All Questions
Tagged with equilibrium electrochemistry
47
questions
2
votes
2
answers
906
views
For Hess' law type questions, when do you take the inverse of the constant and when do you switch the sign?
For example, when you're given the enthalpy $\Delta H$ of a reaction and you want to switch that reaction around in order to add it to something else, you switch the sign. Furthermore, when adding ...
- 121
3
votes
1
answer
1k
views
Is a discharged battery in a state of chemical equilibrium?
A reaction that has reached chemical equilibrium no longer shows changes in reactant and product concentrations, but forward and reverse reactions are still going on. I'm confused whether a completely ...
- 41.2k
2
votes
1
answer
2k
views
Determining the reduction potential of a half cell reaction at a given pH
$E^\circ_\ce{Cu^2+|Cu} = \pu{0.34 V}$.
What will be reduction potential at $\mathrm{pH} = 14$ for the same couple?
Given that $K_\mathrm{sp}$ of $\ce{Cu(OH)2}$ is $10^{-19}$.
My Attempt
I think ...
- 292
2
votes
0
answers
65
views
Existence of single ion activities
I have used Davies equation to find what I believed was single ion activities and multiplied them on concentrations to define the thermodynamic dissociation constants for any kind of buffer to find ...
- 53
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 ...
2
votes
0
answers
514
views
Electrodes involving sparingly soluble salts (Electrodes of the second kind)
Consider the sparingly soluble salt, $\ce{AgI}$ ($K_\text{sp} = 8.52\times10^{-17}$) and a silver electrode (Standard Reduction Potential = $\pu{0.799V}$). $\pu{0.02L}$ of $\pu{0.001M}~\ce{KI}$ ...
- 652
4
votes
2
answers
458
views
How come ∆G ≤ 0 is used for spontaneity in electrochemistry, not ∆G ≤ W(other)?
The spontaneity condition for a system at constant temperature and pressure in which the only type of work accomplished is of the $pV$ type can be expressed as:
$$\Delta G\le0\tag1$$
In case of ...
- 41
-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
0
votes
1
answer
2k
views
Is equilibrium potential for K+ always ~-90 mV?
Equilibrium potential is the difference in charge relative to the inside of the cell. -90 mV means that the inside of a cell is more negative than the outside. However when you talk about equilibrium ...
- 183
2
votes
1
answer
517
views
Calculating Ratio of Stability Constants
Solution I contains a mixture of $\ce{FeCl2}$ and $\ce{FeCl3}$, and solution II contains a mixture of $\ce{K4Fe(CN)6}$ and $\ce{K3Fe(CN)6}$. The concentrations of iron-containing species satisfy the ...
- 7,402
3
votes
0
answers
779
views
Electrolysis of dilute and concentrated sodium chloride and the Nernst equation
Interested to know if there is a critical concentration at which $\ce{Cl-}$ will oxidise over $\ce{H2O}$ and if this can be determined using the Nernst equation.
That is, obviously if $[\ce{Cl-}]>...
- 31
2
votes
0
answers
5k
views
Calculating Solubility Product of AgCl from electrode potential
I have to use a measured electrode potential to find the solubility product of $\ce{AgCl}$. In our experiment, we first mixed one drop of $\pu{1.0 M}$ $\ce{AgNO3}$ with $\pu{10 mL}$ of $\pu{1.0 M}$ $\...
- 29
1
vote
1
answer
437
views
Analytical Chemistry Textbook Recommendation [duplicate]
Could anyone recommend a good book for self-learning that provide a clear, step by step guide on solving such chemical equilibria questions.
It should cover the following topics: weak acid and ...
- 7,402
2
votes
1
answer
2k
views
Why don't ions have one equilibrium potential? (Nernst equation)
I know that equilibrium potentials are dependent on the ratio of ion concentrations inside and outside of the cell and temperature. I also know that the equilibrium potential is reached when there is ...
- 56