so that he later can repeat the experiment exactly on the basis of his notes, without introducing any new conditions. It is necessary, therefore, to make an accurate record of quantities used, the temperature maintained, and the reaction time, as well as the nature and size of the apparatus. The notes should also include observations made during the course of the reaction, such as the appearance or disappearance of a color or of a precipitate, libera — ation of gas, spontaneous increase in temperature, etc. It should also be noted how the rate of the reaction was controlled, how its completion was determined, how the purity of the product was established, etc.
When a project has been completed, a report should be written, summarizing the results obtained and describing the most successful methods found. The description should be complete enough so that any chemist could use it as a basis for repeating the experiment exactly.
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