The branch of chemistry that deals with the study of redox reactions and how they can be applied to generate electricity (in electrochemical cells) and to carry out non-spontaneous reactions using electricity (electrolysis).

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The conversion of energy during electroplating

I've made a test and i've faced a problem with a part of a question which says: "What is the conversion of energy occuring in electroplating? " I answered that it is conversion from electric energy to ...
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9 views

How does an Ion Selective Electrode work?

I have come across two explanations as to how an ion selective electrode works. For example let's take fluoride ISE. One theory says that F ions migrate through the IS membrane by using the vacant ...
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1answer
15 views

Using AC voltage for electroplating

As I know, in electroplating method, the type of voltage used is DC voltage. My question is, does replacing DC current supply by AC one affect the functioning of the cell? And why?
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50 views

Green color substance forming during electrolysis

A green-colored substance formed during electrolysis, wherein the electrolyte was magnesium sulfate and minerals in tap water. I did not have any leads to stick into the water, so I just put a 9 ...
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27 views

Can a fully charged battery return 0 amps? [on hold]

I have been thinking of batteries and looking in the web for a similar question/answer. Since there are many different types of batteries, my question is about the lithium ion battery. Is it possible ...
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2answers
48 views

Why does decreasing the distance between the electrodes in an electrolytic cell increase the rate of electroplating?

I did an experiment on the effect of the distance between the electrodes on the rate of electroplating in an electrolytic cell (copper electrodes with copper sulfate electrolyte). As I expected, when ...
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30 views

Electrochemical cell - a problem from a Science contest

I apologize for having to link a photo, but the text is too long and the drawing is essential to the exercise. I was able to solve several parts, but I still do not fully comprehend what is going ...
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22 views

Electroplating reaction

In electroplating, can a galvanic cell substitute the direct current supply? The process is to change iron metal to a silver one, but a galvanic cell is connected with the two electrodes.
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31 views

Calculating standard electrode potential

The question is as follows. 02 electrochemical cells A and B are being constructed using 3 standard electrodes which are given below. P and Q are metals(e.m.f. electromotive force) ...
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1answer
53 views

Making a non-CN dissolved gold solution ideal for electroplating

I've had success electroplating $\ce{Ni}$ and $\ce{Cu}$, but interestingly never $\ce{Al}$. My focus here is on plating with $\ce{Au}$, specifically onto an $\ce{Ni}$ surface. In general from my own ...
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2answers
71 views

Lithium batteries a reality - why not sodium, pottasium batteries?

Lithium batteries seem to be mainstream now, offering high energy density, high output current capability. Stepping down the periodic table there are alkali metals with greater electronegativity than ...
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1answer
50 views

Overpotential for photocatalytic water-splitting with TiO2

What is the meaning of overpotential in the context of photocatalytic water-splitting? That is light drives charge separation inside TiO2 and the generated electrons and holes react with water to ...
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1answer
45 views

Why is the cathode reaction required in a fuel cell?

So, at the anode of a fuel cell hydrogen is split into a positively charged proton and an electron. Then, there is the membrane which can let only protons through to the cathode, whereas electrons ...
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1answer
19 views

Does relative amount of lithium and cobalt oxide change in recharged battery?

There is a question on my assignment about stoichiometry. I spent 2 whole days searching and review this topic but still clueless. Reaction in lithium ion battery $$ \ce{Li(s) + CoO2(s) → LiCoO2(s)} ...
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99 views

Why does Mg react vigorously in NaCl solution and less so in water?

When you put $\ce{Mg}$ into water a few $\ce{H2}$ bubbles appear. But when you put $\ce{Mg}$ into a $\ce{NaCl}$ solution there is a vigorous release of $\ce{H2}$, why is this and what reactions are ...
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0answers
14 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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3answers
1k views

How does oil on the surface of water prevent rust?

