Podcast #128: We chat with Kent C Dodds about why he loves React and discuss what life was like in the dark days before Git. Listen now.

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.

Filter by
Sorted by
Tagged with
-2
votes
3answers
1k views

Oxidation State Of Propene

I was just trying to understand the oxidation states of organic compounds. A more electronegative atom than carbon increases it's oxidation state by 1 and less electronegaitve atom decreases it's ...
1
vote
0answers
62 views

Why are oxidation states such a fundamental quantity for elements?

Why is it that there are fixed oxidation states for most elements out there, with no to very rare exceptions? I was taught that oxidation state is a totally artificial concept we have invented for ...
-1
votes
1answer
255 views

Oxidation state of Cu

If copper has 1 valence electron in the 4s subshell, how is it able to form Cu2+ with oxidation state of 2? I know the energy level difference between the 3d and 4s subshells has a part to play here, ...
-2
votes
1answer
124 views

Using the Nernst equation with a gaseous reactant/product

I have a question about using the Nernst equation. $E = E^\varnothing + (0.059/n)(\log\frac{[Ox]}{[Red]})$ Specifically, I am interested in the reaction of $\ce{MnO4-}$ and $\ce{C2O4^2-}$ below: $$\...
0
votes
1answer
562 views

Why does iodine get oxidized to iodic acid and not periodic acid by nitric acid?

Nitric acid oxidizes iodine to iodic acid, $\ce{HIO3}$ and not periodic acid, $\ce{HIO4}$, which is of a higher oxidation state. This happens although other nonmetals are oxidized to their highest ...
19
votes
1answer
1k views

An introduction to “oxidation state”/“oxidation number”

I just can't get my head around oxidation states. They're really confusing! Why do I need to assign a number to some element? What are oxidation states? How and why should we assign oxidation states? ...
1
vote
0answers
126 views

Periodic trends on half cell potentials

In a practice examination that I'm using to study for my upcoming midterm, one of the questions asks to choose three elements from a row of the periodic table and to give the order of the increasing ...
1
vote
1answer
379 views

Why is thallium(III) oxide stable while thallium(III) chloride unstable

Why is thallium(III) oxide stable while thallium(III) chloride unstable Both the compounds have +3 oxidation state of thallium and the electronegativity difference between chlorine and oxygen ...
3
votes
1answer
1k views

Oxidation state of Halogens

So the question is which is the most common oxidation state of halogens and I have to justify my answer. Is my following thought correct? Do I have to add something? The most common oxidation state ...
0
votes
1answer
75 views

What is the proof for saying all the compounds-of-an-element (except few), to have the same oxidation number?

Following statements are extracted from Puri, Sharma, and Kalia's Principles Of Inorganic Chemistry book: In all hydrogen compounds (except hydrides of active metals), the oxidation number of ...
0
votes
3answers
2k views

Charge on Nitrogen in NCl3

What is the charge on $\ce{N}$ in $\ce{NCl3}$? I want to know if it is positive or negative. I feel it should be positive but I am not sure.
3
votes
0answers
86 views

Colour change on exposure to singlet oxygen?

Is there a dye that is particularly well suited to radical colour change on interaction with singlet oxygen, preferably non-toxic? Based on this answer: https://chemistry.stackexchange.com/a/27633/...
6
votes
2answers
8k views

What is the oxidation state of sulphur in sulphur dioxide?

So for $\ce{SO2}$, here's the solution when finding for the oxidation number of sulfur. $$x + 2(-2) = 0 \\ x - 4 = 0 \\ x = +4$$ $x$ here would be the oxidation number of sulfur, so the compound ...
3
votes
1answer
344 views

Why are electrons shared equally when calculating formal charge, but unequally when calculating oxidation state?

When calculating formal charge - electrons are shared equally between the atoms in the bond. When calculating oxidation state - electrons are both given to the most electronegative atom. Why is this ...
2
votes
2answers
19k views

Reaction of white phosphorus with aqueous sodium hydroxide

What are the products obtained in the reaction of white phosphorus with aqueous sodium hydroxide? I know one will be phosphine ($\ce{PH3}$). How can we find the oxidation state of phosphorus in the ...
-2
votes
2answers
2k views

The teacher insists that iodine oxidation number in iodate ion is 7

What started as this question http://chemistry.stackexchange.com/questions/67756/is-it-possible-to-use-the-school-supplied-algorithm-to-build-the-lewis-diagram-o continued with an email from the ...
4
votes
2answers
4k views

Why do heavier transition metals show higher oxidation states?

