All Questions
Tagged with electrochemistry water
49
questions
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Neglected partial pressures dependence of water splitting
I am studying electrochemical water splitting and I have a huge doubt. The standard redox potential for the total reaction is 1.23 V, but this is in standard conditions, where the hydrogen and oxygen ...
2
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0
answers
45
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Alternative pH sensing methods?
I am looking for alternative methods to measure the pH of water (swimming pools, tap water, rivers,...) with (ideally) the following properties:
Durable: no maintenance or calibration required for 5-...
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1
vote
1
answer
166
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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 ...
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337
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Can deuterium be separated from heavy water via electrolysis? It is an isotope of hydrogen, so I guess it should act in the same way?
I was wondering if it is possible to separate deuterium from heavy water via electrolysis.
Also, is this the way deuterium gas is obtained on an industrial scale, or are there better methods?
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1
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NiCr wire and water
Suppose I'm a very impatient person and I want to heat up water by getting rid of the layer of isolation between a NiCr wire and the water (e.g. skinny-dipping). The idea is that, since the wires can ...
2
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0
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21
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Is there a difference in electrolsys rate limiting effects between electrodes of different area if one reverses the electrical polarity?
If one has two concentric stainless steel tubes with the small one being 1/2 the circumference and inside the other, and KOH for the electrolyte, then given the different surface areas between the ...
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2
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163
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Can stainless steel be electrically insulated with (oven-dried) Sodium Silicate Solution?
Can I electrically insulate stainless steel by painting Sodium Silicate solution on it and heating it to 200C for 30min or so?
The solution should be conductive, and I've been told (to be verified) ...
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1
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261
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Electrolysis of water using different kind of electrode and electrolyte safest as possible for splitting demonstration
I am planning to electrolyze water for an experiment. However, I have limited resources and want to do it as safely as possible
The resources that I have:
$\pu{12 V}$ DC battery
Graphite (in the ...
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4
answers
1k
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In electrolysis, why does each atom wait to turn into gas until they reach a particular electrode?
More specifically why don't bubbles of both oxygen and hydrogen appear everywhere?
If the electricity just breaks apart bonds wouldn’t the hydrogen and oxygen just immediately turn into gas and bubble ...
- 273
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1
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466
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How does strong acids conduct electricity in water?
How do strong acids conduct electricity in water?
I have just studied ionization of water and I'm confused about some points.
First: I know that water ionizes in a very small amount ($10^{-14}$) so ...
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5
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4
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1k
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Explanation for a basic decomposition of water experiment
My son is trying to write a conclusion for a basic decomposition of water experiment using a 9 V battery (with a test tube placed over each terminal) placed inside a salt water solution. The results ...
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2
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2k
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Does changing the electrolyte concentration in the electrolysis of water affect the speed that hydrogen gas is produced at the cathode?
I am currently completing a Year 12 Extended Practical Investigation. Due to the lock-down restrictions we are unable to complete our own practical experiment and have been given sample answers with ...
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1
answer
8k
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What happens when you put a battery in saltwater? [closed]
If somebody puts a battery in a salt solution, what path do the electrons take?
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6
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2
answers
208
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Protons and osmotic potential
In a hypothetical enclosed membrane only permeable to water (including hydronium), where inside the pH is lower than the outside, would water move inside?
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3
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262
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Does anyone know a database that shows the effect of electrolyte concentration on the production of hydrogen gas during electrolysis of water?
I'm currently studying in the International Baccalaureate model. This high school model asks their students to do an individual work called the Internal Assessment. One of the subjects I study is ...
-1
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2
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193
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Why is the ionic product of water $K_w$ the same in acid, water, and alkali? [duplicate]
Seen on the web:
The concentration of [H+] and [OH−] both vary based on the the composition (acid/alkaline) of the solution, but the remarkable thing is that their product does not. When [H+] goes ...
