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

learn more… | top users | synonyms

0
votes
0answers
7 views

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 ...
3
votes
2answers
62 views

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 ...
0
votes
0answers
16 views

Strategy to determine half-reactions of synthesis and decomposition reactions [closed]

Question: For the following equations, what strategy would be used to determine the two half reactions. \begin{aligned}\ce{ (1) && Mn(OH)_{2(s)} + H_{2}O_{2(aq)} &->T[base] ...
0
votes
0answers
21 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 ...
0
votes
1answer
16 views

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 ...
1
vote
2answers
56 views

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 ...
1
vote
2answers
48 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 ...
0
votes
1answer
14 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 ...
3
votes
1answer
39 views

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 ...
2
votes
2answers
47 views

Why does blood get further oxidized than Iron oxide?

Oxygenated blood is bright red and deoxygenated blood is dark red or brown. If you take oxygenated blood and leave it in the air it will turn dark red, then brown, then finally a bluish green from ...
2
votes
0answers
33 views

Elemental Potassium as both an oxidizer and a reducer

On this table I realized that elemental potassium could adopt oxidation states of -1, 0, and +1. http://en.wikipedia.org/wiki/List_of_oxidation_states_of_the_elements Does this mean that elemental ...
2
votes
2answers
34 views

Average Oxidation State - Utility?

What is the purpose of calculating an average oxidation state for a certain element in a compound? Hence the “average oxidation state” of carbon in acetic acid is 0. And the oxidation state ...
2
votes
1answer
36 views

Hydrogen Peroxide as an Oxidizer

Why is HOOH such a good oxidizer? I understand that the oxygens in HOOH are in a negative 1 oxidation state, and that oxygen generally adopts an oxidation state of negative 2. I also know that ...
2
votes
1answer
33 views

Corrosion of metals and observations in the agar medium?

I want to know which metals oxidize and which is reduced and changes in medium and observations? According to my knowledge more corrosion will take place in Zn and Fe also corrode. Then copper ...
3
votes
1answer
24 views

What makes sulfur-containing compounds such good antioxidants?

Many sulfur-containing compounds (like glutathione and cysteine groups) have high antioxidant activity. Why?
6
votes
1answer
38 views

Reaction mechanism of combustion of H2?

After a discussion about the usefulness of hydrogen fuel for cars with a friend of mine, I wondered what the reaction mechanism for combustion of $\ce{H}_2$ was. I only study (well almost) organic ...
0
votes
1answer
39 views

How do I find out if ions are oxidised/ reduced based on half cell potentials?

I have a question that I keep getting wrong and I need some help on it. Assuming standard conditions, answer the following questions. (yes/no) Is $\ce{Fe^{2+}(aq)}$ capable of reducing ...
3
votes
1answer
30 views

can sodium persulfate etch or damage a titanium heater?

I use Sodium Persulfate to etch copper on a PCB process. I have been using glass heater on the etching tank but the glass is too fragile; it breaks too easily. I read that titanium heater is used ...
3
votes
1answer
63 views

On spontaneity of a redox reaction

Suppose we have a redox reaction and we want to see in what direction the reaction is spontaneous. We do this by comparing the standard reduction potentials of the sub-reactions available in the main ...
3
votes
1answer
62 views

What do the half-reactions need to be for balancing a redox reaction in an acidic medium?

Question: Balance the following reaction: $\ce{CuS + SO4^{2-} -> CuO + SO2}$ My Efforts: Number mentioned in the brackets oxidation number of S I have found out that the oxidation ...
1
vote
2answers
32 views

Why is coating with an oxide considered oxidation

I looked up the word oxidize and one of the definitions is to make it an oxide which is what happens when iron gets rusty(even though there is also iron hydroxide in rust). Another was to coat with ...
2
votes
1answer
80 views

Finding the Oxidation number

I have got the homework to balance the following redox reaction. $\ce{Cr(OH)3- + HO2- -> Cr2O7^{-2} + OH- }$(Basic medium) To balance this reaction first thing we need to do is to find the ...
2
votes
1answer
35 views

Is there a database which give reaction constant?

For instance, I have a chemical reaction like : $$\ce{Fe^{2+} + $0.5$O2 + H^{+} ->Fe^{3+} + $0.5$ H2O}$$ And I would like to use Action-Mass law, but I need to have equilibrium constant for this ...
3
votes
1answer
46 views

Any possible additives to a drain cleaner I use as a source of NaOH?

It is in pellets. And the box says main ingredient $\ce{NaOH}$ at least $30\%$ (I hope it's more). The box also says "aluminium catalyst". My goal was to take these pellets and dissolve them in water ...
2
votes
1answer
37 views

Reduction and Oxidation - Alternate definitions

Why is reduction defined as the gain of hydrogen? Is it because hydrogen has a very low electronegativity and easily donates its electrons to other elements? From what I understand reduction is ...
1
vote
1answer
25 views

Redox properties of methyl radical

The methyl radical, $\ce{.CH3}$, is a strong oxidant and a strong reductant according to Wikipedia. Why is this so? Any additional reasons to the ones below? I know that an oxidant itself is ...
2
votes
2answers
55 views

How does a simple alkaline battery work?

The basic + - electrolyte set up. Modern batteries and the like. How exactly do they work?
6
votes
2answers
98 views

Why do acids favor the oxidizer? And bases the reducer?

