Unit 2 Oxidising agents Flashcards
What is colour change with acidified dichromate?
Orange to green
What is colour change with hot copper oxide?
Black to red/brown
What is colour change with Fehlings solution?
Blue to brick red
What is colour change with Benedict’s solution?
Blue to brick red
What is colour change with Tollen’s reagent?
Silver mirror forms
What is colour change with acidified permanganate?
Purple to colouless
Why do permaganate and dichromate solutions have to be acidified?
To provide a source of H+ (aq) ions
Why is acidified permanaganate a useful indicator?
It is self-indicating and gives a clear end point due to clear colour change
Show (by using ion-electron eq) that Fehlings and Benedicts are behaving as Oxidising Agents
Gain of electrons is reduction.
Oxidising agents are reduced
Show (by using ion-electron eq) that Acidified Dichromate is behaving as an Oxidising Agent
Gain of electrons is reduction.
Oxidising agents are reduced
Show (by using ion-electron eq) that Tollen’s Reagent is behaving as an Oxidising Agent
Gain of electrons is reduction.
Oxidising agents are reduced
Show (by using ion-electron eq) that hot Copper Oxide is behaving as an Oxidising Agent
Gain of electrons is reduction.
Oxidising agents are reduced
