Questions tagged [conductivity]

A material's ability to conduct electric current or thermal energy by any means.

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9
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2answers
455 views

Why do we do electrolysis and electroplating using warm electrolyte?

This is a pretty basic question, and I know it has something to do with conductivity, but I'm not quite sure how they are related.
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1answer
3k views

Calculate limiting molar conductivity of BaCl2

How can I calculate limiting molar conductivity of BaCl2 in water at 25 degree Celsius? I have got a formula for calculating limiting molar conductivity . limiting molar conductivity = V+ A+ + ...
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1answer
134 views

Proper definitions of resistivity of conductivity

Is resistivity the same as specific electrical resistance? And conductivity is same as specific conductance when I am dealing with electrical properties ?
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1answer
6k views

Can solutions of polar covalent compounds conduct electricity?

I learned in class that solutions of polar covalent compounds are weakly conductive, while ionic solutions are strongly conductive. But I'm getting different answers online. According to this lecture,...
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2answers
8k views

Why is fullerene 60 an insulator while graphite is a conductor?

Graphite is good conductor of electricity because one carbon atom is bonded only three carbon atoms, which enables the presence of free electrons. In fullerene 60 the carbon atoms are also bonded to ...
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0answers
132 views

Proof of Concentration dependence of molar conductivity

If we go by the simple electron model, Conductivity/Concentration=carrier charge*mobility and mobility is only dependent on temperature for electrons. My question is regarding strong electrolyte, I ...
3
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1answer
1k views

Finding out pKa of acid from molar conductivity

I'm reading about the electrical properties of solution where there is a problem like that: The molar conductivity of $0.0250\ \mathrm M$ $\ce{HCOOH(aq)}$ is $4.61\ \mathrm{mS\ m^2\ mol^{-1}}$. ...
3
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1answer
99 views

What kind of unit is this [A*m^2/mol]?

I found a term on this website that gives a unit of [A*m^2/mol]. The equation is: $k_d^{eff}=\frac{2RT\kappa^{eff}}{F}(t^+-1)\left(1+\frac{\text{d}\ln(f)}{\text{d}\ln(c)}\right)$ where R is the gas ...
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0answers
32 views

ZnO layer as a passivity layer

I have bought a zinc sheet and with SEM I can see a ZnO layer, which is a passivity layer. But when I connect this sheet to a conductive wire, le zn sheet is conductive too. Is that normal ? the ZnO ...
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0answers
21 views

Which contributes more strongly to ionic conductivity, charge or mobility?

Conductivity depends on the magnitude of charge as well as mobility. Which will be the dominating factor in the case of opposite trends in these two properties?
4
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1answer
950 views

Why do gases under low pressure conduct electricity?

In J. J. Thomson's cathode ray experiment, he used a discharge tube in order to make the gas inside conduct electricity. Why do gases under low pressure conduct electricity?
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0answers
94 views

Conductive liquid, that after evaporation will allow me to use my gloves with a smartphone

I'm looking for a conductive liquid that, after it evaporates, leaves the material that has been exposed to it conductive. I'd like to use my smartphone with gloves. I do have a pair of professional,...
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2answers
268 views

How do ionic solution conduct?

Do ionic compounds use ions to conduct? Or do they use electrons? Also why don't they conduct in solid form and only in liquid or gaseous forms? I mean electrons can still travel in solid forms. Do ...
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3answers
12k views

What is the difference between molar conductance and molar conductivity?

I'm learning (or at least trying to learn) about electrochemistry, but a major obstacle to that, is that different books I refer use different terms for the same symbols. So in a last ditch attempt to ...
2
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1answer
929 views

What is the difference between λ and Λ with regard to molar conductivity?

I came across these equations (boxed in red) in a book: $$ \begin{align} &\therefore & t_\mathrm{c} &= \frac{u_\mathrm{c}}{u_\mathrm{c} + u_\mathrm{a}}\\ &\text{and} & t_\mathrm{...
9
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2answers
12k views

Why is copper a better conductor than iron?

So metals are good conductors as the electron in their outer shell is loose and can plunge out of the atom with the application of the slightest force(voltage). Silver is the best metallic conductor, ...
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0answers
46 views

How does SOFC work?

