Tagged Questions

Reduction-oxidation reactions: all chemical reactions in which atoms have their oxidation state changed.

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Is a metal hydroxide fully or partly oxidised in insufficient base?

Firstly, my question only applies to transition metal compounds with more than one hydroxide group, otherwise it would be more obvious. The reason I'm asking is in an effort to oxidise some nickel ...
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28 views

How to efficiently reduce of ilmenite to pure titanium?

I am looking for a process in which reduces ilmenite to pure titanium with the highest yield possible. We are to use a process of our choice or one that we have created in conjunction with FactSage to ...
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1answer
18 views

What is the balanced ionic redox reaction of nitrite ions with manganate(VII) ions in acidic solution?

What is the balanced ionic redox reaction of nitrite ions with manganate(VII) ions in an acidic solution? My suggestion is: $\ce{5NO2- + 2MnO4- + 6H+ -> 5NO3- + 2Mn^{+2} + 3H2O}$ ...
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28 views

How to find the balanced reaction equation for the decomposition of potassium dichromate in non aqueous conditions?

I can't find a method to balance a reaction: the heating of potassium dichromate, which forms potassium dichromate (III), dichromate oxide (III) and oxygen. I can't add water products as $\ce{H+}$, ...
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19 views

Why is high capacitance good for the electrode-electrolyte interface? Does high capacitance decrease the impedance? [on hold]

Why is high capacitance good for the electrode-electrolyte interface? Does high capacitance decrease the impedance?
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23 views

hydrogen electrode [closed]

The hydrogen gas in the hydrogen electrode should be bubbled continuously through the electrolyte in a hydrogen electrode in order to satisfy one of the following requirement which is: A. To keep ...
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0answers
18 views

Combustion of table sugar (glucose) [closed]

What is the complete reaction for burning sugar? I need the complete reaction in the form A + B --> C + D + $\Delta H$ I want to make a sugar rocket (a small one), but I can't find the complete ...
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1answer
33 views

Potassium permanganate (VII) + Glucose + Sodium hydroxide =?

I saw this experiment many times but still can'y explain why. The experiment is first prepare two solution. The first one is to dissolve potassium permanganate crystal into distilled water to form ...
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32 views

What happens when oxidizing Ni(OH)2 with a strong base?

In an aqueous solution, Nickel oxyhydroxide is oxidised with a 1:1 ratio of aqueous Sodium hydroxide. My goal is to produce Nickel oxyhydroxide ($\ce{NiOOH}$). Strong Base: $\ce{NaOH + H2O ...
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67 views

Redox Question: Concentration of Pb2+ is unknown

What is the concentration of $\ce{Pb^{2+}}$ in a lake that has a pH of 6.0 and is in equilibrium with $\ce{PbO2(s)}$ and atmospheric oxygen? $\ce{PbO2(s) +4H+ +2e- -> Pb2+ +2H2O}$ log K = 49.2 ...
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43 views

How can I balance the redox reaction of sulfur dioxide with oxygen?

How do I balance this reaction using half-redox equations? $$\ce{2SO2 + O2->2SO3}$$ My work is: Oxidation: $\ce{SO2 + H2O -> SO3 + 2e- + 2H+}$ Reduction: $\ce{H2O + 2e- + O2 -> SO3 + ...
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66 views

Does it matter if all rust is removed before it is painted over?

In the context of automobile repair work, assume a metal surface has rust over it. Does it matter if all of the rust is removed before the metal surface is painted? If it does matter, then why? It ...
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39 views

Reactions that occur at the anode electrode of electrolysis dilute H2SO4

How to know that reaction that occur at the anode electrode is $\ce{2H2O -> 4H+ + O2}$? Why the reaction is not the oxidation of $\ce{SO4^{2-}}$? This problem does not give the E0 of ...
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1answer
31 views

What does oxidizing strength mean?

What does oxidizing strength mean? Does it mean the strength of a oxidation agent that is needed to oxidize the reduction agent, or does it just mean the tendency of a substance to lose electrons ...
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1answer
40 views

which substance has the higher oxidation strength?

I have to decide which one has a higher oxidation strength $\ce{ClO-}$ or $\ce{Cl2}$ $\ce{ClO- + H2O + 2e- -> Cl- + 2OH-}$ $\ce{Cl2 + 2e- -> 2Cl-}$ Will this reaction occur? $\ce{ClO- + H2O ...
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56 views

How does a redox reaction between NaClO and KBr take place? will bromide be oxidised to bromine?