In p-block elements, higher oxidation states are less stable down the group due to the inert pair effect. This is not the case for transition metals. Why do heavier transition metals show higher ...
1
vote
1answer
69 views

Identifying the oxygen atoms that undergo reduction

Identify the oxygen atoms that undergo reduction in the reaction below: $$\ce{O2 + Cr^3+ -> H2O2 + Cr2O7^2-}$$ I know that the oxygen atoms in $\ce{O2}$ have an oxidation state of $0$. In ...
2
votes
2answers
2k views

experimentally determine oxidation state of Iron compound

I need to make several Iron compounds but I am having a bit of trouble finding a decent way to determine the oxidation state of Iron. I'm starting with a Iron(II) compound that I try to oxidize using ...
1
vote
0answers
3k views

Why in molybdenum disulfide the oxidation state of Mo is IV?

On one hand, stoichiometrically, it makes sense that in $\ce{MoS2}$ the $\ce{Mo}$ would have +4 and each sulfur would have -2. (source) However, in reality, every $\ce{Mo}$ atom is bonded to 6 ...
3
votes
1answer
255 views

What does it mean “A oxidizes on B”

I have just managed to understand the difference between oxidation and reduction. So basically if A oxidises B, then B loses electrons, right? But what does this formulation mean: "A is oxidized on B"?...
0
votes
1answer
237 views

How to calculate the amount of aluminium that has been oxidised?

I have a sample of pure aluminium (100%), 1 kg, stored in "normal condition" After some time the weight of sample has increased by 1%. I assume that aluminium has oxidized to $\ce{Al2O3}$ I know the ...
1
vote
1answer
620 views

What is a highest oxide of element?

When I go through oxides of period 3 elements in periodic table I came across a term "highest oxides" and when I searched I didn't found any appreciative answer for my question. What are highest ...
8
votes
2answers
1k views

Oxidation state of tungsten in W3O8

Recently I came across this equation: $$\ce{WO_3 +SnCl_2 +HCl\rightarrow W_3O_8 + H_2SnCl_6 +H_2O}$$ The compound $\ce{W_3O_8}$ that appears in the right hand side of the equation seems to be mixed ...
0
votes
1answer
2k views

Reducing property of alkali metals [duplicate]

In my book it is given Reducing property increases down the group in gaseous or molten state . The increasing order is Li , Na , K , Rb ,Cs In according to me reducing property is based on ...
1
vote
1answer
289 views

Oxidation Number

What does Oxidation number actually signify? If it means the number of electrons gained or accepted, why is it a fraction in some cases like in super oxides?
1
vote
1answer
1k views

Difference between valency and oxidation state

I know the abstract and sketchy obscure differences but I cannot find anywhere the specific comparison between the concepts of oxidation states and valency including how they are used to describe ...
0
votes
1answer
3k views

Which occurs first: nitration or oxidation of aniline by concentrated nitric acid?

Which of the cases is possible or both or none?
-2
votes
1answer
6k views

How to find the oxidation state of complexes with bridging ligands? [closed]

How can I find the oxidation states of $\ce{Fe, OH-, NH2-}$ in the given complex?
1
vote
1answer
129 views

Something I don't understand about batteries

someone explained how a zinc copper battery works but there's already something I don't understand in the beginning. Here is the reaction this person said happens in the battery $$\ce{Zn + Cu^2+ -&...
8
votes
2answers
505 views

Oxidation state of hydrogen in the LaNi5H intermetallic

This question is from an introductory chemistry course: What is the oxidation state of $\ce{H}$ in $\ce{NaH}$, $\ce{HCl}$, and $\ce{LaNi5H}$? I've looked in the textbook to no avail. Google ...
1
vote
1answer
165 views

Oxidation number vs charge?

From what I understand: *oxidation numbers: are the "act" of electrons moving while *charge: is what the atom "wants" to do with its electrons. - Can anyone please clear up the distinction ...
3
votes
1answer
653 views

Oxidation numbers of atoms in Ti(SeO3)2?

What are the oxidation numbers of atoms in $\ce{Ti(SeO3)2}$? I'm having trouble figuring this out since I don't know the charge for either $\ce{Ti}$ or $\ce{Se}$.
1
vote
1answer
613 views

Difficulty understanding redox in terms of hydrogen and oxygen transfer?

