Determination of the (w/v)% Sodium Hypochlorite in Household Bleach

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Last updated 7:38 PM on 4/21/26
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4 Terms

1
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Which reactant goes in the burette and the conical flask and why?

  • the standard thiosulfate goes in the burette

  • the dilute bleach goes in the conical flask

the base goes in the flask as it can react with the glass over time causing blockages

2
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What is added to the bleach solution and why?

  • dilute sulfuric acid

  • supplies sufficient H+ ions so that all the hypochlorite ions are completely reduced to Cl- ions and iodine

3
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What is added to keep iodine in solution in the titration + what is the other reason for adding it?

iodide ions/potassium iodide

to ensure all the bleach has reacted to produce the maximum amount of iodine

4
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Describe the colour change during the titration

red-brown to straw yellow

blue-black to colourless