How does a redox reaction between $\ce{NaClO}$ and $\ce{KBr}$ take place? will bromide be oxidised to bromine? $\ce{2Br^{−} + ClO^{−} + H2O ⟶ Cl^{−} + 2 OH^{−} + Br2}$ or will bromide be oxidised ...
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27 views

How does a redox reaction between ClO- and Br- take place?

How does a redox reaction between $\ce{NaClO}$ and $\ce{KBr}$ take place? will bromide be oxidised to bromine? $\ce{2 Br- + CIO- + H2O -> Cl- + 2 OH- + Br2}$ or will bromide be oxidised to ...
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817 views

Does bleach turn a substance white or colorless?

From what I understand, bleach works to weaken the ability of a substance to absorb light. Thus this seems to be "whitening" i.e. reflecting all light. In contrast, colorlessness (according to ...
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1answer
30 views

Why would electrode reaction in galvanic cell stop when there's no neutrality in each cell?

I know that the salt bridge produces ions to balance out the positive and negative ions in each solution, but why won't it work without a salt bride? Would it even work at the start since there's few ...
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1answer
29 views

Terminology of redox reactions: which species are the oxidizing and reducing agents?

I've got a question regarding 'notation' for redox reactions. Suppose you are asked to identify the oxidizing and reducing agents for a simple reaction like this one: $$\ce{Cl2(aq)}+\ce{2KI(aq)} ...
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565 views

Is there non-redox reaction?

Redox reaction is a type of chemical reactions, and the result of electron transfer. But all chemical reactions are somehow involved electron transfer! Are there chemical reactions without electron ...
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Use The Half Reaction Method to Balance the Following Equation in Acidic Solution [closed]

$\ce{Fe^2+ + MnO4- -> Fe^3+ + Mn^2+}$ What steps should I take?
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Nernst equation and electrolysis

Let's say we have a stable solution of $\mathrm{A}_{\left(\mathrm{aq}\right)}^{2+}$ and $\mathrm{C}_{\left(\mathrm{aq}\right)}^{+}$ , with their respective counter-ions. The associated redox ...
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How does copper reduce dilute nitric acid to nitric oxide and concentrated nitric acid to nitrogen dioxide?

Here are the 2 equations: $\ce{3Cu + 2NO3- + 8H+ <=> 3Cu^2+ + 2NO + 4H2O}$ ${E = 0.62V}$ $\ce{3Cu + 2NO3- + 4H+ <=> 3Cu^2+ + 2NO2 + 2H2O}$ ${E = 0.45V}$ The Nernst equation tells us ...
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49 views

What exactly is net ionic equation?

I once saw a problem, iron ions(II) titrated with potassium dichromate to produce Fe(II) and Cr(III). If I am to write the net ionic equation of this reaction, I got to make potassium dichromate on ...
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In this simple redox reaction, why does the Hydrogen oxidize the calcium metal?

I am understanding that the Hydrogen ions oxidize the calcium metal, neutralizing itself and creating a calcium cation. My question is why does the Hydrogen oxidize the calcium? Doesn't it prefer to ...
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1answer
87 views

Redox reactions - alkene to alcohol

How is the "correct" answer not a redox reaction? Isn't the "correct" choice a textbook example of an organic redox reaction? After all, we are breaking a C-C bond and replacing that with a C-O ...
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1answer
43 views

Standard electrode potential for electrolytic vs galvanic cells

Whys is the standard electrode potential (-) for electrolytic cells but positive for (+) galvanic cells. If E°cell > 0, then the process is spontaneous (galvanic cell) If E°cell < 0, then ...
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1answer
102 views

How does salt and water promote corrosion?

I was always wondering why iron only rusts when it gets wet. I know that for example aluminium oxidises on its own on regular basis. I also heard many complains that salt used to remove snow from ...
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Balancing the redox reaction

Question: Balance the following redox reaction: $$\ce{FeS2 + O2 -> Fe2O3 + SO2}$$ My Efforts: I tried balancing with oxidation number method. First of all i determined the oxidation ...
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238 views

Why does a chemical have more than one oxidation number?

Like for group I metals, it is understood that all the elements in the group would have an oxidation number of +1. As far as I know, oxidation number is how much electron the element loses/gains. ...
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Why does potential chemical energy decrease with increasing oxidation of carbon?

I saw an interesting spectrum in my biology class the other day. On the left end was methane - the least oxidized form of carbon - and the most energetic form of carbon (at least relative to what else ...
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75 views

Electron Transfer in Organic Reactions: Why Does Brown Iron Oxide Improve Burn Rate of Rocket Candy?

