Questions tagged [conductivity]

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

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58 views

Why does the electrical conductivity increase as the temperature decreases?

I am measuring the dependence of electrical conductivity of ( NaCl and $\ce{CH3COONa}$ solutions with concentration 9g/L) with temperature using conductivity meter. Theoretically the conductivity ...
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146 views

Electrical and thermal conductivity of graphite

I was reading about carbon family where it was mentioned that electrical conductivity of graphite increases with temperature while thermal conductivity decreases. However, I could not find a suitable ...
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83 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
5k views

How well (or poorly) does natural leather insulate?

What is the general thermal conductivity of animal skin leather? I understand there are many different animal's skins (cow, sheep, buffalo, deer, pig), but in general, does natural leather insulate ...
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2k 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{...
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3k views

What is the electrical conductivity of pool water?

What is the electrical conductivity of pool water? I tried to find some information, unfortunately without success. I need to know it to make an underwater electronic project.
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1answer
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What should be the order of specific conductance (κ) of floride, chloride and bromide ions?

The equivalent conductance order is $\ce{Br-} > \ce{Cl-} > \ce{F-}$. $$Λ = \frac{κ}{c},$$ so $Λ$ is proportional to specific conductance? But in ion chromatography we get peak area where $\ce{...
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1answer
478 views

Intensive and Extensive Properties--Resistance

Is resistance an intensive quantity or an extensive one? And why? Let me present 2 scenarios. Resistance of a wire: The resistance of a wire depends on area and length. This implies it depends on the ...
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1answer
1k views

How is solid titanium(II) oxide an electrical conductor?

Most salts in the solid state are electrical insulators, since the ions are not mobile (e.g. sodium chloride). However, solid titanium(II) oxide, $\ce{TiO (s)}$, is a conductor. How is this so?
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153 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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1answer
865 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 ...
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1answer
81 views

Is the electrical conductivity only measurable in aqueous solutions? [closed]

I have been looking for other ways to measure it, but all I've found is through aqueous solutions. So I want to know if there's another way to do it, or why it isn't possible through other means.
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99 views

Why do metallic elements have a very small band gap while nonmetallic elements have a large band gap?

I recently was going over solid state bonding and conductivity. I was wondering why metallic elements (such as sodium, iron, etc.) have a small band gap / no band gap (as conductors that have the ...
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1answer
547 views

Kohlrausch Law and conductivity

Im writing up a lab report at the minute and part of it concerns ions in solution and how they affect conductivity. I've been doing lots of reading and I think ive got the grasp of most of it, but its ...
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125 views

Factors that influence the electrical conductivity of metals

The electrical conductivity of metals is a physical property of these materials. Much of the theory used to explain the electrical conductivity of metals is also based on physics understanding. ...
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1k views

Does ethanol conduct electricity? [duplicate]

I am trying to find out about methylated spirts/denatured alcohol. As far as I can fine, methylated spirits is roughly 95% ethanol. Will it conduct electricity? I have done some research, but I have ...
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222 views

Molar Conductivities of H+ and OH- V/S other Ionic Electrolytes [duplicate]

The following table gives the Ionic Molar Conductivities of a few electrolytes in water. What are the reasons for the unusually high values for both H$^+$ and OH$^-$ even though both undergo solvation ...
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154 views

Conductive hydrophobic material

I was looking for a conductive hydrophobic material if there is one? If not why? I was researching and I found some material about laser etching on metals that causes superhydrophobicity but that I ...
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29 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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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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484 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), ...
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807 views

Is superglue a good thermal insulator?

How good of a thermal insulator is superglue compared to other materials like ceramics, plastics, and metals? I know this might not seem like a chemistry question, but I was hoping someone here could ...
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1answer
8k 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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Graphene Vs Copper?

I was wondering about the amazing conductive properties of graphene, lets assume a large copper bar that is 10 kg, current of 1kA and probably more can flow in it, what about graphene? It certainly ...
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1answer
2k views

Difference between equivalent conductance and equivalent conductivity [closed]

I find questions in my book which ask for the equivalent conductivity and sometimes for the equivalent conductance. And then when I look at the solution, they've used the same formula for both. This ...
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2answers
2k 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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3answers
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Soil conductivity: How do I get a near equivalent between meq/100 g to mS/cm?

