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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148 views

Is water acidic enough for an redox reaction involving H+?

If you stored $\ce{Pb(NO3)2(aq)}$ in a $\ce{Cu(s)}$ container, would any reaction occur? Lead(II) ions will not react spontaneously with the copper solid as the $E^0_\mathrm{net}$ of the reaction ...
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18 views

Can't a redox reaction occur in one half cell alone without flowing through the external circuit?

Say you have two half cells. The electrolytes are connected by a salt bridge and the electrodes by a wire. Half cell 1’s electrolyte is copper(II) nitrate and its electrode is solide copper. Half ...
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0answers
9 views

Materials required for making anode and cathode in electrolytic cell [closed]

I want to know the material used for making anode and cathode.
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0answers
23 views

Electrochemistry class 12 [closed]

In the electrolysis of SnCl2 solution, 4.48 L of Chlorine is liberated at STP. Find the mass of Tin deposited at Cathode. I know how to solvequestion when current is given and we are suppposed to ...
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0answers
9 views

Does ion exchange take place inside the salt bridge? [closed]

Is there any phenomenon that takes place in the salt bridge if yes please explain about it?
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0answers
8 views

Electrochemistry - salt bridge [closed]

If we use a salt bridge do the contents present in both the cells change?
2
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1answer
44 views

Circuit theory paradox - Unexpected results [closed]

I recently studied capacitors and found out that there is something called 'ideal circuit paradox'. Searching Google I found that one can cannot find the potential difference between two points in a ...
0
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0answers
22 views

What is wrong with this zinc electroplating experiment?

I have a problem that I’d please please request assistance on. In the electrolysis experiment of zinc electrode connected as the anode (positive terminal) and an iron nail connected as the cathode (...
0
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0answers
20 views

Conductivity and normality

For $\ce{HCl}$ solution at $298\ \mathrm K$ the equivalent conductivity at infinite dilution is $425\ \mathrm{\Omega^{-1}\ cm^2\ eq^{-1}}$. The specific conductance of solution of $\ce{HCl}$ is $3.825\...
3
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1answer
34 views

What are polydisulfide polymers?

What are polydisulfide polymers? How are these polymers applicable in energy sectors such as rechargeable batteries?
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1answer
29 views

Nernst equation: half cell vs overall reaction

Can the Nernst equation always be applied to the overall redox reaction as opposed to only half cell reactions? For example, in the following silver-silver chloride electrode: $$\ce{Ag (s)|AgCl (s)|...
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2answers
48 views

The reaction of copper(II) oxide and magnesium

Write an ionic equation for the reaction $$\ce{CuO + Mg -> Cu + MgO}$$ I know this a displacement reaction and I think the answer should be $$\ce{Cu + Mg^2+ -> Cu^2+ + Mg}$$ However, the ...
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1answer
56 views

Why are non-spontaneous reactions driven in the presence of energy?

Here is my understanding. If you have an endergonic reaction (m) with $\Delta G_m=-m$ and you couple it to an exergonic reaction (n) with $\Delta G_n=n$, where $n>m$, then the endergonic reaction ...
4
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1answer
26 views

Calculating Ratio of Stability Constants

Solution I contains a mixture of $\ce{FeCl2}$ and $\ce{FeCl3}$, and solution II contains a mixture of $\ce{K4Fe(CN)6}$ and $\ce{K3Fe(CN)6}$. The concentrations of iron-containing species satisfy the ...
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0answers
16 views

Reverse single replacement reaction

Is it possible using electrochemistry or some other method to reverse a typical single replacement reaction to go in the opposite direction. For example, is it possible to take silver metal and ...
-1
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1answer
55 views

Immersing copper and zinc in hydrochloric acid

I am wondering what would happen if a metal strip of copper and a metal strip of zinc were immersed in solution of $\ce{HCl}$ in standard electrochemical conditions. I have calculated the standard ...
0
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2answers
47 views

Building a Voltaic Cell Without Metal Ions

For an assignment in my Chemistry class we have to build a voltaic cell using materials that are provided to us and that outputs a voltage as close to 0.8v as possible. The list of materials is as ...
4
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2answers
132 views

Can silver metal be used to electrochemically reduce copper?

