Questions tagged [conductivity]
A material's ability to conduct electric current or thermal energy by any means.
205
questions
2
votes
0
answers
83
views
What is the ionic conductivity of the hydroperoxide ion?
Hydrogen peroxide is supposed to dissociate as
$$\ce{H2O2 <=> H+ + HO2-}$$
But I can't find a source for the conductivity, $\lambda$, of the hydroperoxide anion $(\ce{OOH-}$ or $\ce{HO2-})$ on ...
- 129
-3
votes
1
answer
112
views
Constituents of LaI2 [closed]
An ionic solid $\ce{LaI2}$ shows electrical conduction due to presence of which anions and cations?
- 9
1
vote
0
answers
29
views
Thermal conductivity and diffusivity of diatomite (also known as diatomaceous earth or kieselguhr)
Does anyone know where can I find measured thermal conductivity and thermal diffusivity of diatomite for different temperatures? I'm looking for the temperature dependency for temperatures higher than ...
- 11
-1
votes
1
answer
146
views
Study of superconductivity from organic compounds
What advancements have been made in understanding and applying organic superconductor materials?
Although traditionally superconductivity has been studied in inorganic materials, are there any organic ...
- 661
0
votes
0
answers
53
views
Can we add specific conductivities at any concentration?
Suppose we have specific conductivities of $\pu{0.1 M}$ $\ce{K+}$ and $\pu{0.1 M}$ $\ce{Cl-}$. Can we add their specific conductivities to get specific conductivity of $\pu{0.1 M}$ $\ce{KCl}$?
- 17
1
vote
1
answer
127
views
How do the ions in electrolytes lead to lower dielectric constants compared to pure water?
I am interested in the salts used in the gel electrophoresis buffers. As I understand it, one of their roles is to change the conductivity of the medium, because otherwise the electric field would be ...
- 119
0
votes
0
answers
22
views
will adding metal nano particles to a CNT-polymer matrix increase the conductivity of the polymer?
I was wondering would just physical mixing of metal nano powders with MWCNT in a polymer matrix improve the conductivity of the said polymer? Would the metal particles interact with the CNT network. I ...
- 59
1
vote
1
answer
60
views
What has caused a plateau in the lead up to the equivalence point of a conductometric titration?
In a titration of HCl against NH3OH, conductivity had increased in a linear fashion (think y=x), and before it approached the equivalence point, there was approximately 0.8mL of 'plateau'. Before ...
- 19
1
vote
0
answers
122
views
Why is the conductivity of NaCl, NaBr and NaI decreasing with temperature?
I collected the conductivity of NaCl, NaBr, and NaI from 30 celsius to 80 celsius. I used the solutions mixed in water.
In all instances, the conductivity seemed to reduce as the temperature increased....
- 21
1
vote
0
answers
48
views
What is the highest temperature, ambient pressure type-1 superconductor as of 2022?
I was curious about the highest known Tc for type 1 superconductors.
This list suggests lead near 7K is as good as it gets for type-1 superconductors but I wonder if that is true given the current ...
- 269
1
vote
1
answer
149
views
On the definition of Molar conductivity
The textbook I follow defines the conductivity, $\kappa$, as
$$\text{Conductance} \ G=\frac{1}{R}=\kappa \frac Al$$
The inverse of resistivity, called conductivity, is represented by the symbol $\...
0
votes
1
answer
359
views
Degree of dissociation and conductance
My book says ratio of molar conductance at a given concentration of solute and molar concentration at infinite dilution is equal to degree of dissociation for weak electrolytes.
I understand it ...
- 1
0
votes
1
answer
127
views
How can we define molar conductivity as the conductance of 1 ml of electrolytic solution?
I've been taught that conductance ($G$) of an electrolytic solution is the inverse of the resistance of the solution, and conductivity ($\kappa$) is the inverse of the resistivity. From this, we have
$...
- 294
2
votes
4
answers
872
views
What non-toxic non-corrosive liquids are used for heat transfer?
I have a steel vessel placed concentrically within a larger steel vessel, resulting in air-filled annulus (air gap) between the two vessel walls (figure below). Due to the existing vessel construction,...
- 187
3
votes
1
answer
242
views
Why do we define molar conductivity?
I've learnt about conductivity and molar conductivity in school.
I know that conductivity is the conductance of a solution of unit volume/ of unit cross-sectional area and distance between the ...
- 215
0
votes
0
answers
78
views
Continuous measurement of urea concentration in water
My colleague and I are working with fertilizers, and we are trying to continuously measure the concentration of urea in water (In situ concentration as function of time). There are two condition that ...
- 213
0
votes
2
answers
3k
views
Electrical conductivity of a NaOH solution
We are doing a simple water electrolysis experiment but I have issues with the electrolyte solution.
