Redox reaction Definition and 47 Threads

The conceptual reduction half-reaction that occurs with silver is $$\mathrm{Ag^+(aq)+e^-\rightarrow Ag(s)}$$ The book then immediately starts talking about balancing the chemical equation for a redox equation. They then jump right in with an algorithm for balancing complicated redox...

We used 14ml of a KMNO4 solution of 0.01 Normality, to find the Normality of a (COONa)2 solution. If we took 10ml of the (COONa)2 solution, what should its Normality be? I thought about using the following equation: N1V1=N2V2 Does the stoichiometry of the redox reaction affect the equation...

Hello, What are the oxidation-reduction reactions that are produced at the electrodes when they are considered inert (platinum or silver coated)? Let's take a simple example of a saline solution of KCl and apply a DC voltage between the two electrodes. Thank you in advance.

For the reaction between hydrogen peroxide and sodium hypochlorite, is the OCl- both reduced and oxidized? H2O2 + NaOCl -> NaCl + H2O + O2 Oxidation states: +1 -1 +1 -2 +1 +1 -1 +1 -2 0 From the oxidation...

I've written out the half reaction 8e- + 9H+ + SO42- = HS- + 4H2O and I know the logK = 4.25 (that's the constant mentioned in the prompt) I've written out the equilibrium statement of 10^4.25 = ([x^1/8]*[H2O^1/2])/([10x^1/8]*[e-]*[(10^-8.2)^9/8] However, from there, it seems like I have two...

FeS2+Na2O2->Na2FeO4+Na2SO4+Na2O Fe2+ --->Fe+6+4e- 2S-1 --->2S+6+14e- 2O- + 2e- ---> 2O The first two have a total of 18 electrons so In order to balance the electrons i should multiply by 9 the third semireaction (2O- + 2e- ---> 2O-2)x9 now this 9 is going to multiply the left hand in...

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...

Hi, In electro-chemical cells (galvanic, concentration, etc) or more generally when some RedOx reactions occur in solutes, is there always a phase change? I mean is there always a change in the state of matter from liquid to solid or gas?

Greetings, ME major here trying to brush the cobwebs off my chemistry. I can't seem to remember or recognize anything on my old chemistry textbooks regarding the optimization of a reaction. I question whether it was even taught. I'm trying to determine the most favorable conditions to ensure...

Quick note: Sorry for dominating the homework help board, guys! But, I wanted to say thank you to everyone who replies to my excessive questions. This forum's input has become integral to me as I am in a position now where I can't go to my teacher for help because of the logistics of commuting...

Homework Statement :[/B] 1.08g of ##NH_4 Cl## is boiled with 62ml ##\frac {N}{2}## ##NaOH## to expel ##NH_3## completely. 44ml of ##\frac {N}{4}## ##HCl## is required to neutralise the excess alkali. Calculate the percentage of ##NH_3 ## in ##NH_4 Cl##. Answer given: 31.5% Homework Equations...

What is the difference between valence factor and n-factor for oxidants and reductants? Take ##H_2O_2## as an example. What is the difference between the n-factor and valence factor for this compound? Also, how do I find the n-factor for any oxidant or reductant?

Hello, Firstly, I apolagize if this should go in "HW help". It isn't homework, and the question doesn't fit the format of "HW help", but it is so elementary, so I don't know. I'll write my questions in bold. Although I think I understand what redox reactions are--a reaction in which an...

Hi there: I'm trying to balance a reaction in which methane is oxidized by citric acid in solution. Both methane and citric acid will be transformed into carbon dioxide. To begin, I checked that the reaction is indeed a redox reaction. C6H8O7→CO2 So, I calculated the oxidation number for...

Homework Statement Complete and balance the following reaction: Cl2 + OH- → Cl- + ClO- Homework EquationsThe Attempt at a Solution So, I did it like any other redox: Cl2 + 2e- → 2Cl- 2Cl2 + 4OH- → 2ClO- + 2H2O + 2e- Net reaction: 3Cl2 + 4OH- → 2Cl- + 2ClO- + 2H2O However, the answer is Cl2...

Homework Statement Balance the following oxidation-reduction reactions: PbO2 = Pb 2+ + O2 Homework Equations [/B] These are the steps I'm supposed to follow. 1. Determine the valence number (charge) for all the elements involved in the reaction. 2. Determine the number of e- given off...