Simply put, why does adding acid to the cathode up the cell voltage? From what I understand, acids are proton donors. Do these positive protons attract electrons toward the cathode compartment of the ...
3
votes
1answer
48 views

Rust forming and being washed off by the same substance

I have noticed that when exposed to water for a few days the water turned the steel in my wagon into rust. After several more weeks the rust that formed is dissolved and once I pour the water out ...
2
votes
1answer
44 views

What are the oxidation states in Borohydride (BH4-)

The CRC Elecrochemical Series and the solution to our exercise suggest that the oxidation states of borohydride are -V for Boron and +I for Hydrogen. Since H (2.2) is more electronegativ than B ...
2
votes
1answer
70 views

On Spontaneity of the Redox Reactions

According to this Mc Graw-Hill link during a spontaneous redox reaction Gibbs Free Enthalpy must decrease and at the same time the change in the Gibbs Free Enthalpy is the maximum electric work that ...
1
vote
1answer
43 views

Kinetic validity; redox reactions

What's the kinetic validity of the following way of balancing the above redox reaction? I've done some searching of the literature; I've never come across oxide anions being mentioned in redox ...
4
votes
1answer
54 views

Why is the water reduction of oxygen favored in acidic conditions?

The standard reduction potential of diatomic oxygen in acidic conditions is +1.23 volts. However, the standard reduction potential of diatomic oxygen in basic conditions is only +0.40 volts. Why ...
1
vote
1answer
55 views

Can I perform electroplating with sodium carbonate and copper?

I want to avoid anything poisonous during electroplating. I can't avoid copper oxide though. I have dissolved $\ce{Na2CO3}$ in water and I'm trying to electroplate aluminium with copper: As you ...
0
votes
2answers
44 views

Can I use sodium hydroxide (NaOH) to remove oxides from metals?

Sodium hydroxide dissolved in water is a very strong base. I think this could mean it could de-oxidate the metal oxides during re-ox reaction. Basically, I ask whether the following happens: ...
5
votes
1answer
95 views

Rusting of an Iron nail at oil water boundary surface

Recently at school, I did some experiments on corrosion. Everything mostly went as expected, but the result in one of the test was quite baffling. This test had an iron nail in water with some of ...
3
votes
1answer
77 views

Can Lead (Pb) oxidize Tin (Sn)?

According to my textbook, element $\ce{X}$ can oxidize element $\ce{Y}$ if $\ce{X}$ was lower in the activity series. Lead is lower than Tin in the activity series table in the textbook, but the ...
3
votes
3answers
80 views

Which electrodes do not corrode at all?

I had used spare pieces of metal to perform electrolysis. They all had the disadvantage that they corrode when used as anode - and some of the oxides are toxic (copper, chromium). I've found that ...
-2
votes
3answers
65 views

Can redox reactions involve only non metals?

When non metal react they form molecule, and whether the bond is polar or not, the elements in the molecular compound will not have charges what so ever, because they are not ionic. But can non metals ...
1
vote
1answer
33 views

Why is standard reduction potential an intensive property?

My book says that Since the number of electrons lost must equal the number gained, the half-reactions must be multiplied by integers as necessary to achieve the balanced equation. However, the ...
2
votes
2answers
50 views

Sulphur oxoacid forming

I got this reaction and I can't figure out the end products $$\ce{SO2 + S + CaO + Na2SO4 -> Na2S2O3 + ~?}$$ Guessing some calcium sulphur salt should form, but which one?
0
votes
0answers
29 views

Reduction of MnO₄⁻ to MnO₂ in alkaline solution

In acidic medium, $\ce{MnO4-}$ is reduced to $\ce{Mn^2+}$ ions while in alkaline medium, it is reduced to $\ce{MnO2}$. Why is it so?
2
votes
1answer
81 views

Balancing redox equation

So I had these two reactions that confused me .. I tried the standard way of balancing it (Putting oxygen number everywhere, +1,+2,-2 etc.) and then go on with it but it didn't work So anyways here ...
3
votes
1answer
54 views

In a redox reaction, why does more than one oxidation state of an element form?

Consider the reaction 100ml 10M $\ce{NaOH_{(aq)}} +$ 100ml 10M $\ce{NaHSO3_{(aq)} +}$ 100mL 0.01M $\ce{KMnO4_{(aq)}}$ In the picture posted here, the left columns give information on the Molarity of ...
2
votes
1answer
38 views

Calculating Redox Potential; Coupled Reactions

For the reaction of silver and hydrochloric acid to form silver chloride: would the following be the correct way to couple the below two half reactions? $\ce{2Ag(s) + 2Cl^- ->2AgCl(s) + 2e^-} ...
2
votes
1answer
140 views

Why is it that neither silver nor copper react with a strong acid?

$\ce{Fe}$, $\ce{Mg}$, $\ce{Ni}$, $\ce{Pb}$, $\ce{Sn}$, and $\ce{Zn}$ all react when they (in solid form) are submerged in an acid solution with the presence of a strong acid like $\ce{HCl}$, but ...
0
votes
1answer
27 views

What exactly is the “oxygen reduction reaction”?

Is it $\ce{O2(g) + 4H^+(aq) + 4e^- \rightarrow 2H_2O(l)}$ and are there multiple types of ORR? See here for context: http://www.nature.com/srep/2014/140122/srep03821/full/srep03821.html
1
vote
2answers
47 views

Moles of Reduction Product

Regarding the above question, how would one solve it? Would it be valid to simply say that I know that 6 electrons are being transferred because we have this skeleton equation (balanced for ...
0
votes
1answer
23 views

Electrolysis of Strongly Basic Water

What happens when strongly basic water is electrolyzed? I know that the electrolysis of water in strongly acidic solution involves hydrogen protons; will these protons still be involved in strongly ...
3
votes
2answers
111 views

Explanation for the reactions in a saltwater battery with zinc and copper electrodes

I am a physicist, not a chemist. I'm trying to get a basic understanding of the reactions taking place in a battery using a saltwater electrolyte with copper and zinc terminals. I'm writing a general ...