Took 450ml of distilled water and slowly dissolved 50g of NaOH until heating ceased. If I'm not ...
2
votes
2
answers
297
views
Conductometric titration curve plotting
In the conductometric titation of HCl vs NaOH, the conductance initially decreases, reaches a minimum at equivalence point, and then the slope of the curve becomes positive:
Source: https://chart-...
- 368
6
votes
0
answers
146
views
Why is the rubber tip of my capacitive stylus no longer conductive?
In 2014, so eight years ago, I bought five styluses from China. Cheap stuff obviously. They worked fine while I used them, but soon after they were just left in a drawer. Last night I realized that ...
- 377
4
votes
0
answers
79
views
Linearity of electrochemical cells and electrical conductivity measurement
I've measured the output signal of a few commercially available conductivity meters and was surprised to see that the signal was typically a square wave of amplitude in the range of 1.5 to 6 Vpp (peak-...
- 41
0
votes
0
answers
26
views
What is the net gain of charge carriers in a semiconductor if an atom is removed?
In pure germanium, all Ge atoms are bonded with a tetrahedral geometry. It has a band gap and is a semiconductor. If we remove one Ge atom, what type(s) and how many charge carriers will be generated? ...
- 1
0
votes
0
answers
271
views
Why is polystyrene (PS) an electrical insulator
The reason behind why graphite is electrically conductive is as ancient as the age of the Queen: that, electrons inside the benzene ring are delocalised.
However, if one looks the repeating unit of ...
- 127
1
vote
0
answers
21
views
Descriptive explanation of different Carbon Nanotubes Conductivity
I'm soon having a talk about Carbon Nanotube FETs and wanted to give a short introduction into CNTs in general. Of course for device operation it's important that some types of single-walled CNTs are ...
- 43
0
votes
0
answers
36
views
Commercially available conductive polymers
I am looking for intrinsically conductive plastics (not plastics that are made conductive by filling them with carbon black for example). I have found that there are conductive polymers like ...
- 151
5
votes
1
answer
347
views
Molar conductivity calculation in a titration curve
At an exam for analytical chemistry, I was asked to calculate the molar conductivity of a solution for an ongoing titration. I just solved it the way our professor showed it to us but I have some ...
- 276
0
votes
0
answers
24
views
Literature recommendation - non-stationary heat transfer in porous solids
I am trying to calculate a non-stationary heat transfer to a porous spheres by conduction.
These spheres are placed in a thin metal tubes with a known heat capacity. Hot/cold air (or similar gaseous ...
- 133
0
votes
1
answer
694
views
Why does temperature increase rate of electrolysis even though resistivity of electrodes increase?
My experiment is just the electrolysis of iron rust at different temperatures. It consists of a rusted iron cathode and an iron anode in a salt water solution. From my data, there is an approximately ...
- 27
2
votes
1
answer
368
views
Why is 1413 µS/cm specifically the "standard" conductivity standard?
I'm doing some work on conductivity sensor calibration, and noticed that all the conductivity standard suppliers offer a 1413 µS/cm standard solution. Why is this oddly specific value the "...
- 123
2
votes
0
answers
77
views
Characteristics of metals compatible with semiconductor grade Ultra Pure Water (UPW)?
I am looking to build a water conductivity sensor for semiconductor grade Ultra Pure Water (UPW). UPW conductivity sensors already exist, but because of price and low water volume I need to fabricate ...
- 471
-1
votes
1
answer
64
views
Why doesn't NaCl work for electrolysis? [closed]
So I found out online that to increase the conductivity of water for electrolysis, NaCl or NaOH is used.
However, upon using a low amount of NaCl in water and passing 12V through the solution, I ...
user117807
0
votes
1
answer
595
views
Why is copper a better conductor of electricity than calcium?
How would we compare the electrical conductivity between copper and calcium? I understand that electrical conductivity of a metal is dependent on the number of delocalized electrons for that metal. ...
- 242
1
vote
1
answer
429
views
Is this true for conductivity of mixture of two solutions equal to the sum of conductivities of each solution?
Suppose $\ce{Na2SO4}$ has a conductivity $\pu{2.6 \times 10^{-4} S cm-1}$ and on mixing $\ce{CaSO4}$ to saturation, the conductivity becomes $\pu{7.0 \times 10^{-4} S cm-1}$.
So, Is the conductivity ...
- 111
1
vote
0
answers
197
views
Ionic mobilities and conductivities of lithium and potassium cations in acetonitrile–propylene carbonate solution
Recently I calculated the ionic mobility and molar ionic conductivity values for $\ce{Li+}$ and $\ce{K+}$ cations in an acetonitrile–propylene carbonate binary mix solution (8:2 molar fraction ratio).
...
- 59
2
votes
0
answers
261
views
Why does conductivity of a solution of sodium in liquid ammonia decrease with a decrease in temperature?
