Questions tagged [oxidation-state]

Oxidation state is a concept, which assigns hypothetical charges to atoms in compounds. This tag should be applied to questions which relate to that concept or to oxidation states in atoms of compounds.

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1answer
204 views

Can two positive ions be next to each other in a formula?

Let's say I want to find the oxidation numbers of the atoms in a chemical formula. For example: In $\ce{H3AsO3}$, Oxygen has a $-2$ charge. They're $3$ of them, so its $-6$ Hydrogen has a $+1$ ...
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Checking how chemically plausible a molecular structure is? [closed]

I was working on a project, which dealt with the plausibility of a chemical structure. So i wanted to know on what basis can i check it? It would be nice if someone could list down all the features ...
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1answer
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How does one calculate oxidation states? [duplicate]

For example, how could I calculate the oxidation state of lead in $\ce{PbS}$? Or for that matter how would I calculate it for sulfur? Or I have two unknowns, for example sulfur in $\ce{PbSO4}$? Do I ...
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Why does the oxidizing strength of the chlorates decrease with increasing oxidation number?

Here is a table of the standard reduction potentials of the chlorates from wikipedia: Intuitively, one would expect that the more positive the oxidation state, the more oxidizing that compound would ...
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4answers
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Is perchloride the same as perchlorate ion?

I read about perchloride in a talk and after trying to search for its chemical formula, the search results imply that perchloride is actually named perchlorate. Is this correct?
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What is the oxidation state of oxygen in Na2O2?

I am asked to determine what is the O.S. of oxygen in $\ce{Na2O2}$ I was under the impression that oxygen had a charge of -2 and I multiplied that charge by 2 giving me a total of -4. However, the ...
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1answer
4k views

Oxidation state of nitrogen in HN3

The book asks me to find the oxidation state of nitrogen in the compound below (the structure is not the one given in Wikipedia for HN3): To find the oxidation state using Lewis structure, I have ...
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2answers
145 views

How to determine oxidising and reducing agents in the reaction between ammonia and hypochlorous acid?

How do I figure out what is the oxidizing agent and the reducing agent in the following reaction: $$\ce{\overset{-3}{N}\overset{+1}{H}_3 + \overset{+1}{H}\overset{-2}{O}\overset{+1}{Cl} <=> \...
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1answer
791 views

Why do disproportionation reactions take place?

I want to know what are the conditions when disproportionation reaction is feasible. Is it just because of stability factors or it has other dimensions to it. As an example: $$\ce{3HNO2 -> HNO3 + ...
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1answer
52 views

For group 13 elements M³⁺, why is the formation of MCl₄⁻ more favorable than for group 12 elements M²⁺?

I'm not a chemist and I'm trying to understand a chemistry point from a talk I went to recently. Any help would be much appreciated. The speaker was talking about $+3$ (Group 13) elements in the ...
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1answer
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How electron configuration is related to the oxidation state of an element such as sulphur and can this be extended for elements in other blocks? [closed]

The question arises from trying to get where does the values of $-2$, $0$, $+2$, $+4$ and $+6$ from the electron configuration. The electron configuration for sulphur $(Z=16)$ is $[Ne]3s^23p^4$. It ...
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39 views

CuS+HCl is it a reduction or oxidation reaction

How do we identify whether a reaction is oxidation or reduction and please let me know whether the equation given above is oxidation or reduction.
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Why oxides with the element in higher oxidation state are more acidic

We see this trend of acidic-basic property of oxides in most cases: $\ce{Mn2O7}$ is acidic, $\ce{MnO}$ is basic, the intermediate oxides are progressively less acidic and more basic, as the oxidation ...
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Oxidation states the elements in nitrosyl chloride

I have read that $\ce{NOCl}$ dissociates to $\ce{NO+}$ and $\ce{Cl-},$ and the various reasons stated as such seem fine. But what I don't get is this: if we follow the actual rules of assigning ...
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3answers
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Can you create different colors of rust on iron? [closed]

I am looking to see if anyone out there can tell me if there is a way to create different colors of rust on iron. I'm specifically looking to see if I can create blue rust without heating the metal ...
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1answer
12k views

How do I find the oxidation number of a coordination complex

I actually know how to calculate the oxidation number for coordination complexes but some complexes like the below are giving some reistance $\ce{[Cu(NH3)_2][Fe(H2O)_3]}$ (diamminecopper(?) ...
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1answer
701 views

How does Potassium Hexfluoronickelate(IV) exist in a stable state?

