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electrochemistry - Is Q in the Nernst equation [Reduction] [Oxidation . . . Note the ratio is the opposite way round red ox (If you write Q the opposite way up then there is a positive sign before the log) A derivation is given below for the Daniel cell: $$\ce{Zn(s) + Cu^{2+}(aq)-> Zn^{2+} (aq) + Cu(s)}$$
Positive or Negative Anode Cathode in Electrolytic Galvanic Cell \begin{align} \ce{Red -> Ox + e-} \end{align} takes place while the cathode is the electrode where the reduction reaction \begin{align} \ce{Ox + e- -> Red} \end{align} takes place That's how cathode and anode are defined Galvanic cell Now, in a galvanic cell the reaction proceeds without an external potential helping it along
How does the reaction of HCl and KMnO4 proceed? First, split your reaction into its half reactions Bring the "spectator ions" along for the ride and make sure they balance: Oxidation: 2 ClX− gets oxidized to ClX2 and gives up 2 electrons HX+ is your spectator ion 2HX+ +2ClX− ClX2 +2eX− +2HX+ Reduction: MnX7+ needs 5 electrons to reduce it to MnX2+ KX+ and OX2− are your spectator
electrochemistry - Does the order of a written redox couple matter . . . So we could speak of the redox couple consisting of Ag A g and Ag+ A g +; depending on whether a given redox couple is undergoing oxidation or reduction, we could then write a half equation involving the species given in the redox couple In my textbook, it is given as a convention that all redox couples are expressed in the form Ox Red
physical chemistry - Can we create a galvanic cell with only half a . . . In your question, the one Ox Red half might be the cathode In that case it will not have a potential at all since there is nothing but other electrons to balance the charge of the positive ions created at the cathode as the electrons leave it for the wire The ground connection acts only as a conductor of the electrons
How the Nernst equation is applied for electrodeposition? in which the $\ce{Red}$ part leaves the solution and has no concentration in the electrolyte How is the Nernst equation used to calculate the potential at different stages when the reaction proceeds?