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Consider the reaction of sodium hypochlorite with iodine. Which species is oxidised and which is reduced? (Give the oxidation numbers of the atoms to illustrate your answer.) (3) Describe the colour changes that take place during this experiment. What is the colour at the end point? (4) Why is hydrochloric acid added to the dilute bleach and iodine in the conical flask? (5) Explain why hydrochloric acid can be added using a measuring cylinder and not necessarily a pipette. (6) What is the role of starch in this titration? Why is it added near the end point of the titration, and not at the beginning?
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