I have a solution of copper(II) ions and several cations. I am trying to reduce the copper ions to copper metal with electricity. My Ideas was to use silver as the anode and a copper wire as the ...
0
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1answer
21 views

Does conductivity change in a solution due to rust?

I plan on conducting an experiment in which I place an iron nail in water and analyze its rate of corrosion into rust with different concentrations of NaCl. My original plan was to cover the water in ...
0
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0answers
17 views

HGB and Blood detection principle

I have seen hematology instruments (ie. blood cell counter), where absorbance principle is used for HGB (hemoglobin) measurement where as Impedance measurement technique using electrodes is used for ...
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0answers
28 views

Electrolysis of organic salt [duplicate]

Is this equation of electrolysis right? $$\ce{2Na2C4H4O6 → 4Na + C4H4 + 4CO2↑ + 2O2↑ + 2H2↑}$$
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0answers
19 views

Why don't we equate ΔH or some other thermodynamic quantity with -nFE and instead use ΔG?

I was studying electrochemistry, and the very first equation that I came across was this, with no proof. $$\Delta G = -nFE$$The only explanation that was given was that the change in Gibb's free ...
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0answers
18 views

Is Ag/AgCl ink a colloid of Ag particles in aqueous AgCl solution?

Will it work as an electrode even if the the ink dries and the AgCl crystallizes?
0
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1answer
30 views

Choose electrolyte for electroplating

I am planning to try electroplating a steel ring with copper, than nickel, and than finally gold. It seems to me that this would be as simple as using a bath of HCl for electrolytes and attaching the ...
0
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1answer
13 views

Does the rate of ion movment in a salt bridge affect the total voltage produced by a voltaic (Galvanic) Cell?

I was thinking that different salts used in a salt bridge in a voltaic cell may have different rates of flow (perhaps ionic radius or some other property effects the rate?) I was wondering, if some ...
0
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1answer
32 views

Electrolysis and reduction potentials [closed]

Why does the hydrogen gets reduced at the cathode and not $\ce{Na}$ when aqueous solution of brine is subjected to electrolysis? My book says because discharge potential of hydrogen is lower than ...
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0answers
16 views

Equilibrium potential example

Hi guys, just wondering if there is a mistake my lecturer made with this example she gave in one of her lectures, according to the Nernst equation, the oxidised species should be at the top and the ...
3
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1answer
43 views

Efficient oxidation of KCl to KClO3

I am trying to convert $\ce{KCl}$ to $\ce{KClO3}$ through an efficient process. I realize that I could electrolyze a solution of $\ce{KCl}$ to obtain some $\ce{KClO3}$ as a precipitate, however this ...
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0answers
20 views

When measuring the concentration of a solution using wheatstone bridge, why is AC used instead of DC? [closed]

I can't quite wrap my head around this after reading it in my high school textbook. How exactly does DC change the concentration of the solution (or what does it change really?) and how does AC come ...
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0answers
21 views

Efficiency of Electrochlorination

When using electricity to create sodium hypochlorite from a solution of water and dissolved Sodium Chloride. I see in most instances that a fairly concentrated solution of brine (10% or more) yields ...
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0answers
34 views

NaCl Electrolysis - Dilute vs Concentrated - Nernst Equilibrium

Interested to know if there is a critical concentration at which $\textrm{Cl}^{-}$ will oxidise over H$_2$O and if this can be determined using the Nernst equation. That is, obviously if $[\textrm{Cl}...
0
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0answers
10 views

Does the ionic radius of an ion affect its rate of flow in an electrolye?

Do Ions of different Ionic Radius' have different speeds or rates of flow in an electrolyte and thus produce differences in currents? If so, would ions with smaller Ionic radius' move faster or slower?...
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1answer
55 views

Cheap metal to replace platinum in hydrogen fuel cell

Platinum is used as a catalyst in hydrogen fuel cells because it increases the efficiency. However, if I just want to make a fuel cell for demonstration purposes, I don't want to use a lot of money to ...
3
votes
1answer
53 views

How would using Different Salts in a Salt Bridge Effect the Voltage Generated by Voltaic Cell?