Nickel generally does not exist in a $+4$ Oxidation state. Wikipedia has the following to say regarding Nickel(IV): Ni(IV) is present in the mixed oxide $\ce{BaNiO3}$. ....... Ni(IV) remains a rare ...
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1answer
171 views

Negative oxidation state

Why doesn’t aluminum have negative oxidation states? In almost all compounds of aluminum which I know of has positive oxidation state. It has valence EC [Ne] 3s2 3p1 , my teacher told it usually ...
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2answers
6k views

Why doesn't iron(III) iodide exist?

$$\ce{Fe2O3 + 6HI -> 2FeI2 + I2 + 3H2O}$$ Why don't we get $\ce{FeI3}$? After all, iron's oxidation state is $+3$ in the reagent. Should one just memorize that up to bromine, it's $\ce{FeX3}$, ...
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1answer
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How to balance more complex redox reactions?

I'm in an advanced level chemistry course, and so far we've been introduced to balancing redox reactions. The basic ones like $$\ce{MnO4- + Cl- -> Mn^2+ + Cl2}\tag1$$ are pretty easy for me, but ...
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3answers
188 views

Determining the oxidation state of a bridging platinum complex

I want to ask a question about determining the oxidation state of a Platinum complex. I was presented today with the following complex and asked to comment on the oxidation state and hence the d-...
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0answers
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Oxidation number of Oxygen in peroxides: -2 or -1?

My textbook says that the oxidation number of Oxygen in peroxides is -2, but when I searched up the internet, I found it to be -1. It could probably be a misprint in my book, but I am still not sure. ...
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1answer
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why is both types of oxides (Eo2 and Eo) of group 16 acidic? [closed]

the oxidation state of E in Eo2 and Eo3 is +4 and +6 respectively ...then how can both of them be acidic ?
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Black substances covering Aluminum Electrode

I have use two aluminum pieces as electrodes to electrolys salt (NaCl) water. After the experiment, I found that wherever electricity flows, the electrode will be covered in some blackish substances. ...
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162 views

Oxidation number of Si in SiH4

Wikipedia has the following reaction: $\ce{Mg2Si + 4 HCl → 2 MgCl2 + SiH4}$ This seems to be a double displacement (metathesis) reaction, where $\ce{Si}$ has oxidation state $-4$. However, I ...
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136 views

Oxidation state of Manganese [closed]

We know that Mn shows variable oxidation states ranging from +2 to +7 but why is +1 oxidation state of Manganese(Mn) not stable? The +1 oxidation state of Mn would have a configuration of 4s1 3d5. ...
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1answer
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Why don't ligands affect the oxidation state of the central metal ion?

If $\ce{Fe^3+}$ were complexed with 6 $\ce{H2O}$ ligands, the resulting complex ion would be $\ce{[Fe(H2O)6]^3+}$, and the central metal ion would still have the same oxidation state of +3 as it did ...
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1answer
38 views

Naming a coordination compound

I was asked to determine the coordination compound which has the name: $$\text{triamminetrinitritocobalt(I)}$$ I thought it must be: $$\ce{[Co(NH3)3(ONO)3]^2-}$$ The $-2$ charge can be deduced by ...
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2answers
715 views

How is Zn not a transition metal? [duplicate]

A transition metal can be defined as an element that possesses an incomplete sub-level in one or more of its oxidization states. In the textbook I'm reading, it claims that zinc is not a transition ...
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0answers
21 views

Is fluorinated steel corrosion resistant from normal oxidation?

I've recently learned of a compound named Chlorine trifluoride a powerful fluorinating agent. The common way to store it seems to be in regular steel drums where it flash oxidizes the inside of the ...
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276 views

Oxidation state of chlorine in ClO

Today, I had a friendly debate with my friend on what should be the oxidation state of $\ce {Cl}$ in the chlorine monoxide radical. I took the view that it should be $\ce {+2}$ while he took the view ...
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1answer
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How to assign oxidation number of sulfur in thiocyanate anion?

Recently I was trying to balance a redox chemical equation: $$\ce{CuSCN + KIO3 + HCl <=> CuSO4 + KCl + HCN + ICl + H2O}$$ The equation is in principle simple to solve; one element ($\ce{I}$) ...
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38 views

Clearing my doubt over Electronegativity and oxidation state

I was doing a question in which we were required to find the oxidation state of $\ce{H3PO3}$. I knew the structure that is: Now, Phosphorus being less electronegative than oxygen get $+2,+1,+1$ ...
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1answer
72 views

Question About Reversible Reactions and Batteries

So my book says that the batteries we have considered so far( Daniell cells) are low life span, because they reach equilibrium too fast. In the next paragraph, it says they are also made by ...
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1answer
209 views

How can batteries reach equilibrium if the reactions are irreversible?

