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a) Experimental procedure, part A. whats is the procedure for preparing 250 mL of 0.0210 M Na2S2O3 for this experiment from a 100 mL volume of standard 0.106 M Na2S2O3?

b) For the preparation of the 0.0210 M solution in a 250-mL volumetric flask. only a 25.0-mL calibrated volumetric pipet is available. explain how you would prepare the 0.0210 M Na2S2O3 solution using the 25.0-mL pipet. what would be its exact molar concentration?

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