Rwi1
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1
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368
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Why does H2O electrolysis produce O2 on the anode instead of H2O2
If the oxidation of $\ce{H2O}$ produces $\ce{OH-}$ ions and the anode separates electrons from them leaving neutral $\ce{OH}$ molecules, why don't they bind to each other covalently?
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Electrolysis of water: Which equations to use? (IB Chem)
There is a list of standard electrode potentials at 298 K from the p. 23 of IB Data Booklet 2016. Which of the following equations (forward/backward reactions), from the two possible ones involving ...
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0
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261
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What is the ideal temperature and pressure to crack water?
Using sun mirrors and solar cells for electricity. What temperature, pressure and voltage ideal for cracking water.
Source: NPR
Source
Would it take more or less electricity to crack water under ...
- 1
12
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6
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592
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Is there any electronic component to water conductivity?
Answers to Decrease in temperature of a aqueous salt solution decreases conductivity indicate that the electrical conductivity of salt solutions arises from the mobility of ionic species and therefore ...
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3
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1
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Calculating the standard reduction potential for the oxidation of water
I was working with Latimer and Frost diagrams for oxygen when I came across what seems to me a contradiction.
From the Latimer diagram for oxygen below, we know the standard reduction potential for ...
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1
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10k
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Best Settings for Electrolysis of water
I want to electrolyze water as a personal project, but I have found conflicting power recommendations on google. Some sources recommended a higher voltage, claiming that higher amps will just destroy ...
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2
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water in redox reactions [closed]
why water can't react as anode , with metals , in a redox reaction?
while studying electrochemistry, i passed through a table with certain metals , all having voltage (potential energy) less than ...
2
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1
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Water electrolysis - what is happening to an iron anode?
So I made an experiment to find a good electrolyte for a water electrolysis.
I tried citric acid, which turned out to not produce any gases at the anode, I tried sodium hydroxide, which turned out to ...
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1
answer
86
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Corrosion rate of a metal in a liquid in relation to the size of electric current
I am trying to determine the formula for calculating the corrosion rate of a metal in a liquid in relation to the size of electric current that is passed between 2 metal plates. For example: we have 2 ...
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0
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1k
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What gases would be produced from the electrolysis of distilled water and sodium bicarbonate? [closed]
I have two questions: one practical question and one conceptual question.
1) I'm trying to set up an electrolysis experiment and I am trying to make sure I am going to end up with the gases that I ...
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2
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2
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1k
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Electrolysis of water - why not pure water?
In the electrolysis of water, $\ce{H2O}$ molecules are being reduced at the cathode (forming $\ce{H2}$ and $\ce{OH-}$) and oxidized at the anode (forming $\ce{O2}$ and $\ce{H_3O+}$).
It is said that:
...
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1
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2k
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Electrolysis of water with aluminum at the negative pole
I am doing electrolysis of water to collect the hydrogen and I'm running into a problem: on the positive side I'm using graphite from a pencil (I cannot use any other material because it corrodes too ...
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3
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2
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5k
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What exactly does κ stand for in this equation connecting solubility and molar conductivity?
I came across the following equation while studying electrochemistry ("Physical Chemistry" by Wallwork and Grant):
The solubility $s$ of a sparingly soluble salt can be determined from conductivity ...
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Water side-reactions in organic electrochemistry (redux) [closed]
(note: this is a reposting of part of my original post which I was told had too many questions in one post)
Please bear with me as I am a chemistry newbie, but I am autistic and have recently ...
1
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1
answer
65
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Is there Any Advantage to Using Multiple Steel Plates in an Electrolyzer?
If I have an electrolyzer (For water) is there any advantage to having additional steel plates in between the electrodes in solution? For some reason this appears to be a popular design and I'm not ...
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2
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1k
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How does one determine the probability of H⁺ to H₂O in pure water?
The ratio of $\ce{H+}$ to $\ce{H2O}$ is something around $10^{-8}$. How did people determine that?
You cannot use the $K_\mathrm{w}$, $\mathrm{p}\ce{H}$, $\ce{[H+]}$ ion concentration value to answer ...
user24673
2
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2
answers
567
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Is it possible to have electric field in water without having electrolysis?