If I use a range of different nitrate solutions (e.g. calcium nitrate, iron nitrate) for the salt bridge in a voltaic cell, what effect would it have on the flow of ions in the Voltaic cells? Will ...
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votes
1answer
39 views

Why water is not used in Electrochemistry [closed]

In electro-chemistry, we always use Metal and Metal ion electrolyte. My question is 1. why Water is not used as electrolyte. (because books only refer to Metal/Metal ion type electrods, they dont use ...
0
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0answers
11 views

Anodic chromic oxidation…cathodes material?

Speaking about the anodic chromic oxidation of aluminum and aluminum alloys, can anyone tell me what kind of material is better between stainless steel and ultrapure iron, for cathodes construction? ...
0
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0answers
6 views

Which is a better way to calculate E-cell [duplicate]

Suppose we have these two half cell reactions. In order to calculate E(Cu_+1/Cu), what is a viable way to do it. I looked up resources on when to simply reverse one equation and add/subtract the ...
1
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0answers
25 views

Why does copper and zinc connected by a wire in 6.0M NaOH become a galvanic cell?

For an experiment I placed two electrodes of copper and zinc connected by a wire in 6.0M NaOH. According to standard reduction potentials, there should be no reaction; however, the copper becomes ...
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0answers
18 views

Will the mass of a solution of copper sulfate and silver nitrate remain constant when electrolyzed?

Aqueous copper sulphate and aqueous silver nitrate are electrolyzed by 1 ampere current for 10 min in separate electrolytic cells. Will the mass of the copper and silver deposited on the cathode be ...
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0answers
21 views

Electrolysis with copper foil: There are plenty of spot

Currently experiencing electrolysis with copper foil instead of copper wire. I bought the copper foil from the ebay stating that this is 99.95% purity copper foil. This is just asking for some comment ...
2
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0answers
25 views

In a galvanic cell where the two electrodes are in the same electrolyte solution, why do reduction and oxidation occur separately?

In a certain book, I was presented with the following solution: An iron nail is attached by a piece of wire to a magnesium ribbon, and the iron and magnesium are placed into the same container, with ...
0
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1answer
22 views

Electrode Potential at Equilibrium

Above is an excerpt from my book. It says that at equilibrium the potential difference develops between electrode and eletrolyte and it is electrode potential. But at equlibrium, should not the ...
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0answers
16 views

Electrochemistry, galvanization

In my textbook there is a question says: How to express the reaction of the process of galvanization of iron with zinc? The choices: $$\ce{Zn -> Zn^2+ + 2e-}$$ or $$\ce{Fe^2+ + 2e- -> Fe}$$ I ...
0
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1answer
30 views

Charge, Size, and Movement in Aqeuous Ions as Electrolytes

Would a pair of aqueous $+2$ and $-2$ ions necessarily conduct electricity better than the same concentration of $+1$ and $-1$ ions? Furthermore, would more massive ions not conduct as well as less ...
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1answer
52 views

Volcano plots: How is the data fitted?

When studying about catalysts I normally come accross volcano plots like the one shown below: What confuses me is how are the two lines fitted, how do you determine what points to include and what ...
1
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1answer
28 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 ...
1
vote
1answer
98 views

What will be the reaction between tin (II) chloride and copper (II) chloride?

I just tried conducting an experiment during lunch today. Now, I calculated this reaction 4 days ago dealing with electrochemistry, $$\ce{SnCl2 + CuCl2 -> Cu(s) + SnCl4}$$ Theoretically, I got ...
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0answers
23 views

The potential range of the cyclic voltammetry of CoCat in KPi made of D2O

I have a phosphate buffer adjusted to pH 7, and another phosphate buffer made of deuterium oxide (D2O) adjusted to pH 6.6 (pD 7). I want to conduct cyclic voltammetry of cobalt oxide catalyst in these ...