I distinctly remember a side-by-side comparison from a book where there are two nails submerged in water, in two beakers: one nail had a layer of oil on top of the water, and that nail didn't rust; ...
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34 views

Few basic questions about ionic bonding and batteries (lead)

I've got a few very very basic questions about ionic bonds and their role in batteries. My assumptions (correct me if I'm wrong): Ionic bonds occur between a metal and a non-metal (the non-metal ...
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53 views

Question about theoretical modeling of photocatalysis

As a computational materials chemist studying photocatalysis, how close to realistic systems can your modeling get? I have a sort of high-level question about the theoretical modeling of ...
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1answer
53 views

How could a rechargeable battery recharge itself?

I'm an engineering student preparing for my graduation, in one step of my graduation project I used a rechargeable battery(1.2 volt), i was shocked when this battery is starting to recharge it self ...
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1answer
40 views

Does battery self discharge when connected?

I am an electric engineer, and I read about battery self discharge phenomenon. I was wondering whether a battery self discharge rate is the same when it is unconnected (i.e. in storage) and connected ...
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19 views

Standardizing a Residual Chlorine Ion selective electrode/ (Reposted)

I tried to see how big the difference was between the readings obtained with a meter standardized with one standard solution and a meter standardized with three standard solutions. I tried to measure ...
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3answers
31 views

protecting contact between aluminium and copper wires

The quarters in which I live has both aluminum and copper household wiring. This results in corrosion of the contacts and can lead to sparking, overheating, and even fire. Is there any way to ...
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1answer
35 views

Dry Hydrogen Production

I am building a set-up to produce a controlled flow of dry hydrogen. I'm aiming for around 99.5 percent purity. Am I right in thinking a PEM cell and Deterite drying tube should be fine for this? Or ...
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1answer
83 views

Why soak filter paper in K2SO4?

From a description of my experiment: Potassium iodide crystals are place in the middle of filter paper soaked with potassium sulphate and phenolphthalein. Two electrodes are placed on the filter ...
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18 views

Which type of ion is selectively discharged in dilute copper(II) sulphate solution?

The selective discharge of ions depends on 3 factors: Position of ion in the electrochemical series. Concentration of ion in the electrolyte. Type of electrode used in electrolysis. So, what my ...
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1answer
40 views

How are the chemical reactions of the table of standard reduction potentials experimentally determined?

My background: I've read several books and articles on electrochemistry and even do photoelectrochemical research in a lab, so I'm somewhat familiar with the concepts and techniques. In texts on ...
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12 views

Does Chlorate in most Electroplating solution eventually evolve to Perchlorate?

I've just decided that making perchlorates without using platinum-coated anodes is not feasible. But I've made enough chlorates and poured them in my copper electroplating solution (and eventually ...
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1answer
51 views

Separating nickel coin into copper and nickel components

I'm trying to create a high school level lab in which we separate the metals in an alloy. The objective is to understand and apply standard reduction potentials, and also to do some extra redox ...
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1answer
33 views

Why is lithium plating irreversible in Li-ion cells?

Several sources (1, 2) suggest that charging Li-ion batteries in low-temperature conditions result in lithium plating. This seems pretty logical since low temperature reduces ion mobility, and ...
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1answer
37 views

Determining number of electrons transferred

When determining the number of electrons transferred in a redox reaction is it the total in both half equations? For example: $$\ce{2I- + Zn^2+ -> I2 + Zn}$$ First we split it up into the two ...
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1answer
168 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
24 views

Electrode Potential Half Reactions

Does flipping a reaction as written change the sign of the value of E or is it a completely different value? For example if I have the value for the half reaction $\ce{Cl2 + 2e- -> 2Cl-}$ but ...
2
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1answer
56 views

Bulging Li-ion battery – is it an immediate danger? What’s the likelihood of explosion?

I have a macbook battery that shows as completely dead (doesn’t hold the laptop on even for a second). It now started bulging, and in last week it inflated to about 50 % extra thickness, like this – I ...
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28 views

Can Electrolysis be used to produce -OH

Water that is broken apart with electrolysis, will produce: Two atoms of hydrogen, which bond together to make di-hydrogen ($\ce{H2}$) or ($\ce{H-H}$) 1 atom of oxygen, or monatomic oxygen ...
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20 views

Does Fluoroborate gets used up in Electroplating

I've been working on Tin electroplating on the side for a while now. I've formulated a mix from my usual electroplating formula template. The mix stubbornly keeps on having the Tin ions form Tin ...
2
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22 views

Thickness of oxide coating through anodising - voltage dependence?

