Redox Definition and 204 Threads

Homework Statement A student weighs by difference 0.1956 g of sodium oxalate into a 100 ml Volumetric flask and dilutes to the mark 10 ml of HCl and 90 ml of distilled water. Approximately how many ml's of 0.02 M KMnO4 would be required to reach the equivalence point of the titration...

I'm wondering about the importance of the electrolytic solution in an electrochemical cell. For example, we have Zn/ZnSO4 and Cu/CuSO4. According to the electrochemical series, Zn will reduce Cu, and we will have a reaction. Zn(s) -> Zn2+(aq), Cu2+(aq) -> Cu(s). So there MUST be Cu2+ in the...

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...

Homework Statement Which of the following does not spontaneously reduce 1 M hydronium ion? Homework Equations Spontaneous reduction: + E-zero value. The Attempt at a Solution The answer is 1 M NaOH. However, sodium is a very strong reducer. Why doesn't this reaction go...

1) Problem Statement 2) Relevant Equations3) Attempt at Solution For question d, I realize in this case that the substance that is oxidized and reduced is the same molecule : iodine. How do I proceed then as the next step would ask for you to find the change in oxidation numbers and multiplying...

The partial pressures of O2 and H2 in the atmosphere above water are typically very low indeed, so why is it we don't see the equilibria 2 H2O = O2 (g) + 4H+ + 4e- and 2 H+ + 2e- = H2 (g) occurring whenever we have a beaker of water (if this was observed then the H+ concentration would be...

I understand the concept of balancing chemical equations but in the case of redox reactions I don't understand the physical meaning of balancing in acid medium and balancing in Basic medium. Sure, I know how to balance the equation but I want to know what it means physically. Why do we need to...

Hi all, I'm learning how to solve redox equations. I found the algebraic method to solve equations such as this one: Fe^{2+} + Cr_{2}O_{7}^{2-} +H^{+}\rightarrow Fe^{3+} + Cr^{3+} + H_{2}0 and i was able to solve it. What I don't see is how to use that algebraic method to solve an...

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

does a reaction involving transfer of an electron between atoms with slight difference in electronegativity still count as a redox reaction?

When balancing oxidation reduction reactions involving acids or bases, what (in the case of acids) allows you to add H+ ions to one side of the reaction and H2O to the other, or in the case of bases, OH- and H2O to balance out hydrogen/oxgen? Normally you are not allowed to just add random...

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...

What is the relation between Electrode Potentials and Redox reactions ? Can we determine the relative strength of reduction of a metal by looking just at the electrode potentials ? Here is a particular thing that confuses me : We know that the standard electrode potential of Lithium is...

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...

Homework Statement This is my equation. I needed to balance it in an acidic solution. H2O2(aq)---->H2O(l) Homework Equations I know that you should balance oxygen using H2O & hydrogen using H+. I am confused on how you balance the ionic charges. The Attempt at a Solution...

Hey, I'm having trouble understanding the trends of the oxidation states for the first row of the transition metals -my prof said that Cu is the only metal that forms a stable +1 oxidation state. But, I've done a question in hmwrk that had Cu+1 as unstable with respect to disproportionation how...

I'm not really sure exactly if I'm doing these correctly but what stopped was the choice of adding 6 electrons to the left side.. This is what I did: This is their answer: I'm doing something wrong and I don't know why my answer is so different then theirs.

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...

Question Cr2O72- + H2O2 → Cr3+ + O2 Attempt Cr2O72- + 3H2O2 + 8H+ → 2Cr3+ + 3O2 + 7H2O Is my attempt correct. I think I had lost my grip in redox balancing.

Homework Statement C2H5OH(aq) + I3-(aq) → I-(aq) + CO2(g) + CHO2-(aq) + CHI3(aq) Homework Equations The Attempt at a Solution I am stuck on how to get C to combine with I in CHI3. Thanks.

Good day! I would just like to confirm a couple things in regards to my solution for this problem. Problem: A sample of hydrated ethanedioic acid crystals (formula H2C2O4 . 2H2O) of mass 0.2145g was dissolved in water and the solution was used to standardise some potassium permanganate...

Question Balance the following redox using oxidation number. Please show all steps. NaIO3 + NaI + HCl -> NaCl + I2 + H2O Attempted Solution So first I assigned oxidation number: NaIO3 + NaI + HCl -> NaCl + I2 + H2O 1+ 5+ 2- | 1+ 1- | 1+ 1- | 1+ 1- | 0 | 1+ 2-...

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

Homework Statement What are the half reactions of Fe + CuSO4→ Cu + FeSO4 Homework Equations The Attempt at a Solution i think it is Fe→Fe2++ 2e- and Cu2++2e-→ Cu I don't know where the SO4 comes in. is it a spectator ion

Redox and the product "Asea" Has anyone else ever heard of this stuff? I notice from the video that they claim to be "very scientifically backed," according to the homeopathic Dr.. Does anyone have any Scientific Data or insight regarding this product, or or the "Redox" on which it depends?

What is the equation I should be using for the following question: At 298K a cell reaction has a standard emf of +0.17V. The equilibrium constant for the cell reaction is 5.5 X 10^5. What is the value of n for the cell reaction. Grateful for anyone's help!