Homework Statement What number of electrons to balance the equation ##I_2(s)+OH^-(aq)\rightarrow IO_3^-(aq)+H_2O(l)## The Attempt at a Solution I see that the oxidation state of I increases from 0 to +5 But, I don't see any reduction at the reaction.. So, I don't understand how to balance the...

Homework Statement Determine the oxidizing agent, reducing agent, element oxidized, element reduced, # of electrons lost per atom, and # of electrons gained per atom. State if the reaction is not redox. 3FeCl2(aq) ------> 2FeCl3(aq) + Fe(s) Homework EquationsThe Attempt at a Solution...

Homework Statement How many milliliters of Cl2 gas, measured at 28.0 °C and 750 torr, are needed to react with 18.5 mL of 0.173 M NaI if the I- is oxidized to IO3- and the Cl2 is reduced to Cl-? Homework Equations The Attempt at a Solution So the molar mass is .0030906 mol NaI...

I was just wondering if anyone has some redox reaction formulas or corrosion formulas? Cheers Darryl

Homework Statement Can somebody help me balance this redox reaction using either the redox number method or the half equation method? Thank You Na2S + Ag + HNO3 + Na2CrO4 ----> Ag2S + Cr(NO3)3 + NaNO3 Can you please explain your steps. Thank YouHomework Equations The Attempt at a Solution I...

Homework Statement From 9th edition of Raymond Chang's Chemistry (Problem 4.108): "When 2.50 g of zinc strip were placed in a AgNO3 solution, silver metal formed on the surface of the strip. After some time had passed, the strip was removed from the solution, dried, and weighed. If the mass of...

I can balance this equation using the half reaction method, but I want to learn to use the oxidation number method with this particular question to "broaden my abilities". Homework Statement ICl → Cl- + IO3 + I2 The Attempt at a Solution I: +1 → +6: lost 5e- I: +1 → 0: gained 1e- (I'm...

Homework Statement Balance Cl2+NaOH -> NaCl + NaClO3 + H2O

Homework Statement CuCl2(aq)+Al(s)→AlCl3(aq)+Cu(s) Homework Equations The Attempt at a Solution I'm just not sure what to do with a situation involving compounds. I can do simple balancing without a problem. Here is my attempt. Please, please let me know where I went wrong...

I am supposed to balance the following reaction: CdS + HNO3 (dil) → Cd(NO3)2 + NO + S + H2O After writing out all the oxidation numbers for each atom, I found that Cd and N are both reduced (Cd5+ → Cd 1+ and N5+ → N2+). I am wondering how to approach this problem. Is it possible to have 2...

Redox reaction...with a twist! In the chlor-alkali process OH–(aq) and Cl2(g) are produced by the electrolysis of a saturated solution of sodium chloride. Explain why chlorine gas rather than oxygen gas forms at the anode. The solution to the question has the word "Overpotential" and I...

Homework Statement "State what you would infer from each of the following observations and suggest experiments you would carry out to test the validity of your inferences: When an unpleasant smelling gas was bubbled into an orange solution of a substance 'A', a solid was formed and the mixture...

Hi just wondering if you could help, I've stumbled across an example question where the iron purity is meant to be above 80% when 8H+ + 5Fe2+ + MnO4- → 5Fe3+ + Mn2+ + 4H2O 15cm3 is titrated and concentration of potassium permanganate used is 0.02M So far I have worked out Number...

Homework Statement Equation 1 - IO3- (aq) + 6 H+ (aq) + 5 I- (aq) -> 3 I2 (aq) + 3 H20 The iodine formed will react with the ascorbic acid. Equation 2 - C6H8O6 + I 2 -> C6H6O6 + 2 I- (aq) + 2 H+ (aq) The goal is to determine the ascorbic acid concentration (mg/mL) in a Vitamin C solution. A...

For a reaction where the electric potential is positive, does there need to be something to provide voltage for the reaction to occur? Let's say E= 1.34V for the reaction. Do I need to connect the electrode terminals to a battery to provide 1.34V?

Homework Statement Cr(OH)3(s) + ClO3−(aq) ® CrO42−(aq) + Cl−(aq) (basic) I am up the point where I need to balance both half-reactions for electron charge and I'm confused as to why this half reaction: ClO3− + 6H+ + 6e− ® Cl− + 3H2O, has a total of 6 electrons instead of...

Homework Statement Balance the following red-ox reaction that occurs in acidic solution. Homework Equations Pb(s) + PbO_{2}(s) + H_{2}SO_{4}(aq) \rightarrow PbSO_{4}(s) The Attempt at a Solution I did not see a change of oxo state from the sulfur, oxygen, or hydrogens. The lead...

