All Questions
Tagged with inorganic-chemistry redox
393
questions
-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 ...
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0
votes
1
answer
53
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Determining an unknown E° from two similar half ox/redox reactions
Use the oxidation half-cell and reduction half-cell, $\ce{Cr^3+/Cr^2+} = \pu{0.424 V}$ and $\ce{Cr^3+/Cr2O7^2-} = \pu{1.32 V}$, to determine the $E^\circ$ for $\ce{Cr2O7^2-/Cr^2+}$:
a. $\pu{-1.75 V}$
...
0
votes
1
answer
123
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What reaction takes place when ammonia and sulfur dioxide are introduced into barium chloride solution?
What reaction takes place when gaseous $\ce{NH3}$ and $\ce{SO2}$ are introduced into $\ce{BaCl2}$ solution and an insoluble white solid is produced?
I think that the white solid could be $\ce{BaSO4}$ ...
- 133
-2
votes
1
answer
62
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Hydrogen oxidation number
I am aware that since 2005, IUPAC guidelines established that hydrogen is more electronegative than all elements from group V in the periodic table (you can check official documentation). Thus, $\ce{...
6
votes
0
answers
452
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How to explain oxidizing power from Molecular Orbital Theory
I am trying to explain the oxidizing property of $\ce{Fe^3+}$ in $\ce{H2O}$ and $\ce{CN^-}$ which is $\ce{[Fe(H2O)6]^3+}$ and $\ce{[Fe(CN)6]^3-}$.
The electrochemical reactions along with their ...
- 620
2
votes
0
answers
66
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Copper reaction with nitric acid
According to this paper, the green colour from the reaction of copper and nitric acid could be explained:
The color is greenish, probably as a result of a combination of the
pale-blue color of the ...
user139387
-3
votes
2
answers
111
views
Is it possible to make thermite that detonates? [closed]
Why does thermite burn pretty slowly? Can it burn much faster if the components were ground to much smaller grain sizes? Can it be made to actually detonate--that is, the entire pile turning into ...
- 103
-1
votes
1
answer
76
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Effects on pressure on reverse electrolysis
I am interested in the effects on pressure of the following reaction.
$$\ce{O2 + 4H+ + 4e- → 2H2O}$$
I have been trying to find data on this for a while, and I am sure that the information exists, but ...
- 11
0
votes
1
answer
168
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Is it not possible to balance the equation $\ce{I2 +O3 -> I4O9 +O2}$ in many ways? [closed]
The above reaction can be balanced in many ways. For example, the coefficient of $\ce{I2}$ is two when coefficient of $\ce{I4O9}$ is one. But the coefficient of $\ce{O3}$ and $\ce{O2}$ can be 5 and 3 ...
- 99
3
votes
1
answer
179
views
Role of MnSO4 in permanganometric titration
This might sound like a stupid question, but I have been unable to wrap my head around it.
Recently in a lab I had to titrate H2C2O4 with KMnO4 in acidic medium (H2SO4). However, in the work, it ...
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 ...
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-3
votes
1
answer
109
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Which of the following might turn NaNO2 into N2? [closed]
Which of the following might turn $\ce{NaNO2}$ into $\ce{N2}$?
A. $\ce{NaCl}$ B. $\ce{NH4Cl}$ C. $\ce{HNO3}$ D. $\ce{H2SO4}$
The answer is B and we have
$$\ce{NH4Cl + NaNO2 = NaCl + 2H2O + N2↑}.\tag1$...
- 133
-2
votes
1
answer
48
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Where does the ionisation energy for a reaction to take place comes from? [closed]
Can anyone tell me exactly what happens during a chemical reaction in terms of ionisation energy? I know that during a reaction there is an exchange of electrons (except for those where electrons are ...
0
votes
1
answer
77
views
Why does hypophosphorous acid oxidation occur in acidic media?
When one mole of $\ce{H3PO2}$ is treated with excess $\ce{I2}$ in acidic solution, one mole of $\ce{I2}$ is reduced; on making the solution alkaline, a second mole of $\ce{I2}$ is consumed.
I am ...
- 9
0
votes
0
answers
100
views
In which medium is Potassium Permanganate a better oxidising agent?
I was in chemistry class just now, and my chemistry teacher gave us three reactions:
Reaction 1: $\ce{MnO4^- + e- -> + MnO4^2- (basic medium)}$
Reaction 2: $\ce{MnO4^- + 4H+ + 3e- -> + MnO2 + ...
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