My book says that the batteries we have considered so far (Daniell cells) have a low life span because they reach equilibrium too quickly. In the next paragraph, it states they are also made by ...
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1answer
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How is the triferric tetroxide of iron possible?

If oxygen has a valency of $-2$, $4$ of it would result in $-8$. But iron doesn't have a (variable) valency of anything that goes to $-8$. Then how is $\ce{Fe3O4}$ possible?
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306 views

The oxidation state of iodine in iodoxybenzoic acid

I am slightly puzzled by this seemingly trivial question. The idea behind assigning oxidation states is simply to treat every single bond made by the atoms as ionic bonds. That is to say, both the ...
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2answers
85 views

Why is this reaction not a redox? [closed]

My question may seem too simple. But I couldn't find why this is not a redox. $$\ce{Hg2(NO3)2 + 2KBr -> Hg2Br2 + 2KNO3}$$ In $\ce{Hg2(NO3)2}$ compound atoms have following states: O: -2 N: -3 Hg:...
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1answer
33k views

How to calculate valence factor (n-factor) for a element?

Suppose I am given some reaction in which $$\ce{C6H12O6 -> CO2}$$ and I want to calculate n-factor for this reaction to ultimately calculate equivalent weight of carbon for this reaction. Since $$...
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2answers
695 views

Oxidation states of boron

I have just been looking at https://en.wikipedia.org/wiki/List_of_oxidation_states_of_the_elements and found that boron has a -5 oxidation state. I would like to know which boron compounds form ...
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1answer
67 views

Are there chemicals that absorb and release upon heating oxygen more efficiently than potassium oxide? [closed]

$\ce{K2O}$ absorbs oxygen forming $\ce{K2O2},$ which decomposes to $\ce{K2O}$ and $\ce{O2}$ at 500 °C. This means that $\ce{K2O}$ can absorb up to 17% its mass of oxygen. Are there other substances ...
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1answer
87 views

Do different oxidation states of the same element have the same emission spectrum?

I looked at the flames of copper (I) chloride and of copper (II) chloride through a spectroscope and they looked the same. The flame colour is the same too. But since they have different oxidation ...
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1answer
55 views

Balancing the chemical equation using Oxidation Number Method [closed]

Permanganate ion reacts with bromide ion in basic medium to give manganese dioxide and bromate ion. Write the balanced ionic equation for the reaction. Please balance the equation using the oxidation ...
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2answers
68 views

Materials used in cooktop heating element, and reason for black appearance

I have been interested in the structure of heating elements/coils used in cooktops. I am referring to something such as in the following picture: I have a cooktop at home with such elements, and at ...
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1answer
62 views

Cup with vinegar/salt/copper solution previously in it ran through dishwasher

Someone enjoys making jewelry, and saw an online tutorial saying that you can mix equal parts of vinegar and salt, and leave copper in it for a while to oxidize it, and turn it green. After doing ...
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1answer
52 views

Why do we need to use oxidation number in order to balance a complex chemical reaction easily in an acidic or alkaline medium? [closed]

I have been trying to balance this chemical reaction in an "acidic" medium without using oxidation number or ion electron method: [$\ce{Fe^2+ + Cr2O7^2- -> Cr^3+ + Fe^3+}$]. Though I can balance ...
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Is it possible to synthesize permanganate electrochemically?

I have been researching the production of peroxy acids and other strong oxidizers. I was wondering if it's possible to produce permanganic acid if I were to cast an anode containing Manganese Dioxide ...
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1answer
1k views

What is the oxidation state of Mn in HMn(CO)5?

What is the oxidation state of $\ce{Mn}$ in $\ce{HMn(CO)5}$? If $\ce{H}$ has an oxidation state of $+1$, then $\ce{Mn}$ should have oxidation state of $-1$, which I'm not sure is possible. On the ...
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1answer
258 views

Which of the following reactions doesn't represent an oxidation-reduction [closed]

Which of the following reactions doesn't represent an oxidation-reduction? $$ \begin{align*} \ce{2 P + 5 HClO + 3 H2O &-> 2 H3PO4 + 5 HCl} \\ \ce{Zn + 2 HCl &-> ZnCl2 + H2}...
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How to determine an oxidation number of an atom in the compound, that has at least two elements, which are not hydrogen or oxygen?

Wiki says: [Oxidation state] is defined as the charge an atom might be imagined to have when electrons are counted according to an agreed-upon set of rules: The oxidation state of a free ...

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