All Questions
Tagged with equilibrium redox
33
questions
10
votes
2
answers
4k
views
Why is chromate stable in basic medium and dichromate stable in acidic medium?
When I was studying the equilibrium existing between chromate and dichromate ions in the solution, I came to know that
Chromate ion is more stable in basic medium while dichromate ion is stable in ...
- 797
1
vote
0
answers
91
views
Equilibrium cell potential question
In an attempt to wrap my head around the basics of electrochemistry I'm working my way through Wesley R. Browne's 'Electrochemistry' primer.
With regards to the equilibrium potential of an ...
- 31
2
votes
3
answers
2k
views
Why is the voltage produced by a voltaic cell affected by temperature as described by the Nernst Equation?
I understand why changing the concentrations of the electrolytes in a voltaic cell affects the voltage. Given a zinc-copper cell for example, if I were to increase the concentration of the zinc ...
- 71
3
votes
1
answer
317
views
How can batteries reach equilibrium if the reactions are irreversible?
My book says that the batteries we have considered so far (Daniell cells) have a low life span because they reach equilibrium too quickly.
In the next paragraph, it states they are also made by ...
- 77
1
vote
1
answer
98
views
What would be the concentration of products in this calcium producing system?
I wanted to figure out a way to make calcium metal with potassium oxide. $\ce{K2O}$ undergoes disproportionation at $\pu{350-430 °C}:$
$$\ce{2 K2O -> K2O2 + 2 K}$$
Now, if I mixed in $\ce{CaO}$ (...
- 1,480
1
vote
1
answer
3k
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Can an iodine clock reaction work without using a strong acid?
I'm going to do an iodine clock reaction for a project and we had to submit the materials and safety sheets for the experiment a while ago. I thought I could do one by using hydrogen peroxide, sodium ...
- 11
1
vote
0
answers
980
views
Manganese (II) oxidation by air
I am studying the reaction of dissolved dioxygen with manganese(II) hydroxide for the Winkler method:
2Mn(OH)2(s)+O2(aq)⟶2MnO2(s)+2H2O(l)
The ...
- 11
3
votes
1
answer
189
views
Are my intuitions about how batteries work right? [closed]
Being really fascinated by how electricity actually works, I started studying batteries.
I initilally understimated the complexity of this apparently-simple objects, and thorugh studies and researches ...
1
vote
2
answers
987
views
Calculate the cathode electrode potential in this redox reaction
In this problem I'm asked to calculate the electrode potential of the magnesium electrode ($E_{Mg^{2+}/Mg}$) given the red-ox reaction:$$\text{Mg(s)}+2\text{Ag}^+(10^{-2}\text{M})\leftrightarrow 2\...
-1
votes
1
answer
108
views
Redox - concentration cell
I'm studying galvanic cells and I've found a demonstration that lead me to an impossible result, so there must be a mistake, but I can't find what it is.
My problem is about concentration cells made ...
- 197
1
vote
2
answers
2k
views
Single electrode potential measurement
My textbook says that in a galvanic cell, it's not possible to measure single electrode potential independently. Instead, a Standard Hydrogen Electrode is used as the system is under equilibrium. Can ...
- 59
6
votes
2
answers
1k
views
Balancing complex haloform redox reaction
I just completed a haloform reaction experiment, using acetophenone and sodium hypochlorite to form benzoic acid and chloroform.
My lab report has a question regarding balancing the equation of the ...
- 61
23
votes
2
answers
5k
views
Why don't everyday things burn?
Ok, so I learned about the equilibrium constant. Now, I've seen that the equilibrium constant of burning is extremely small $(K \ll 1)$. here, I have a question. you see, $K$ is still NOT 0, which ...
- 411
2
votes
1
answer
4k
views
Does a Na2SO3 solution oxidize to Na2SO4 in an oxygen rich atmosphere?
Let's assume I have a pure solution of water and $\ce{NaOH}$. When this solution comes in contact with an atmoshpere containing inert gases and $\ce{SO2}$, then $\ce{NaHSO3}$ and $\ce{Na2SO3}$ will be ...
- 21
0
votes
1
answer
262
views
How to calculate the concentration of lead(II) liberated from lead(IV) oxide under acidic conditions? [closed]
What is the concentration of $\ce{Pb^2+}$ in a lake that has a pH of $6.0$ and is in equilibrium with $\ce{PbO2(s)}$ and atmospheric oxygen?
\begin{align}
\ce{PbO2(s) + 4H+ + 2e- &-> Pb^2+ + ...
- 17