I have two soil reports, one that reports CEC as 45 meq/100 g and another that reports 6 mS/cm using 1:1 water soil. I can see that the two are, if not apples and oranges, they are at best tangerines ...
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1answer
341 views

Decrease in molar conductivity with increase in concentration

Why does molar conductivity $Λ$ for strong electrolytes decrease with increase in concentration? I mean, more concentration would mean higher number of solute particles present in the solution, and as ...
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1answer
34 views

Contradiction in variation of conductance and conductivity on dilution

I do conceptually understand that on dilution conductivity decreases and conductance increases but if we look at the formula of conductivity, a contradiction seems to arise. $$\kappa=GG^*$$ where $\...
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1answer
58 views

A gram of salt added to pure (distilled) water introduces around $2 \times 10^{22}$ ions? [closed]

I am currently studying Practical Electronics For Inventors, Fourth Edition, by Scherz and Monk. Chapter 2.5.2 Resistivity and Conductivity, claims the following: Adding an ionic compound in the ...
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1answer
37 views

Which conductivity law should I use to calculate the conductivity of a solution with high/low concentration?

I have a set of NaCl solutions with concentrations ranging from 0.05 M to 0.1 M. I have been trying to calculate the conductivity of these solutions and compare the obtained values with the ...
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1answer
7k views

Calculating conductivity of a solution given molar conductivities and concentration

From my understanding the conductivity of a solution ($K$) is given by the sum of the conductivities of ions in solution: $$K = c(K_{m,1}+K_{m,2})$$ Where $c$ is the concentration, and $k_{m1}$ and $...
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1answer
114 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 ...
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1answer
1k views

Electric conductivity vs potential

What is the relationship between electric potential and conductivity? For example, gold has a more negative electric potential than silver (-1.100 vs -0.800), but silver is a better conductor.
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1answer
51 views

Feasibility of using ionic liquid fuels in an MHD type reactor

First off I would like to say that my knowledge on chemistry, even general chemistry, is basic if not poor. That said, I have some intuituions on this matter. I haven´t found any paper regarding ...
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1answer
32 views

Silver in defect chemistry

When talking about conductivity in combination with lattice defects you can often see that AgX is taken as an example for a Frenkel defect where the $\ce{Ag^+}$ moves to intersticial voids. I remember ...
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2answers
7k 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 ...
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1answer
382 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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25 views

Specific conductance of KCl

Question: A conductivity cell containing distilled water has a resistance of $\pu{454 k \Omega},$ while the same cell containing $\ce{KCl}$ solution prepared in the same sample of water shows ...
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30 views

Electrical conductivity and the limits of Kohlrausch's law

I am currently writing a lab report on electrical conductance and I realized that my partner prepared $\pu{0.1 M}$ solution instead of $\pu{0.01 M}$. Now, I am supposed to find the molar conductivity ...
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37 views

Water replacement for pressure-testing [closed]

Due to circumstance, our Data Centre build has some delays and it currently looks like we're going to have to perform a hydrostatic test of our sprinkler system with live computers in it. As I have ...
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36 views

Investigating the effect of solvents on the alkaline hydrolysis of ethyl acetate

In the following reaction, I believe a polar aprotic solvent like propanone will be more favorable since the partial negative charge on the oxygen atom in propanone will attract the sodium ion from ...
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418 views

Which is more conducting - molten sodium chloride or molten magnesium chloride? [closed]

Which is more conducting - molten sodium chloride or molten magnesium chloride? I'm pretty sure I know the answer to this but my problem is putting into words. Magnesium is more conductive due to its ...
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0answers
103 views

Conductivity variation on Caustic (NaOH) Dilution System

I am reading the drawing for an automatic caustic dilution system where 50% NaOH is diluted down to 20%. I was expecting to see a density sensor on the outlet to provide feedback to the dilution ...
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35 views

Looking for a theory predicting conductivity values of electrolytes at higher concentrations

I'm looking for a theory to calculate the electrical conductivity of electrolytes, namely $\ce{NaCl}$ and tartaric acid ($\ce{C4H6O6}$) dissolved in water, depending on their concentration. The only ...
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118 views

Why does conductivity of electrolyte solutions peak at high concentrations?

I've recently done a lab about conductivity of brine over time (high concentration salt water). I passed current through salt water and measured the current over time. The graphs I got showed that ...
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426 views

Measurement of cell constant

Why is cell constant value measured through indirect methods (like using a solution whose conductivity is already known)? Isn't it easier to measure the length and area of cross section of a ...
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119 views

NiO and ZnO electrical conductivity with oxygen pressure

NiO is a Mott-Hubbard insulator and increasing oxygen concentration leads to anion excess and oxidation of Nickel so electron hopping is more favourable so electron repulsion is reduced and it becomes ...
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1answer
147 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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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 ...