I have come across 4 ways of defining oxidation: loss of electrons increase in oxidation number gain of oxygen loss of hydrogen From these definitions, I have an idea of what I think 'oxidation' and ...
1
vote
0answers
43 views

Saline removing rust from counter?

Background (pointform for readability): I prepack oral medication for a hospital. Our work area consists of a long stainless steel countertop. We use plastic bins to transport the medication around ...
12
votes
2answers
5k views

Does fluorine in FNO3 have +1 oxidation number?

According to my textbook and also Wikipedia, fluorine nitrate is a compound which can be created (though it is unstable). Also my textbook says that fluorine has a $+1$ oxidation state. But how is $+1$...
5
votes
1answer
96 views

I suspended iodine over steel nails. What are these droplets that formed?

I suspended about 15g of iodine crystals over a couple of nails to see how quickly they would begin to rust. After a week, these droplets had formed. When prodded they broke apart like water drops. ...
-2
votes
1answer
4k views

In a combustion reaction, why is carbon in methane oxidised even though it starts and finishes with 8 electrons?

In $\ce{CH4}$, carbon has 8 electrons due to 4 covalent bonds. In $\ce{CO2}$, carbon has 8 electrons due to 2 double bonds. In both cases, carbon has 8 electrons. So why is carbon oxidised? Doesn't ...
1
vote
0answers
389 views

Why do osmium and iridium have the most oxidation states of all the elements?

Both osmium and iridium have 12 oxidation states. Indeed, iridium has the highest oxidation state of all elements at +9. see https://en.wikipedia.org/wiki/List_of_oxidation_states_of_the_elements I'...
0
votes
2answers
182 views

Meaning of charges in a group?

In my class, my professor said that since hydrogen is in group one, it has a charge of 1+. Does this refer to its ionic charge or to its oxidation state?
25
votes
9answers
6k views

What are oxidation states used for?

When I took high school chemistry many years ago, considerable effort was spent on teaching us to compute oxidation states of atoms in various compounds, following a set of rules that looked somewhat ...
0
votes
1answer
378 views

Clarification on Oxidation Number and Ionic Charge

I am confused on the differentiation between ionic charge and oxidation number (state). For example and simplicity, $\ce{NaCl}$ is an ionic compound so it forms $\ce{Na+}$ and $\ce{Cl-}$. Are these (...
1
vote
3answers
9k views

Oxidation states of oxygen

I'm given a question: Oxidation number of $\ce{O}$ in $\ce{BaO2}$ is $x$ and in $\ce{OF2}$ is $y$; then the value of $x+y$ is what? Now my main question is that if $\ce{F}$ has $-1$ valency in $...
0
votes
0answers
37 views

Why is potassium permanganate coloured? [duplicate]

$\ce{Mn}$ in $\ce{KMnO4}$ is in $+7$ oxidation state, has no d electrons so d-d transition is not possible. Then, how is $\ce{KMnO4}$ coloured?
2
votes
0answers
128 views

Identifying an unknown white oxidizing powder

I am working with a unknown white oxidizing powder that melts at around 500 degrees Fahrenheit. It turns my finger green when it comes into contact with my finger for a short while. It leaves a very ...
-3
votes
3answers
7k views

Elements with multiple oxidation states

I downloaded a periodic table app which gives detailed information for each element. The app shows some elements, however, have two different oxidation states. Hydrogen, for instance, can have either ...
2
votes
1answer
68 views

How will metallic lithium react with atomic oxygen?

Very high in Earth's atmosphere, there's a lot more atomic oxygen than anything else. Although I'm sure the energies involved in keeping oxygen in this state are an important variable, I'm interested (...
1
vote
1answer
300 views

Which it is the oxidation state of indium and phosphorus? [closed]

I would like to know what the oxidation state of indium and phosphorus in a structure type rock salt. It could be +1 and -1? Yes or not? and why? Thanks
-2
votes
1answer
7k views

Group of Potassium and It's Oxidation Number

One of the questions I got wrong on a chemistry Kahoot question was (1) Potassium is in group $1$, what is its oxidation number? (a) -1 (b) +1 (c) +2 (d) -2 I don't remember what an "oxidation ...
0
votes
1answer
1k views

Anomalous oxidation states of Transition Metals

I have noted down the available positive oxidation states of the first row of transition elements (on the Periodic Table) from the respective Wikipedia articles of the elements. $\ce{Sc} - 3, ...