Chapter 7.2 textbook : Oxidation and Reduction by Justin Gunawan 3W

Definitions: Basically oxidation means adding or gaining oxygen and reduction means losing oxygen. You can also say Oxidation means the loss of hydrogen while reduction means gaining it. Oxidation is also a loss of electrons and reduction is gaining it. Oxidation and reduction always takes place together and that means if one substance is oxidised the other one is reduced.

Redox Reaction: Redox reaction is actually means any reaction which involved electrons transfers.












The Expertiment : The Oxidation of Alchohols.

Apparatus and chemicals :

Eye protection

Measuring cylinder (5 or 10 cm³)
Well-plate (24 wells) – eg Sigma ref: M9655.
Glass rod
Plastic dropping pipettes, 6

The Oxidation of alchohol.

a Take approximately 2 cm³ of potassium dichromate(VI) solution in a measuring cylinder and add about 1 cm³ of dilute sulfuric acid. Stir with a glass rod.

b Put 10 drops of the acidified potassium dichromate(VI) solution into each of the wells
A1 – A4 and B2 (see diagram below).

c Practice (over a sink) producing single drops of ethanol from the pipette.

d Add two drops of the alcohols to the wells as follows:

Well No.	Alcohol
A1	Ethanol
A2	Propan-1-ol
A3	Propan-2-ol
A4	2-Methylpropan-2-ol

The following alcohols in dropping pipettes:

Ethanol (Highly flammable) or Industrial denatured alcohol, IDA (Highly flammable, Harmful)
Propan-1-ol (Irritant, Highly flammable)
Propan-2-ol (Irritant, Highly flammable)
2-Methylpropan-2-ol (Harmful, Highly flammable), or other tertiary alcohol

Potassium dichromate(VI) solution, 0.1 mol dm^–3 (Toxic at this concentration), 2 cm³
Sulfuric acid, 1 mol dm^–3 (Irritant at this concentration), 1 cm³

Reference: http://www.practicalchemistry.org/experiments/intermediate/oxidation-and-reduction/the-oxidation-of-alcohols,217,EX.html