All Questions
Tagged with experimental-chemistry redox
74
questions
3
votes
1
answer
72
views
How to quantify the concentration of sodium nitrate leftover from eutrophication through titration?
In my experiment, I am trying to quantify the nitrate absorption by duckweed. I need a titration method to measure the left over nitrate levels in the solution. However, this is to be done in a school ...
-3
votes
1
answer
69
views
Standardizing alkaline ferricyanide solution [closed]
The ferricyanide method of determining reducing sugars is simple but I need clarity on time of addition of potassium iodide solution. I am unable to observe change in color from yellow to blue. I even ...
- 1
1
vote
2
answers
60
views
Oxidation of Isopropanol by Permanganate in Basic Solution
so I've been designing an experiment where I will explore the effect of isopropanol concentration on the colour change of a solution containing permanganate, isopropanol, and NaOH.
I know that the ...
- 13
2
votes
0
answers
58
views
How can I refine my method of determining iron content in spinach?
I have begun a chemistry experiment that attempts to determine how iron content in spinach is affected by the length of time it is cooked. Through research, I learned that iron content is often ...
- 21
5
votes
2
answers
371
views
Using potassium dichromate and sulfuric acid to clean test tubes after Tollens’ test
We had an experiment at school to find out the biomolecules contained in the different foodstuffs. After doing Tollens’ test which turned out to be positive, our teacher instructed us to clean the ...
- 828
1
vote
0
answers
504
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Why does copper(II) sulfate or iron(III) nitrate work as a catalyst for the iodate variant of the Iodine Clock?
In the iodine clock reaction (iodate variation), the reaction of iodate and bisulfite ions apparently is the rate-determining step. I was wondering if $\ce{Cu^2+}$ and $\ce{Fe^3+}$ will act as ...
- 37
2
votes
1
answer
117
views
Reduction of La(NO3)3 to La(NO2)3
I'm writing a master's thesis on some lanthanide compounds, in particular those with $\ce{Ce^{+3}}$ and $\ce{La^{+3}}$, although my focus has now shifted to lanthanum, but I ran into a problem when I ...
- 142
-3
votes
1
answer
194
views
Why does increasing the surface area of the cathode submerged in the electrolyte increase the current in a galvanic cell? [duplicate]
I can understand why increasing the surface area of the anode would increase the current, because the rate of oxidation will be increased resulting in a greater rate of flow of electrons through the ...
- 5
1
vote
0
answers
151
views
Resazurin not turning pink
I want to add resazurin to my media as an anaerobic indicator.
To my understanding, the resazurin is blue when first added to the media, then turns pink after autoclaving, and finally it turns ...
2
votes
0
answers
37
views
Glycation of peptides (Maillard reaction) by reductive amination
I would like to link glucose to the primary amines in a peptide containing lysine. Can I just mix glucose and the peptide and add some cyanoborohydride to perform a reductive amination? As long as my ...
- 137
5
votes
0
answers
81
views
Oxygen tolerant RAFT polymerization using AIBN?
I want to do some RAFT polymerizations but don't have a nitrogen line at the moment. It seems that people have recently implemented oxygen scavenging strategies to enable open-air RAFT polymerization. ...
- 137
3
votes
0
answers
149
views
Why the change of the position of the salt bridge or metal piece leads to different voltage value?
I am doing an experiment where I use salt bridge to create galvanic cell. The goal of my experiment is to find if there is some correlation between the amount of solvent being used and the voltage ...
- 139
-1
votes
1
answer
143
views
battery using zinc, copper, and vinegar
I filed one side of a penny to reveal the zinc; then I bent the coin and dropped it into a cup of white vinegar. Shortly afterward, many tiny bubbles were forming on the zinc side. Later on, I noticed ...
7
votes
2
answers
1k
views
Mechanism of the blue bottle experiment
I have researched multiple mechanisms for this experiment yet all of them suggest different versions or are too vague. None of them are consistent since the final overall equation seems to be missing ...
- 73
4
votes
1
answer
191
views
Would this redox titration be possible as a direct titration rather than a pseudo-back titration?
In a general chemistry lab protocol (green chemistry, ISBN-13: 978-1482230208), students determine the content of ascorbic acid in a vitamin C tablet. There is an ascorbic acid standard in a buret, ...
- 41.2k