Experiment 4 Practice of Gravimetric Analysis Using Physical Separation Methods

Experiment 4 Practice of Gravimetric Analysis Using Physical Separation Methods 

A number of experiments in this text require that a sample be dried before proceeding with the chosen method. Examples in this chapter include an unknown sulfate (see Experiment 6, step 1) and an unknown iron (see Experiment 7, step 1). An example in Chapter 4 is the KHP standard in Experiment 8 (see Experiment 8, step 1). In this experiment, the percent loss on drying of one of these materials will be determined. 

Reference General Test 731 , U.S. Pharmacopeia-National Formulary, USP 24—NF 19,2000, p. 1954. Remember safety glasses. 

Add the sample to be dried to the weighing bottle. Record the exact weight, weighing bottle plus sample. 

Place the weighing bottle with the sample, lid ajar, back in the drying oven and dry for the time specified in Experiment 6, 7, or 8. 

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