Final answer:
Lad B.3 in redox titration lab answers is used to evaluate the chlorination of public water supplies by determining the total chlorine residual through the oxidation of I¯ to I3 and back titrating with S₂O3²-.
Step-by-step explanation:
In the context of redox titration lab answers, Lad B.3 is being used to evaluate the chlorination of public water supplies. It is a method for determining the total chlorine residual by using the oxidizing power of chlorine to oxidize I¯ to I3. The amount of I3¯ is then determined by back titrating with S₂O3²-.