Colour Changes

Question 1

Iodine ions to Iodine molecules

Answer 1

starch yellow/brown goes blue/black

Question 1

Iodine molecules to Iodine ions

Answer 1

starch is colourless

Question 2

Permanganate ions

Answer 2

-when permanganate ions are present the solution will be purple
-as soon as the permanganate ions are used up it will turn colourless

Question 3

Cobalt Ions

Answer 3

when cobalt ions are used the reaction is first pink then the reaction takes place and it turn green and goes back to green since catalyst regenerates

Question 4

zinc

Answer 4

when zinc turns into an ion it goes brown

Question 5

copper ions to copper molecule

Answer 5

when copper ions turn into molecule it loses its blue colour

Question 6

Iodide ions to iodine molecules by hydrogen peroxide

Answer 6

brown colour can be seen as iodide ions are converted to iodine molecules by hydrogen peroxide

Question 7

Potassium Permanganate

Answer 7

potassium permanganate is used in redox titrations as its self indicating, purple permanganate ions are reduced to colourless mangane ions.

Question 8

Dichromate

Answer 8

dichromate is used as a reagent in the oxidation of alcohols and aldehydes, changes from orange dichromate to blue/green chromate ions.