Homework Statement In the lab, i saw that when Mg(s) attach with Fe(s) nail in a yellow solution( probably indicator), after one day, the brown substance and bubble are formed. My net ionic equation is SOA: O2(g) +2H2O(l) +4e -->4OH- SRA: Mg(s) --> Mg2+ +2e NIE: O2(g) +2H2O(l) +2Mg(s)-->4OH-...

Homework Statement Redox reaction: B-hydroxybutarate + 1/2O2 -> acetoacetate + H2O Half reaction 1: O2 + 4H+ + 4e- -> 2H2O (E = +0.816 V) Half reaction 2: acetoacetate + 2H+ + 2e- -> B-hydroxybutarate (E = -0.346 V) Using standard reduction potentials given, calculate ΔG calculate the...

Homework Statement 1. Explain why the following chemical reaction would not be effective to determine [Fe2+] in a given solution. Fe2+ (aq) + H2O2 (aq)-> Fe3+ (aq)+ H2O(l) | in acidic solution Homework Equations The Attempt at a Solution Hello: I am thinking that there may be a lack of...

H2SO4 (aq) + 2HI (aq) --> SO2 (g) + I2 (s) + 2H2O (l) Indicate the oxidizing and reducing agents. ----------------------------------------------------- I started by assigning oxidation numbers to all the atoms: H=+1 O=-2 S=+6 to +4 I=-2 to 0 I think H2SO4 is the reducing agent and...

Homework Statement Hydroxylammonium chloride reacts with Iron(III)chloride (FeCl3) in solution to produce Iron(II)Chloride, HCL, H2O, and a compound of nitrogen. It was found that 2.0 g of iron(III) chloride reacted in this way with 31 mL of 0.200 M hydroxylammonium chloride. Suggest a...

Homework Statement Give the net redox equations for the following reactions which occur in base solution. Fe(OH)_2+ O_2 \rightarrow Fe(OH)_3 Homework Equations noneThe Attempt at a Solution The oxidation half reaction is Fe(OH)_+OH^{-1}\rightarrow Fe(OH)_3 + e^{-}. How do we find the...

Help me please to finish this reaction of the ferrocyanide reduction: K3Fe(CN)6 + Na2S2O3 + H2O=...? the electron transfer reaction inthis case is 2Fe(CN)3-6 + 2S2O3 = 2Fe(CN)4-6 + S4O2-6. Wondering what are the final products of the upper reaction.

1. Oxalic acid, H2C2O4, reacts with dichromate ion, in acidic solution to produce carbon dioxide and chromium(III) ion. If exactly 50.0 mL of an oxalic acid solution is required to react completely with 25.0 mL of a 0.0100 M dichromate solution, what is the molarity of the oxalic acid...

Balancing a Redox Reaction.. urgent I have an assingment that is due tomorrow for my college chemistry class and i am stuck on the last problem. I need to balance the following redox reaction, but everytime i try it doesn't balance... H2O +I2 + OCl- ? IO3- + Cl- + H3O when i split it up...

Homework Statement Balance the following redox equation (in an acidic solution): Cu + NO3- -> NO2 + Cu2 The Attempt at a Solution I got 4H+ + 2NO3- + Cu -> Cu+2+ + 2NO2 + 2H2O But my book told me the same thing, but without the H2[/sub]O: 4H+ + 2NO3- + Cu ->...

Homework Statement Excess acidified potassium permanganate is added dropwise to an ammonium iron(II) sulfate solution. Write an overall redox equation for this process. 2. The attempt at a solution Well I am not really sure what to do. I don't know what products are being formed. What...

Hello, Today, we saw an experiment where an unknown yellow solution became dark blue while it was being shaken. I have an explanation for it, but would like your opinion as well: We had a redox reaction, with the oxidation of glucose (being the reducing agent) by NaOH (being the...

Just need some idea of where to start on this one...am in my first Chemistry class and it is an intensive so we're not spending a lot of time on things. This one just has me stumped from the beginning so just some guidance on where to begin would be a huge help... Problem: Gold metal will...

totally stuck! hey guys and girls, I'm having some serious problems with this redox reaction titration thing i just did! Basically i titrated a sodium thiosulphate solution with potasium iodate(v), sulphuric acid, potassium iodide and some starch. I've worked out the molarity of my sodium...