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...

Hi guys I'm studying about general chemistry in a physics class. I've some exercices that I'm unable to solve, stuff like this:Copper can be solubilizated in water, oxidating in Cu++ form, reacting with HCrO4- in an acid environment realized by H2SO4. Write down the balanced reaction.my problem...

Redox Titrations Bleach! help! Homework Statement An unknown metal hypochlorite salt, M(ClO)2, is subjected to analysis by iodometric titration: the salt is dissolved in dilute sulfuric acid, treated with excess aqueous KI, and then titrated with Na2S2O3 in the same manner as your experiment...

I know this is going to be a very simple question to ask so I hope to not bore anyone. I am having trouble with redox reactions. Not so much in completing them but in understanding them. The problem that I have is telling when something is reduced or oxidized. I know if it gains electrons...

I have some questions concerning the tendency of a system containing two different metals and water to corrode. This is coming from several similar discussions on another forum, concerning water cooling of computer components. There seems to be a lot of repeated dogma, which may include...

Hi there, I am trying to get the Eh (or pe) of water samples which I took last summer. I didn't measure it directly at the time. I do have dissolved oxygen values from each site. Is there a way to convert dO2 into Eh? All the dO2 values were in the 80-100% range. Alternatively, is...

For example, on this website http://www.chemguide.co.uk/physical/redoxeqia/combinations.html in the second diagram from the top, it shows that *if a high resistance voltmeter is placed between two pieces of metal, zinc and copper, the zinc metal will accumulate a build up of electrons.* Then...

a. CH4(g) + 2O2(g) ----------> CO2(g) + 2H2O(g) I need to determine which is reduced and which is oxidized, I already know that C in methane is Oxidized. O2 is reduced but how can you determine that?? I know it has to do with electron transfer but I just don't see it

Homework Statement I am having trouble trying to find out if things react with each other or not. I don't really know how to read the reactivity series well :confused: Homework Equations Question 1: a student was given a beaker of an unknown ionic solution to identify. she conducted the...

Homework Statement Balance PbO2(s) + Cl(-) → PbCl2(s) + O2(g) Homework Equations n/a The Attempt at a Solution Pb(4+) + 2e(-) → Pb(2+) and I'm stuck because there's no 2nd reaction.

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...

We are working on some design ideas to hopefully eventually get our shop and home off the grid with independent power. We are in one of the best locations for wind generation but energy storage becomes an issue and a grid tie system is simply impractical and will not obtain our goals. the...

Hi guys, A few days ago we conducted a wine redox back titration in my chemistry class, and my teacher has asked us to calculate to answer all of the questions on a sheet she gave us. Attached is this sheet, outlining the method we followed, the materials used and all the questions she wants...

Just need some clarification as to whether or not I'm doing this right. 1 drop HCl and several drops KMnO4 added to 2mL NaHSO3. HSO3- → HSO4- + 2e- MnO42- + 4e- → MnO22- 2HSO3-(aq) + MnO42-(aq) → 2HSO4-(aq) + MnO22-(aq) A few questions: -Since NaHSO3 is not an acid, the hydrogen atom...

Homework Statement Use half reactions to balance the following redox reactions and underline the oxidizing agent m) Zn + HNO[SIZE="1"]3 --------> Zn(NO[SIZE="1"]3)[SIZE="1"]2 + NH[SIZE="1"]4NO[SIZE="1"]3 + H[SIZE="1"]2OHomework Equations Not applicableThe Attempt at a Solution I would usually...

Homework Statement Use half reactions to balance the following redox reactions and underline the oxidizing agent. a) Cl2 + ClO3{-} -> ClO{-} (acidic) {} is the charge e{-} is electrons Homework Equations Not applicable The Attempt at a Solution Well I tried to separate and...

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...

Homework Statement H_{2} + O_{2} \rightarrow H_{2}O Homework Equations The Attempt at a Solution Well, my classmates insist that H= +1 and O= -2 (in the products side) so, my Hydrogen will be my Reducing agent because it underwent Oxidation and my Oxygen will be my Oxidizing...

Homework Statement Please help me in chemical equations of redox reactions. Here are the problems. 1. Mixing potassium dichromate, K2Cr2O7, and sulfuric acid, H2SO4, in a test tube. Then, add hydrogen peroxide, H2O2, drop by drop, shaking the solution after every drop. Add until a change...

Homework Statement Balance the following redox equation. KMnO4(aq) + H2S (aq) + H2SO4(aq) --> K2SO4 (aq) + MnSO4(aq) + S(s) Homework Equations Knowledge of oxidation numbers etc. The Attempt at a Solution I simply just cannot figure out where to start and would like basic...

Not particually a paradox, just liked the word play. Anyway... The definition of a redox reaction is a reaction with both reduction and oxidation. As we know, oxidation is loss, reduction is gain of electrons. So redox is a reaction with both loss and gain of reaction. Does it follow that...

Because if redox is the transfer of electrons between atoms, and ionic bonding is when one or more electrons go are transferred from one atom to another, wouldn't that mean it is basically a redox reaction?

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...