Determination Of The Percentage Of Hypochlorite In Bleach

Question 1

What colour developed when the potassium iodide and the sulfuric acid reacted with the diluted bleach in the conical flask?

Answer 1

Brown

Question 2

Give two reasons why excess potassium iodide was used.

Answer 2

So that all the bleach has reacted and to keep the iodine in the solution

Question 3

Why is the conical flask on a white tile?

Answer 3

So that the colour change was much easier to see.

Question 4

What’s the indicator?

Answer 4

Starch

Question 5

Colour change?

Answer 5

Blue-black->colourless