On wikipedia, this statement exists about rocket propellant aditives: Metal oxides have been found to increase the burn rate of sugar propellants. [...] Most often used are iron oxides. Red iron ...
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45 views

Sodium metal reduction of chloroform

In discussing how best to deuterate chloroform, it occurred to me that we could use sodium metal to reduce hydrogen into hydrogen gas. If this could actually happen, this would be a great thing - we ...
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1answer
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What are the other definitions of redox reactions besides the gain or donation of oxygen?

As my teacher told us, oxidation is the gaining of oxygen and reduction is the donation of oxygen. In my reference book there are other definitions of this reaction. So please give me some alternate ...
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1answer
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Potassium Atom can act as reducing agent, yet ion cannot?

I am currently looking through a revision sheet, however it has caught me on a question 'Explain why a potassium atom can act as a reducing agent yet a potassium ion cannot'. I have done brief ...
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1answer
22 views

pH Changes in primary cells

Primary Cells - pH changes during discharge Alkaline Cell: Manganese Dioxide Zinc Alkaline Cell Anode (-) $\ce {Zn(s) + 2OH^{−}(aq) → ZnO(s) + H2O(l) + ...
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Fuel Cell Chart - Anode, Cathode, Electrolyte

Can someone please check my table to make sure I have the correct information. I am especially unsure of the parts highlighted in yellow:
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1answer
85 views

Why are imines more susceptible to reduction than carbonyl compounds?

Why are imines more susceptible to reduction than carbonyl compounds? Imines react with $\ce{NaCNBH3}$ while the carbonyls don't.
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Determining redox half-reactions of single displacement reactions

For the following double displacement half reaction, the half reactions can be determined easily using the oxidation numbers. $$\ce{MnO_{4(aq)}^{-} + IO_{3(aq)}^- -> MnO_{2(s)} + IO_{4(aq)}^-}$$ We ...
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How to get sodium from sodium aluminate?

The sodium aluminate is formed when aluminium or aluminium hydroxide reacts with water solution of lye. After drying the water you'll end up with white crystals - sodium aluminate. I was wondering if ...
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Why are metal oxides generally more stable than their corresponding elemental forms?

Why is the oxidation of certain metals such as iron favorable from a thermodynamic standpoint? What is it about these metal oxides that makes them inherently more thermodynamically stable than their ...
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Nitrobenzene reduction with (tin) Sn catalyst: Why is C-H bond cleavage preferred over O-H bond cleavage?

I am trying to understand this mechanism for nitrobenzene reduction with $\ce{Sn/HCl}$. I do not understand why it implies that you pull off the $\ce{C-H}$ hydrogen instead of the $\ce{O-H}$ hydrogen ...
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101 views

What factor determines the strength of reducing agents and oxidizing agents

The best reducing agents are located at the bottom left of the periodic table(low electronegativity) and the best oxidizing agents are located at the top right of the periodic table(high ...
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117 views

HI/P reduction mechanism

I recently answered a question about Breaking Bad's initial methamphetamine production method (i.e. the reduction of (pseudo)ephedrine). The reaction is as follows: (Source: ...
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Writing Half-Reaction for Iron-Hydroxide Oxidation Reaction

Here is the unbalanced equation.$$Fe(OH)_{2(s)}+O_{2(g)}\rightarrow Fe(OH)_{3(s)}$$Therefore, one half reaction is $$Fe(OH)_{2(s)}+O_{2(g)}\rightarrow Fe(OH)_{(3s)}$$ and the other half reaction is ...
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Why is formic acid considered an acid if it is a reducing agent?

My understanding was that since the acceptance of Lavoisier's revised Easter Memoir of 1778, all acids were understood to be oxidising agents.* However, formic acid is often listed as a reducing ...
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68 views

Why is chloride oxidised instead of water in copper chloride electrolysis?

For the Electrolysis of Copper Chloride: Cathode: $\ce{Cu^{2+} + 2e- <=> Cu}$ Anode: $\ce{2Cl <=> Cl2 + 2e- }$ I am confused about the reaction taking place at the anode. Wouldn't ...
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1answer
24 views

Oxide Anions in Redox

Consider the following unbalanced redox equation: $\ce{NO_2^- +e^- -> NO3^-}$ This occurs in acidic media. My professor would note that an negative two oxidation state oxygen "disappears" from ...
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1answer
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In a mixture of ammonia and hydrogen hypochlorite, how do I determine the oxidising and reducing agent?

$$\ce{NH_3 + HOCl <=> NH_2Cl + H_2O}$$ How do I figure out what the oxidizing agent is and reducing agent? I know that the oxidizing state of $N$ in $\ce{NH_3}$ is $-3$, but I'm not sure how to ...