Electrochemistry: Oxidation Reactions
Not what you're looking for?
Please explain how to do these E-chem reactions.
Set 1:
Find the standard reduction potential for the reaction (it's a range based off results)
VO3-(aq) + 4H+(aq) + e- → VO2+(aq) + 2H2O(l) Ecell=??
Results for my reactions any heat that is mentioned was for 12-15 minutes
Vanadyl Sulfate (blue solution):
1.) 20 drops of 3% H2O2: initially turned brown and then pale green after heat
2.) 40 drops of Bromine water: initially green then light blue/green after heat
3.) 20 drops of 0.2M NaNO3: initially blue and after heat blue
4.) 20 drops of Fe2(SO4)3: initially blue and after heat green
5.) 20 drops of 0.2M Na2SO4: initially blue then after heat still blue
6.) control tube
Ammonium Vanadate (yellow solution):
1.) pea size amount of amount solid Na2SO3: turned cloudy blue then clear blue
2.) 20 drops of distilled water: no reaction and no heat
3.) 20 drops of 0.2M NaBr: no reaction and no change after heat
4.) 20 drops of 0.2M NaNO2: turned pale green/blue and light blue after heat
5.) pea size amount of Fe(NH4)2(SO4)2 *6H2O: turned turquoise immediately
6.) 20 drops of H2C2O4: no reaction initially but turned blue after heat
7.) control tube
I have to find the range of the above reaction based on the results we obtained, my lab book does not explain how to go about finding this range and I am at a loss at how to do it.
Purchase this Solution
Solution Summary
This solution explains how to solve problems related to oxidation reactions and electrochemistry.
Solution Preview
The goal is to determine whether or not a reaction occurred based on your observations. For a reaction to occur, the final voltage has to be >0. Take the first reaction for example. Peroxide changing to water provides a potential of 1.77 V and takes 2 e-. The half-reaction to balance this would be:
VO(+2) + H2O --> VO2(+1) + 2H+ + e-
because it gives off ...
Purchase this Solution
Free BrainMass Quizzes
Thermochemistry
The quiz helps in revising basic concepts about thermochemistry.
Match Elements with their Symbols
Elements are provided: choose the matching one- or two-letter symbol for each element.
General Chemistry - Classification of Matter
This test will assess your knowledge on the classification of matter which includes elements, compounds and mixtures.
Functional groups in Organic Chemistry
You will be tested on the names of functional groups in Organic Chemistry. It is very important to know the functional groups to understand Organic reactions.