Is it possible to have electric field in water (using electrodes with voltage difference) without having electrolysis in the water (or any other reaction)?
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1
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How much hydrogen or oxygen will be produced in the electrolysis of water?
Is there a way to exactly calculate the quantity of hydrogen or oxygen in a water electrolysis? I am thinking of a plain and simple electrolysis like an anode and cathode in salted water separating ...
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1
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7k
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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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2
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791
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Hydrogen Fuel Cell and Battery
For hydrogen fuel cell to produce electricity, hydrogen will need to be supplied to the anode. To split oxygen and hydrogen from water and obtain hydrogen, we need to use electrolysis. To use ...
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3
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1
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Formation of O₂, Water, and Electricity from Hydroxide?
The Clark Type Oxygen Electrode converts water, oxygen, and electrons into hydroxide via a hydrogen peroxide intermediate:
\[\ce{O2 + 4e^{−} + 2 H_2O -> 4 OH^{−}}\]
Which is the sum of:
\[
\begin{...
- 2,674
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1
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1k
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Why is water considered ionic in fuel cells but otherwise covalent?
If water, $\ce{H2O}$ is a covalent compound formed by sharing of electrons, why is it said (in case of fuel cells) that formation of water from hydrogen and oxygen is a redox reaction (transfer of ...
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4
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9k
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Ratios of produced gases in water electrolysis
I just did a little water electrolysis experiment at home by immerging two aluminum electrodes in water with a small amount of table salt. The voltage of the battery was 6 V.
What surprised me is ...
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1
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Salt concentration and electrical permittivity of water
We know that the electric flux density $D$ can be related to electric field intensity $E$ as
$$D = \epsilon(\omega) E$$
where
$$\epsilon(\omega) = \epsilon_0 \epsilon_r(\omega)$$
and $\epsilon_0$ ...
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2
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141
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Water purification procedure that does not involve a flocculant of any kind?
I have read about "electroflocculation" that uses less flocculant/alum, but is there a method – no matter how expensive or impractical – that uses no flocculant at all?
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3
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31k
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How does high-frequency electrolysis of water work?
I have read that combining the DC current with a high-frequency AC current, the electrolysis of water speeds up. Is this true? In that case, how is less energy wasted as heat? Or does it simply ...
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3
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Can an aqueous solution conduct electricity forever?
We know that pure water does not conduct electricity, but salt water is a decent conductor. This is commonly explained by saying that “the ions carry the current through the solution”, which is an ...
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Does the temperature of water change during electrolysis?
Applying an electric potential to impure water splits water into its constituents H/O.
Does the temperature of the electrolyte change during this electrolysis?
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If electrolysis splits water, why does only either hydrogen or oxygen (but not both) bubble up on one pole?
If electrolysis splits water, then that means that $\ce{H2O}$ is split into $\ce{H}$ and $\ce{OH}$ or $\ce{O}$.
How come that if a water molecule is split at e.g. the negative pole (anode), only the ...
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2k
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How can I produce hydrogen gas efficiently and cheaply?
I have been intrigued by one of the principles of chemistry lately- electrolysis. In my knowledge, electrolysis is a quite dangerous operation as the decomposition of water produces hydrogen and ...
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2k
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Is electrochemically activated water a real technology?
In essence what I'm asking is if the applications of Electrochemically activated water (ECA water) as a bactericidal-disinfectant is real and profitable (especially this last part). The principle at ...
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1k
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Extraction of hydrogen and oxygen from water
The apparatus that I am using is a glass container, with two electrodes,two glass cylinders, water, and a battery. In the glass container will be filled with water and two electrodes kept inside the ...
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1
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Identity of a green substance formed during electrolysis reaction?
I did a short experiment in which I connected a $1.5\:\mathrm{V}$ battery with 2 paper clips into a bowl of water to which I added salt. After a while, I saw a yellowish-greenish cloud inside the ...
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