Electrochemical cell Definition and 33 Threads

This is the final problem in this problem set from MIT OCW. Here is what I did to try to solve it The table cited in the problem is below We can easily spot the two redox couples that are in the electrochemical cell we are given. The hydrogen-based electrode has standard potential zero, and...

This problem is from this problem set from MIT OCW. Here is how I tried to solve the problem. Looking at the table above, we see that the top-to-bottom order is from largest to smallest standard cell potential. Since gold, ie Au, is at the top, every other redox couple on the list has the...

From the molar mass of tungsten of 183.84 g/mol, we know that ##100/183.84\approx 0.55## mol was deposited. We also know how many mols of electrons passed through the solution in an hour. This comes out to about 1.12 mol of electrons. So, at a very superficial level of understanding, I...

Item (a) of problem 1 of a chapter on "Galvanic Cells" asks us to calculate the Standard Gibbs free energy for this cell reaction. I can do the calculation, but I am frustrated by the following. The entire chapter focused on the electrochemical cell...

The notes from MIT OCW I am reading contain the following ##E^\circ## denotes a standard electrode (aka redox) potential. Therefore, the quote above says that a positive ##E^\circ## means that relative to a standard hydrogen electrode, the electrode in question operates as a cathode, and the...

Homework Statement: If we touch a metal spoon on the anode of high voltage battery. Then what charges will accumulate on the spoon, positive or negative? Relevant Equations: No such a equation I think, negative charges because electrode equilibrium in the anode says some electrones acculilate...

I was watching this video that I found on Youtube. My question is, does type of electrolyte affect the voltage reading, since it dictates which redox reactions are possible? (here, Na2SO4 instread of CuSO4) Consider a Mg|Cu electrode pair in a galvanic cell; the reaction is, usually in...

Voltmeter is an instrument which measures electric potential difference between two points. When measuring electrode potential of some redox system (vs SHE for example), it is said that voltmeter reading contains sum of all potential differences present in a cell. This includes all...

If we look at system at constant temperature and volume which is galvanic cell, first law of thermodynamics states: $$ dU = dQ + dW' $$ Where W' is electrical work done by galvanic cell and Q is heat exchanged with surroundings. As far as I know electrical work is work done by electric field...

I did an electrolysis experiment with 1.6M Barium Chloride solution and the electrolyte turned black after the electrolysis. I am fairly positive that Chlorine was produced at the anode from the smell. However, Ba(OH)2 is colorless. I used graphite electrodes for this experiment. Does anyone...

Hi, googling for Voltaic cell I found this video about it. At minute 2:35 to 2:54 you can see that, without any electrical conductor connected between electrodes, in the Copper half-cell the metal electrode (Cathode) gets an amount of negative charges (electrons). Basically what described there...

.

Hello, consider again a simple Daniell cell with salt bridge in place but no external electric connection between electrodes. Reading from some source e.g. link1 it seems upon Zinc and Copper metal rods are dipped into their own ions solution, both will gain a negative charge (-) due to an...

Hi, having not a deep knowledge of electrochemistry I've some doubts about processes involved in a galvanic cell. Take for instance a Zn/Cu Daniell cell for which E0cell is 1,10V. That means emf for it is 1,10V. Starting to read from how battery works I had a first understanding of how...

Hi, Could someone please explain to me some terminology. Is a potentiostat considered a "power source" for an electrochemical cell (the cell is for the CO2 reduction reaction). An example of this type of cell can be seen here...

Ecell = E0cell - (RT/nF)lnQ So I understand the Nernst Equation, but I don't have some info. (Please bare with me, I'm in secondary) I'm doing a Cu - Al cell. My E cell is negative (-1.33). Does this have an affect on the equation? What exactly does E0 stand for? I understand how to find E...