In titanium anodising, solid titanium reacts with the oxygen formed at it's surface (to form titanium (IV) oxide or $\ce{TiO2}$) through the electrolysis of water. Experimentation and research has ...
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1answer
37 views

Will oxidation/reduction of copper still occur in an electrochemical cell if it is not in an aqueous enviroment?

Notation of the reduction and oxidation of copper typically includes the aqueous state. Illustrated below: $$\ce{Cu(s) -> Cu^2+(aq) + 2e-}$$ This event usually occurs at 0.34 V. What if the copper ...
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46 views

I performed electrolysis with aluminum, copper, and saturated salt water what is the left over murky liquid?

Okay, I'm a elementary student and I respect online answers, science is pretty much my strong point but I stumbled a bit when I connected the aluminum to the positive terminal, copper to the negative ...
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1answer
3k views

Could milk rust a steel teaspoon?

Recently, while cleaning a neighbour's fridge (turned off for a few weeks), I came across a cup (closed with a lid). Inside the cup was, to my olfactory horror, congealed milk, with a steel (iron) ...
3
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48 views

Calculating Fluoride in toothpaste

I need help calculating the concentration of fluoride in toothpaste. Thanks in advance. A linear regression line was obtained; $$\log(\ce{[NaF]})~(\mathrm{mol~L^{-1}})~ \mathrm{vs~EMF}: y = 59.8x ...
3
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1answer
35 views

Electroplating metal inside polymer foam with acetone

In my research we have a method of making polymer open-cell foams with high tortuosity and pore sizes on the order of 50–200 nanometers. I can make thicknesses of 100 µm to 2 mm thick (and up to 5 ...
3
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1answer
31 views

Reactions involved in Titanium Anodisation

I am writing up a lab report investigating titanium anodisation and producing oxide layers. After some searching, all I can find is the reaction $\ce{Ti + O2 \to TiO2}$, which I am having no trouble ...
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1answer
47 views

What is the standard potential of carbon?

What's the value of standard potential of carbon? The hydrogen and Carbon are in the electrochemical series despite being non metals hydrogen has zero potential difference what about carbon?
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1answer
26 views

How to write the last cell reaction for the following cell?

Consider the following electrochemical cell: $$\ce{Zn|Zn^{2+}}(0.1~\mathrm{M})||\ce{Zn^{2+}}(0.01~\mathrm{M})\ce{|Zn}$$ How should I write the overall cell reaction for this cell? I can identify the ...
3
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1answer
63 views

Electrochromic Materials, electrode setup

I've read a lot about electrochromism. This article on electrochromic materials has also been additionally helpful. I was wondering, for these electrochromic materials, can you simply attach a small ...
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1answer
84 views

Magnesium air-fuel cell or battery?

I'm a bit confused. I've got this "toy" ... with the help of this site I was abled to find out that the reaction stops with a lack of air. Link to the old question. The battery/fuel cell or however ...
3
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2answers
101 views

How do I setup the electrodes for cyclic voltammetry on a capacitor made on dry copper sheets?

I'm trying to measure capacitance of a cell I'm creating. It's composed of two copper-sheets with nano-material coated on one side, sandwiched with a membrane and wetted with $\ce{KOH}$. All of the ...
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1answer
53 views

Does phosphoric acid remove stainless steel electropolished layer?

Electropolished stainless steel has a high corrosion resistance due to the oxide film that is created during electropolishing. The film mainly consist of chromium(III) oxide. Phosphoric acid is ...
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1answer
70 views

How to identify which of two given electrodes with corresponding solutions is reducing more?

For the sake of the question, let’s assume that you are provided with two labelled rods of the pure metals $\ce{A}$ and $\ce{B}$ and two unlabelled bottles containing $1.0\ \mathrm{mol\ dm^{-3}}$ ...