analytical chemistry problem?

H

HisashiH

New member
a 3.026 g portion of Copper(II) salt was dissolved in a 250ml volumetric flask a 50ml aliquot was analyzed by adding 1gram of KI and titrating the liberated iodine with 23.33ml of 0.04668 M Na2S203 find the weight percent of Cu in the salt, should starch indicator be added to this titration at the beginning or just before the end point
 
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