< Mentor Note -- thread moved to HH from the technical chemistryforum, so no HH Template is shown >[/color] I was given this problem: A voltaic sell uses the reaction 4Fe3+ + H2 --> 2Fe2+ +2H+. Find the cell potential when [Fe3+]=1.50 M, PH2=.50 atm, and [Fe2+]=.00100 M and the pH of both anode...

In our textbook it is written that -voltmeter measures the electrode potential difference between 2 half cells (in an electrochemical cell) (electrode potential refers to the potential difference between electrode and its salt solution in which it is dipped) it should come-voltmeter measures...

I'm wondering about the importance of the electrolytic solution in an electrochemical cell. For example, we have Zn/ZnSO4 and Cu/CuSO4. According to the electrochemical series, Zn will reduce Cu, and we will have a reaction. Zn(s) -> Zn2+(aq), Cu2+(aq) -> Cu(s). So there MUST be Cu2+ in the...

Hi, Please don't be spooked by the long post, it's just that it contains two problems (I beg your pardon if I shouldn't have put both in one post, I just figured it'll be better than creating two posts...). I can't figure how to solve these, so if you please could please help me with...

Farady's law are derived for electrolysis. My question is the same rule can be applied in the analysis of electrochemical cell? I think those two cell (electrolytic and electrochemical) are just opposite functional to each other.

So, here is my question we know about an electrochemical cell in which when zink rod and copper rod are dipped in there respective solutions the electron flow from zink rod to cu ... but what makes those electron to flow ... here comes the answer the potential difference did that ... please...

The potential at which a metal is deposited in the electrowinning process can significantly affect the quality of the deposit. The potential itself can be dramatically affected by the addition of complexing agents and by adjusting the pH of the solution as the following calculations demonstrate...

How does concentration of solution (So42) affect the voltage in a electro-chemical cell?

hi i was wondering if somebody of you knows something about this stuff? it is about an electrochemical cell that is made of zinc and copper in sulfuric acid. now the reaction is: Zn-> Zn(2+)+2e- 2H+ + 2e- ->H2 my problem is, that i do not know whether this...

I built a cell with one side containing the solution 0.10 M CuSO4 with Cu(s) in it. The other side has 1 M NH3 and 0.05 M ZnSO4 with Zn(s) in it. The measured cell potential was 1.31. I am using the Nernst equation. I need to find the concentration of Zn^2+. E=E"-(0.059/2)logQ 1.31 =...

Homework Statement let's say we have an electrochemical cell composed of 2 cups each cup contain a metal and the ions of that metal and an acidic componment like H2so4 the two cups arent attached with any kind of conductor if we try to measure the voltage with a voltmeter would it detect...

Homework Statement A 75.0-W light bulb is powered by connecting it to a standard 12.0 V auto lead-storage battery. How much energy (J) is required to keep the bulb burning for 50.0 continuous minutes ? Assume 100 percent efficency.Homework Equations 1 watt = 1 J/s 1 J = 1 C x 1 V The Attempt...

You are given the following materials:  Silver wire  A 0.10 mol L-1 solution of cadmium nitrate  Cadmium wire  A 0.10 mol L-1 solution of silver nitrate  A salt bridge  Copper wire  Beakers and other glassware as required Draw a labelled sketch of your cell. Describe...

Describe an electrochemical cell that would determine the solubility product constant at equilibrium for cupric hydroxide and calculate it. I'm totally lost on this one, any help is greatly appreciated.

For an electrochemical cell containing two metals how do I figure out which one reduces and which one oxidizes using standard reduction potentials? Thank you very much for the help.

Hello everyone. I am having trouble with a question on electrochemical cells. I have to find the balanced REDOX reaction of the cell. All I am given is a diagram with the following information 1. Aluminum electrode submerged in 1 mol/L Aluminum Nitrate Al(NO3)3(aq) 2. Nickel electrode...

I have a problem that in my physics textbook, a source of EMF is just shown as a box having + and - terminals. The inner workings of that box need not be considered. They claim that although there is obviously an electrostatic force Fe due to this separation of charge, it is countered by a force...