# Tag Info

Accepted

### Can electrodes be made from mercury?

The dropping mercury electrode (DME) is a working electrode made of mercury and used in polarography. Experiments run with mercury electrodes are referred to as forms of polarography even if the ...
Accepted

### How can I identify whether a substance is KOH or NaOH?

A flame test should tell you pretty quickly. Make a small wire loop (preferably steel or nichrome), heat in a bunsen burner or propane torch flame until red hot and all the contaminants are burned off,...
• 9,036

### Why do positive ions go to the cathode?

TL;DR The cathode in an electrolytic process is considered to be negative, so there is actually no contradiction. The cathode is a positive electrode in a galvanic cell. There are different notations ...
• 35.8k

### Why is twice as much hydrogen produced than chlorine in the electrolysis of brine?

It appears, as the others have said that the same number of moles of gas of chlorine and hydrogen is produced. Then why are there different levels of solution? Since the solution is taken out in the ...

### How to control current and voltage in electrolysis

You can't control both voltage and current electrically: Your power supply will hold one or the other constant, but the properties of the electrolytic cell will then determine the other one. So you ...
• 534

• 21.6k

### Why do we do electrolysis and electroplating using warm electrolyte?

ringo makes good points in his answer. Additionally, though, the increased temperature enhances mass transfer of ions to/from the electrode surfaces by at least two mechanisms: Higher temperature ...
• 16.9k
Accepted

### Voltage needed for electrolysis of water

I'm assuming you mean this Wikipedia article on the hydrolysis of water in which the method of determining that potential difference is described farther down the page. I'll address your other ...
• 41.7k

### Which electrodes do not corrode at all?

you do not need to solder a graphite electrode to connect it. It is possible to connect mechanically (screws, wires etc.). It is possible to buy some bigger pieces here: Penta trading To answer your ...
• 2,135

### Reduce chlorine gas

The issue is that oxidation of chloride to chlorine has a lower overpotential than oxidation of water to oxygen. You will always have to have an oxidation reaction going on while reducing water to ...
• 41.7k
Accepted

### While electrolyzing concentrated aqueous sodium chloride, why is it that chlorine is discharged but not sodium?

Let's take a look at a table of standard electrode potentials and find the relevant half-reactions: Reductions (there is also a half-reaction for water reduction that doesn't involve a proton at -0....
• 12.6k

### Creating ethane through electrolysis of vinegar

Indeed that is quite possible. The reaction was first described by Hermann Kolbe and is hence called "Kolbe's Electrolysis" It is a decarboxylative dimerisation of two carboxylate ions (carboxylate ...
• 8,327

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