lab 3 - 1 EXPERIMENT 3 STANDARDIZATION OF HCL AND ANALYSIS...

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1 EXPERIMENT 3 STANDARDIZATION OF HCL AND ANALYSIS OF SODA ASH 07F A. STANDARDIZATION OF ACID A carboy (~ 40 L) of approximately 0.1 N HCl is available in the laboratory. The solution must be standardized before use. Two determinations per student are sufficient to provide reasonable statistics and not consume all of the acid during the standardization. If your value is significantly different from the values in your section, you should repeat the standardization to check your technique. There are many procedures for the standardization of hydrochloric acid. The following procedure is based on the procedure in W. E. Harris and B. Kratochvil, An Introduction to Chemical Analysis , Saunders, 1981. Weigh approximately 0.2 g (+ 0.1 mg) of dried (previously dried at ~ 150 o C for 2 – 4 hours) primary standard Na 2 CO 3 into a clean 250 mL Erlenmeyer flask. This amount should be sufficient to require 35 – 40 mL (one almost full buret) for the titration. Dissolve the sample in 50 – 75 mL of boiled, cooled distilled water {ice bath: ice machine in basement; graduated cylinder OK}. Add 3 – 4 drops of bromcresol green indicator and titrate with the HCl solution. When the solution reaches an intermediate green color, stop
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lab 3 - 1 EXPERIMENT 3 STANDARDIZATION OF HCL AND ANALYSIS...

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