The Solid Oxide Fuel Cell is a particular case in which an oxide is used as a conductor. Once i've heard that oxides usually aren't good conductors but it turned out that a lot of oxides are ...
2
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0answers
28 views

On what basis are certain elements selected for doping silicon?

I read online that transistors are made by doping silicon with other elements such as arsenic, phosphorus, or aluminium in order to increase its conductivity. How are these doping materials selected?
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1answer
96 views

How can a conductivity experiment have higher voltage than battery?

I did an experiment where I tested the conductivity of different solutions and some substances. We connected a 9 bolt battery, some aluminum foil sticks, and a multimeter that reads the voltage. It ...
5
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1answer
633 views

Formation of Bands in Semi-Conductors

At school, we are learning about semi-conductors and their applications in modern electronics. One of the features of semi-conductors is that there is a small energy gap between the valence and ...
3
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0answers
69 views

What makes ionic conduction fast or slow?

Sometimes in certain electric circuits (such as in voltaic cells) ions are moved around as well as electrons. I have a basic understand of what materials (mostly metals) conduct electrons well but ...
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2answers
6k views

Conductometric titration of Strong Acid And Strong base

Consider conductometric titration of Strong Acid with strong base say HCl + NaOH. My question is why initially the conductance decreases. If H+ of HCl is consumed by OH- of NaOH, forming water and ...
3
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1answer
960 views

Why are metals conductive in terms of orbitals?

Back in high school I was taught a definition of metals: Metals are a lattice of positive nuclei embedded within a sea of delocalised electrons Metals are conductive because the electrons aren't ...
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1answer
103 views

Where did I go wrong in the following calculation for molar conductivity?

Resistance of a conductivity cell filled with $0.1~\rm{mol\, L^{–1}}\ce{KCl}$ solution is $100~\Omega\;.$ If the resistance of the same cell when filled with $0.02~\rm{mol\, L^{–1}}\ce{KCl}$ solution ...
2
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1answer
135 views

Conductivity of Wüstite

"Wüstite is often represented as $\ce{Fe_{1-x}O}$, where $x$ is some small fraction less than unity. In this nonstoichiometric $\ce{Fe_{1-x}O}$ material conduction is electronic and the material ...
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0answers
943 views

Why does sodium chloride not conduct as much as aluminum chloride in water?

I understand how $\ce{NaCl}$ and $\ce{AlCl3}$ dissolves in water but I'm wondering why one is more conductive than the other. Is it their extra ions to conduct the electricity? I know that in $\ce{...
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1answer
3k views

How can one make graphene cables?

You might have seen in the short 2 minute video here: billionsinchange.com/solutions/limitless-energy that the Billionaire Founder (net worth $4 billion) Manoj Bhargava talks about creating cables ...
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1answer
287 views

aluminum hydroxide as an electrolyte

A friend and I recently produced some aluminum hydroxide, $\ce{Al(OH)3}$ for a project, and we wondered how it functions as an electrolyte. We know it has a low conductivity and solubility, but we ...
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0answers
38 views

Is there a material that turns from being electrically conductive to non-conductive irreversably upon exposure to some form of radiation?

For my project I am looking for a material which can turn from being electrically conductive to nonconductive (has to be irreversible) upon exposure to electromagnetic radiation (say UV). I tried ...
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0answers
230 views

Reduced Graphene Oxide (RGO) Conductivity vs Everything Else

Reduced Graphene Oxide (RGO), is the reduced version of Graphene Oxide (GO). Both RGO & GO are easily manufactured when compared to the complex process used to manufacture the 'atom-thick' ...
2
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1answer
890 views

Why does Ga improve conductivity of Ge? [closed]

This is for my AP Chemistry course and the question is: Which of the following elements is important in the semiconductor industry to improve the conductivity of Ge? K Ga Al Mg ...
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0answers
187 views

How does a metal atom's size affect the electrical conductivity of it's giant metallic structure?

In giant metallic structures, how does a metal atom's size affect the structure's electrical conductivity? (i.e. what happens if you go down a group of metal elements?)
4
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1answer
112 views

Negative Ohm reading from a Electrochemical reaction?

