Redox Definition and 204 Threads

Homework Statement How many molecules of hydrogen peroxide were in the whole bottle? (See Data) Homework Equations Data. Balanced equation. 6H+ + 2Mno4- + 5 h2o2 --> 2Mn2+ + 5O2 + 8 H2O I used 26.85 mL of MnO4- the first trial, and 29.80 mL in the second trial. 10.000 g of H2O2 used in the...

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...

To determine the concentration of Fe (aq)2+ by a redox titration, we could use an acidified standard solution of A. Sn2+ B. Pb2+ C. HCl D. H2O2 I know the answers H2O2, but i don't know how to get it. How doe redox titrations work?

I have read a little bit about some industries deaerating water used in boilers made of iron to prevent them from becoming damaged. I think this is because removing dissolved oxygen from the water lowers its redox potential. I think that this works because once the redox potential of the...

Homework Statement A mass of iron ore weighing 0.2792g was dissolved in dilute acid and all the iron was converted to Fe2+(aq). The iron II solution required 23.30ml of 0.0194M KMnO4 for titration. Calculate the percentage of iron in the ore.Homework Equations Wrote out my redox reactions...

Homework Statement V205(s) + U(s) ---> V0 2+(aq) + UO2 2+(aq) *Balance the rxn under acidic conditions. *Balance the rxn under basic conditions.

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?

Seems like a strange question, but it just appeared on one of my tests. My guess would be redox, but what is the logic behind the answer? Thanks for the help!

Homework Statement Give the net ionic equation for this reaction: Fe(NH4)2(SO4)2.6H2O + KMnO4 Homework Equations Reducing reaction is 4H+ + MnO4- + 3e ---> MnO2 + 2H2O Oxidation 3Fe+2 ---> 3Fe+3 + 3e The Attempt at a Solution 4H+ + MnO4- + 3Fe+2 ---> MnO2 + 2H2O +...

Homework Statement I'm working on redox tables and I'm really confused. I know how to write out the half reactions, but i don't understand how you tell which is the strongest oxidizing agent or the weakest. Same thing with reducing agents which is strongest or weakest? Help please...

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...

Zn---Zn+2 + 2e-

Hi, I just learned about oxidation and reduction reactions and I have some questions. Are all ionic reactions redox reactions? Do elements that make up covalent compounds always have an oxidation number of zero because they only share electrons, not give or take? That is what I was thinking...

OF2 --> F- + O2 + H2O OF2 --> F- 2H+ +OF2 --> 2F- + H2O 2H+ +OF2 + 4e- --> 2F- + H2O This is as far as I can get. I don't know how to do the other half of the redox since the equation would be: OF2 --> O2 + H2O What do I do here? Maybe I am not setting this up correctly?

Homework Statement Balance the following redox reactions occurring in an acidic solution. Homework Equations PbO2(s)+I-(aq)---->Pb2+(aq)+I2(s) The Attempt at a Solution 1.) half reactions: a.) reduction: I-(aq)----->I2(s) b.) oxidation: PbO2(s)------>Pb2+(aq) 2.) balance...

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-...

I'm having a lot of trouble with this problem! What mass of lead sulfate is formed in a lead-acid storage battery when 1.34 g of Pb undergoes oxidation? the answer needs to be in grams

Homework Statement Write the net ionic equation for H2SO4(aq) to the KMnO4(aq)Homework Equations The Attempt at a Solution I am confused on which one should i write. The first method is to list all the species, then use the data book to find which one is the strong OA and SRA. Multiply one or...

I was taught in high school that all reactions are governed by the valence electrons. of the atoms involved. Then I was taught that the term "redox reaction" applied only to rxns where e- were exchanged, or oxidation numbers were changed. But the first fact would lead me to believe that...

Homework Statement a 0.245 mol/L silver chloride solution is mixed with 50.0 mL of 0.200 mol/L zinc iodide solution. what volume of silver chloride solution is needed for a complete reaction? (answer is 81.6mL) Homework Equations The Attempt at a Solution Ag+ is the strongest OA, I- is the...

We have been given the task to write a feature article for a magazine such as new scientist on an area of interest within the following fields: -Reduction and oxidation -Electrochemistry -Electrowinning I cannot find anything that interests me and has enough relevant information to start...

Homework Statement HIO3 + FeI2 + HCl ==> FeCl3 + ICl + HOH Homework Equations Directions say it's in an aqueous solution, and HCl is a reactant, so you can add H2O and H+ to balance, right? The Attempt at a Solution I first found all the oxidation states: HIO3 H = +1 I = +5 O...

iron(ii) can be determined by redox titration with a cerium (iv) solution. the oxidation reduced reaction is fe2+ + ce2+ = fe3+ + ce3+ what is the concentration of fe2+ if it requires 21.35mL of .3136 ce4+ to titrate a 10.00mL aliquot to the endpoint.

Homework Statement Which is the reducing agent in this equation, if any? Cr2O7 2- + 2OH- --> 2CrO4 2- +H2O Homework Equations The Attempt at a Solution After giving the elements their oxidation numbers I found the reducing agent to be Cr2O7 2- Is this correct?

Hi there, I have some trouble understanding redox reactions. Here is the question: Sulphuric acid is one of the strongest inorganic acides which in some reaction shows oxidation properties. In which of reactions below, sulphuric acid acts as oxidating tool? A. \text{H}_2{SO}_4 +...

