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Results tagged with electrochemistry
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user 104835
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).
1
vote
Methanol fuel cell anode - why not oxygen instead of water?
The student is supposed to use the chemical principles they've learned and come up with reasonable answers. A [redox, really any] reaction separated into its oxidation and and reduction moieties can …
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0
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Why is the standard electrode potential positive for half cells that are easily reduced?
Blame Ben Franklin or physicists for not knowing what + and - are and having terms like current flow! We chemists know better and think only of electrons altho we do lapse into positive ion flow in Li …
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6
votes
Electrolysis with salt water on steel plates creates horrible black liquid
It is probably a mix of Fe++, Ni++ and Cr+3 oxides and hydroxides. This is a common trick by RO system salespeople to convince people how terrible their water is. They electrolyze a nail, the more ion …
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0
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Conducting current in electrolytes
Matter is ENERGY, the lowest states of energy. Each stable compound, particle, atom, ion, is in its own relative energy minimum surrounded by relative maxima of activation energies. These activation e …
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0
votes
Can Sodium atom (Na not Na+) be considered a free radical?
Na atoms can be considered a radical but only in a context where they are stable. Possible situations are the gas phase, mercury amalgams, some metallic solutions, electrode reactions that do not invo …
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0
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How can reduction and oxidation occur separately in batteries if they're meant to be one rea...
A balanced chemical or physical process requires conservation of Mass-Energy and Momentum. The balanced chemical equation must demonstrate that. The chemical equation is a STATE FUNCTION; it does not …
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1
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Are electrodes in an electrolysis unique for every electrolyte or can any random electrode b...
Any electrode will oxidize if the potential is high enough and there is nothing present that is more easily oxidized or, if given enough time, potentials are close and conditions right. We had platinu …
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1
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Solubility product of a sparingly soluble salt in presence of other dissolved salts
This is another example of everything you learned in HS, then in College, and then in Grad School; is wrong! Unfortunately or fortunately even after one does research there is still more to learn or u …
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2
votes
Why is silver cyanide used for electroplating
The problem with electroplating the more noble metals such as copper, silver and gold is that these metals will react with the substrate [cathode] with a competitive immersion plating reaction. This c …
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0
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Accepted
In a voltaic cell with standard hydrogen electrode is the measure half cell always the cathode?
In aqueous solution the potential of the standard hydrogen electrode is defined as 0. volts. The standard conditions are: all activities, fugacities, molarities equal to one [1.]. By DEFINITION in a c …
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1
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Why would my pH meter have changed its voltage setpoints?
The voltage measured is the potential difference between the glass electrode and the reference electrode. This depends on the construction of both and is set to zero by the calibration control of the …
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0
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How to deduct the concentration of chloride in a silver/silver chloride electrode, given the...
The cell description is somewhat vague and leaves much to the imagination; it indicates a liquid junction to a solid-state reaction. The Ag-AgCl electrode is reversible to the chloride ion. Its typica …
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Deriving reduction potential from redox reactions
The electrode potential measures the energy change involving the transfer of one mole of electrons. The potential for Hg[II] to Hg[I] is one mole transferred; the potential for Hg[I] to Hg[0] is a sec …
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0
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How does a silver chloride electrode (Ag/AgCl) convert the potential in aqueous solution to ...
It all comes down to attractions of electrons to various nuclei. In the case of electrodes there must be intimate mixing of all components so that the transfer of electrons is kinetically facile. It t …
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1
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What endothermic reactions can be effectively reversed by electrolysis?
Any elemental, i.e. single step, reaction and many more complicated reactions that can reach equilibrium, can be reversed. The forward and reverse reactions in an equilibrium situation follow the same …
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