The purpose of my experiment is to determine which salt is the best electrolyte. The setup is a tarnished spoon (Ag2S) is placed on top of thin plastic pieces that separate it from a container coated ...
2
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0answers
70 views

If a conductivity meter is calibrated with aqueous standards, can it be used to measure the conductivity of an organic-based solvent system?

Trying to figure out if the calibration solutions for a conductivity probe/meter must be of a similar nature to the system which will be measured. I can only find aqueous calibration solutions online, ...
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4answers
4k views

Does an electrically conductive gas exist at room conditions?

As I know, the gases are insulators, because their particles are mainly electrically neutral, and thus there is no movable charges in them. But maybe it shouldn't be always so, for example if a gas ...
9
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1answer
300 views

Does the delocalization of p-orbitals ensure conductivity?

For example, polyacetylene is a conjugated system, i.e. with de-localized p-orbitals, but accroding to Chiang et. al. (1977) polyacetylene is semiconducting, and becomes conductive only when doped ...
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0answers
452 views

How to measure resistance of a gel electrolyte using a multimeter [closed]

How can I measure the resistance of a gel electrolyte using a multimeter? I know the formula to measure the conductivity of a gel electrolyte is k = (1/R) * (d/a) where k is the conductivity (S/cm), ...
3
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1answer
151 views

Improving copper contact and preventing oxidation

I have a model railway in which I use pure copper on the tracks and in the engine to power the train with electricity. Is there any solution to prevent the copper surfaces from corrosion, and maybe ...
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2answers
1k views

Photoconductivity of Selenium

Selenium is a good conductor of electricity in presence of light. This phenomenon is called photoconductivity. How does this phenomenon occur? Are there any other elements or compounds in which this ...
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1answer
288 views

What are some good references on conductometry as an analytical technique?

Non of the standard undergraduate textbooks in analytical chemistry (such as Skoog, Harris) discusses conductometry as an analytical technique. I wonder whether this technique is obsolete. Or is it ...
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4answers
9k views

Why is it that the least reactive metals are the best electrical conductors?

Silver, Gold and Platinum are amongst the best conductors of electricity, but also the amongst the most unreactive. Since electrical conductivity depends on the number of delocalized electrons (along ...
2
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1answer
803 views

Molar conductivity and concentration

For strong electrolytes, according to Kohlrausch, molar conductivity decreases as the concentration increases. ( i don't know why I'm not allowed to attach a photo here in order to show you the ...
5
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1answer
180 views

Behaviour of element 111

Is element 111 considered to act as an eka-aurum? Being under the same column of group 11, which usually provides enough evidence for correlation of properties for an eka-element, would this element ...
3
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1answer
889 views

Conductivity and Molar Conductivity of Equimolar Solutions of LiCl and KCl

If one took equimolar solutions of $\ce{Li}$ and $\ce{K}$, which would have higher conductivity? Is it the same for molar conductivity? Say, $\ce{LiCl}$ and $\ce{KCl}$, of a litre each. Also, as ...
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0answers
156 views

How to electronically calculate alcoholic level of a liquid

Is there any way to estimate the alcohol content of a drink with an electric test? Is alcohol in a liquid (e.g wine) dependent on the drink's conductivity?
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1answer
3k views

Electrical conductivity of pool water

What is the electrical conductivity of pool water? I tried to find some information, unfortunately with no success. I need to know it to make an underwater electronic project. Thanks
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0answers
114 views

What is the equation that demonstrates the relationship between molar conductivity and temperature?

Can someone please help me find the equation that defines the relation between molar conductivity and temperature. I have found some information, but it was not really that much complete.
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0answers
434 views

How to determine limiting conductivity of specific ions?

Given a table with equivalent conductivity of certain electrolytes, how can I determine the conductivity of separate ions? I know that you can find the difference between for example $\ce{K+}$ and $\...
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1answer
1k views

Is sodium hypochlorite solution an ionic solution - does it conduct current?

Does an aqueous solution of sodium hypochlorite conduct current?
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1answer
8k views

Why conductivity of electrolyte decreases on dilution, but molar conductivity increases?

I learnt that on dilution of an electrolytic solution, it's conductivity decreases. However, there is an increase in the molar conductivity of the solution. The book explained the reason by comparing ...