What happens to the conductivity when a solution of sodium in liquid ammonia at $\pu{-33^{\circ}C}$ (Boiling point of ammonia) is further cooled?
I expected the solution to behave as any other ...
- 963
1
vote
0
answers
36
views
Can alkali-doped exohedral fullerene molecules show superconducivity?
Alkali doped fullerenes are one of the few organic materials that show superconductivity. However, when attaching a new molecular system to a fullerene doped with an alkali metal, will it still show ...
- 699
18
votes
1
answer
3k
views
Why does the graph of the electrical conductivity of sulfuric acid/water solutions have this knee in the ~85%-~92% range?
This answer to an earlier question regarding the electrical conductivity of sulfuric acid provides a graph showing the conductivity of sulfuric acid/water mixtures ranging from 0% to 100% sulfuric ...
- 479
23
votes
3
answers
3k
views
Is "Sulfuric acid... makes a poor electrolyte... very little of it will dissociate into ions" really true? What does that actually mean?
While researching chromate conversion coating for edits to this answer in Space Exploration SE, I came upon the following passage in Corrosion Resistance of Stainless Steel to Sulfuric Acid
Sulfuric ...
- 5,742
1
vote
0
answers
83
views
High symmetry points and x-coordinates
Is it possible to work out the x-coordinates related to high symmetry points?
The software I'm using doesn't provide me with that, so I was wondering if there is a way to manually figure it out, as I ...
- 11
1
vote
0
answers
95
views
Is there a relation between polarity of molecules and their electric susceptibility?
So it is written in our text that electric susceptibility ($χe$) (the response of say water molecules in the presence of an external electric field) is related to the molecular behaviour of various ...
6
votes
1
answer
178
views
How exactly does electrolysis occur if the molar conductivities of cation and anion are different?
I'm having trouble wrapping my head around Kohlrausch law of infinite dilution and molar conductivities in general.
For a salt $\ce{AB}$ the molar conductivity at infinite dilution can be expressed as ...
- 963
2
votes
2
answers
575
views
Temperature Dependence of The Conductivity of Electrolytic Solutions
I have learned in my chemistry text books that the conductivity of electrolytic solutions increase with the increasing of temperature because the ions of electrolytic solution move faster by getting ...
1
vote
0
answers
107
views
Pressure vs electric conductivity in solids
If we apply pressure to a solid, does it change its electric conductivity? I am asking this because in 2020 they announced a superconductor at room temperature but under a pressure of 3/4 of the ...
- 137
0
votes
2
answers
397
views
Conversion factor for conductivity of an aqueous solution [closed]
I am not 100% sure if this is the right place to ask, but please point me in the right direction if not.
I am designing a conductivity meter, and when it comes to displaying the results in mS/cm or µS/...
- 119
1
vote
0
answers
553
views
Why do 4d and 5d metals have more orbital overlap than 3d because of size?
When considering the electrical conductivity of metal oxides, they will conduct better if the metals orbitals can reach each other to overlap. Whether this can happen is contributed to by a couple of ...
- 276
4
votes
0
answers
160
views
Why is ruthenium dioxide a conductor while titanium dioxide is an insulator?
Ruthenium dioxide has the same crystal structure as rutile (titanium dioxide), and the metal atoms are in the same oxidation state. Yet ruthenium dioxide is a metal-like conductor (its resistivity is ...
- 213
6
votes
1
answer
2k
views
Why does the specific conductivity against concentration curve for NaCl curve more than KCl?
I understand why KCl has a higher specific conductivity than NaCl.. but I dont understand why the curvature is more significant for NaCl (KCl is a straight line). Ive provided a picture of this here, ...
- 81
6
votes
2
answers
203
views
How to relate the conductance of an aqueous electrolyte to its conductivity
In this answer on Physics Stack Exchange, the author states that conductance $G$ is related to conductivity $\sigma$ by $$G = \sigma\frac{A}{l}$$
where $A$ is the cross-sectional area perpendicular to ...
- 1,043
0
votes
2
answers
728
views
Precise estimation of air properties as a function of temperature at 1 atm
Are there any tables with empirical equations to calculate properties of air as a function of a temperature at 1 atm?
For example, NIST provides such equations for a large number of gases, but I was ...
- 133
1
vote
2
answers
2k
views
Understanding strong acid titrated with weak base graph
I don’t understand why the conductivity doesn’t change after the equivalence point. To my understanding, at the equivalence point there is $\ce{NH3}$, $\ce{NH4+}$ and $\ce{Cl-}$ in the solution. As ...
- 123
1
vote
1
answer
789
views
Determination of Cell constant
I read that cell constant is measured indirectly using a solution with known conductivity(like KCl).
But then how was the conductivity of that solution measured? (Is it by some theoretical ...
user102687