Answer to Question #93861 in General Chemistry for Kylie

Question

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?

Answer 1

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