最小
发表于 2025-3-25 06:06:46
Fundamental Apparatus and Operationsf the reactions performed, the skill and care applied to the experimental work are the most important factors in obtaining the correct end product with satisfactory purity and thus successful analysis.
BARB
发表于 2025-3-25 10:46:20
Compounds of Order IIlume. The order, however, is divided into three genera. The division is based upon the results of titrations which place the substance into one of the following: Genus 1, acidic species; Genus 2, basic species; and Genus 3, neutral species. The titrations and divisions are summarized in Table 19.
restrain
发表于 2025-3-25 11:39:10
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Corroborate
发表于 2025-3-25 17:54:01
Preparation of the Sample recrystallization, distillation, etc., usually suffices to free it of impurities. In the case of (.), however, all of the components are regarded as . and are to be separated, purified, and identified and both chemical and physical methods of separation can and should be employed.
披肩
发表于 2025-3-25 23:28:08
f such data in terms of the qualitative and quantitative composition of the test substance. As in the old tale of the blind men and the elephant, a single observation or test, not considered in conjunction with others, may lead to entirely erroneous conclusions. On the other hand, mere in crease in
Overthrow
发表于 2025-3-26 03:48:33
Introductionworking. These may be the reactants, the products, or the by-products. In some cases the problem is one of ., that is, the identification of substances previously isolated or prepared and described in the literature. At other times the problem is one of . or the determination of the constitution and
就职
发表于 2025-3-26 07:08:20
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DEBT
发表于 2025-3-26 11:03:33
Preparation of the Sampleus series, for example, could not be separated from each other for the purpose of identification by purely chemical reactions. Nevertheless, final identification of a substance is made, as pointed out before, by measurement of the physical constants of what is assumed to be a single, pure compound.
口味
发表于 2025-3-26 12:43:07
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英寸
发表于 2025-3-26 19:56:44
Solubilityin the classification of a substance, in the determination of the existence of, or distinction between polymorphs, in the selection of the proper solvent for the recrystallization of a compound, and for identification by the crystallization of a definite form.