Homework Statement Balance the equation (Note: the coefficients provided may be wrong): 3 Co(s) + 8 H+(aq) + 8 NO3-(aq) → 3 Co2+(aq) + 6 NO3-(aq) + 2 NO(g) + 4 H2O(l) The Attempt at a Solution I started out by doing a half reaction Co → Co 2+ +2e- This...

Hey guys, I'm really new to Redox reactions so any help is greatly appreciated. How do I identify the oxidizing and reducing agents from the chemical equation; 3N2H4 --> 4NH3 + N2 Why is it that the agents are products of the equation, shouldn't they be the reactants? I'm also not really...

Homework Statement hey guys this question looks easy, but I am confused? any help/tips would be appreciated Which of the following is the best reducing agent? Cl2 + 2e- 2Cl-; E° = 1.36 V Mg2+ + 2e- Mg; E° = -2.37 V 2H+ + 2e- H2; E° = 0.00 V Homework Equations The...

Homework Statement 0.9966g of Iron Wire was used... Iron Wire was placed in 200cm3 of 1m Sulphuric Acid, this was heated and the hydrogen gas vented off... Producing... Fe + H2SO4 = FeSO4 + H2 Fe = Iron H2SO4 = Sulphuric Acid FeSO4 = Ferrous Sulphate H2 = Hydrogen This...

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...

I have a chemical practical coming up in a few weeks time and need help sussing out some questions. I know that the practical will be on redox titration between h2o2 and KMnO4, I wanted to know how I could determing the concentration of h2o2. Could someone run through a specimen calculation...

If a 2.893 g sample of an unknown containing iron requires 28.45 mL of the permanganate solution described in Pre-Laboratory question 3 to reach the endpoint what is the % Fe in the unknown?

Homework Statement You are provided with a solution of hydrogen peroxide which is known to be approximately ‘100-volume’. Plan two experiments that would enable you to determine the exact concentration of H2O2 in mol dm-3, in this solution. One of your experiments should involve a redox...

Homework Statement Bleaching powder, Ca(OCl)Cl, reacts with iodide in acidic medium according to the equation: OCl– + 2 I– + 2 H3O– ---> I2 + Cl– + 3 H2O How many millilitres of 0.0645 M Na2S2O3 are required to titrate the iodine liberated from a 0.6028 g sample of bleaching powder...

I have read about 20 explanations and tutorials and heard people talk about reducing and oxidizing compounds countless times but the concept continues to elude me. I know that oxidizing has 3 meanings but in this case it refers to one compound taking electrons off another compound and reduction...

Homework Statement How many electrons are transferred in the following reaction? 6 Br^- (aq) + Cr2O7^2- (aq) + 14 H^+ --> 2Cr^3+ (aq) + 7H2O + 3Br2 (l) a) 1 b) 2 c) 3 d) 6 e) 14 Homework Equations The Attempt at a Solution Redox reactions really confuse me, but I gave it a...

Homework Statement redox cyclohexene and H2O2 Homework Equations The Attempt at a Solution C6H10 + H2O2 > C6H10O4 + H2O half reations (4 H2O + C6H10 > C6H10O4 + 8 H+ +8e-) * 2 oxidation (2e- + 2H+ + H2O2 > 2 H2O ) * 8 reduction 8 H2O + 2 C6H10 + 16e- + 16H+ +...

The redox midpoint potential (Eo’) of NAD+/NADH at pH 7.0 is -320 mV. If the total concentration of {[NAD+] + [NADH]} is 1.5 mM in cells, and the cellular redox potential is about -200 mV, what are the concentrations of [NAD+] and [NADH], respectively? Under certain oxidative stress...

Homework Statement Suppose 1.00g of Mn Reacts with an excess of 6.00M HCl, how many grams of H2 gas is produced? What volume hydrogen gas is produced by this reaction? Homework Equations density of hydrogen gas is 0.08988g/L conditions: 0 degrees celsius, 1 atm pressure The...

Homework Statement OCl- is reacted with I- in acidic solution to generate I2. The I2 generated is then titrated using a solution of Na2S2O3. If you look at the sum of the two reactions above, information about S2O3- can be used to determine the amount of I2 and thus the amount of ClO-...

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 Balance the equation for disproportionation reactions. Homework Equations S8(s) ----> S2-+S2O32- (basic solution) The Attempt at a Solution I attempted into do this with the ion electron method, obtaining an answer: 3S8 + 24OH- ----> 16S2- + 4S2O32- +...

hey I'm in yr 12 chemistry in Australia and I am having problems understanding redox reactions equations, i understand oxidation states and a little bit but i can't figure our about the electrons calculus, i can do the rest of the formula or steps but i cannot seem to be able to calculate the...

Hello guys. I have been a lurker at these forums for quite a while now, they are very helpful if you have run into a snag in your homework. :) What I have here is a redox reaction, and I will be very grateful if someone could confirm my answers. H+...

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...

Redox reactions can take place in both acid or basic solutions, that I know. But, what if the type of solution in which the reaction occurs is not given? Am I to assume it is acid or basic?

1. What volume of a 0.0200 M KMnO[SIZE="1"]4 solution is required to oxidize 40.0 mL of 0.100 M FeSO[SIZE="1"]4 in sulfuric acid solution? 2. MnO[SIZE="1"]4-1 + H+ + Fe+2 --> Fe+3 + Mn+2 + H[SIZE="1"]2O 3. I honestly have no idea how to tackle this, I failed the titration portion...