13 votes
Accepted

What happens to an ongoing electrolysis when you turn off the battery?

This is a very good question! I'm not sure why you received a downvote. What you are asking about is called a polarization current. Suppose we are electrolyzing a solution and suddenly we stop the ...
AChem's user avatar
  • 40.1k
6 votes

Do electrons really hang around the electrode while ions go take a swim?

We can expect one of three things to happen: The electrons also diffuse out from the electrode, becoming solvated electrons. If the electrons cannot diffuse, their negative charge creates an ...
Oscar Lanzi's user avatar
6 votes
Accepted

Ultraviolet Movie

In thin layer chromatography (TLC), plates coated with silica, or alumina often include such an inorganic fluorescent manganese doped zinc silicate dye which is activated by black light/UV light of $\...
Buttonwood's user avatar
  • 29.7k
5 votes
Accepted

Deriving Nernst Equation for a hydrogen-oxygen Fuel cell

Rather than pointing whether the assumptions are correct or incorrect, I will show you a general method to obtain the Nernst's equation for any system. It is a more systematic and formal approach, ...
Metal Storm's user avatar
  • 3,191
5 votes

Why is AgCl considered a good electrolyte? Isnt it sparingly soluble?

"Good electrolyte" is not explicitly defined term in electrochemistry. It is more probably used in context of electrochemistry related engineering in sense of degree of its applicability in ...
Poutnik's user avatar
  • 41.4k
3 votes

Fundamental understanding of electrode potentials

Consider an electrode immersed into an electrolyte, two things can occur. Metal ion $M^{n+}$ from the solution may collide with the electrode, gaining $n$ electrons from it, and convert to metal ...
wqeq's user avatar
  • 33
3 votes
Accepted

What exactly is the area used in the equation R=ρl/A to find the resistance of an electrolyte?

The formula above is applicable only at some specific conditions: The conducting medium is homogenous. The cross-section area A of a conductive medium must be constant along all the distance between ...
Poutnik's user avatar
  • 41.4k
3 votes

Do electrons really hang around the electrode while ions go take a swim?

If a zinc plate is dipped into pure water, maybe a small number of zinc atoms produce $\ce{Zn^{2+}}$ ions while the corresponding electrons are staying back in the metal. But this is only valid for ...
Maurice's user avatar
  • 28.3k
2 votes

Does electrode material affect efficiency of water electrolysis?

Nickel, which you're using, is reasonably efficient (in having low resistance and not building up an electrically resistant oxide layer). Monel alloy (Cu-Ni) also works well. BTW, alkaline electrolyte,...
DrMoishe Pippik's user avatar
2 votes

Does the electric field of a battery exist before a wire is connected outside?

Yes, there is an electric field around a disconnected cell -- an electrostatic field, just as if you ran a comb through your hair and p;laced it near an electroscope. In fact, one of the longest-...
DrMoishe Pippik's user avatar
2 votes

In electrochemisty, we write delta S= nF(dE/dT)p (at constant pressure), is (dE/dT)p cell constant?

The lecturer means "a" cell constant, not "the" cell constant in conductometry context. It is $\Delta_\mathrm{r} S$, not $S$. For a given temperature, it is constant only for ...
Poutnik's user avatar
  • 41.4k
1 vote

Electrolysis to refine metals

It is much easier to oxidate metallic copper than hydroxide or sulfate ions, what you can check yourself in a table of standard reduction potentials. Dissolving copper ions does not allow raising the ...
Poutnik's user avatar
  • 41.4k
1 vote

Electrolysis to refine metals

If a copper plate is dipped into a $\ce{CuSO4}$ solution, your process may occur. Some electrons may be creaated at the surface of the copper plate, which later on will interact with copper ion from ...
Maurice's user avatar
  • 28.3k
1 vote

Do electrons really hang around the electrode while ions go take a swim?

This a question that offers an answer with electrochemical equilibrium. Our experiment is as follows: We have a typical beaker of volume $V = \pu{200 mL}$ of water. On top of it we have a volume $V_\...
Metal Storm's user avatar
  • 3,191
1 vote

Removal of nickel plating on MgB2 without damaging the boride?

As you said you can use electrolysis to strip nickel. Use sulphuric acid diluted in distilled water with concentration of 10-20 % as electrolyte. Submerge the nickel-plated MgB2 after attaching it to ...
Anjankumar's user avatar

Only top scored, non community-wiki answers of a minimum length are eligible