Questions tagged [inorganic-chemistry]

Inorganic compounds generally do not have C-H bonds, while organic compounds do have such bonds. The distinction between inorganic and organic chemistry, however, is far from absolute.

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Solution of metals in liquid ammonia [duplicate]

What is the colour of the solution obtained by dissolving alkaline earth metals in liquid ammonia ? Some sources (like jd lee) says it is bright blue but some other say black blue. I know it is blue ...
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Does UV and Visible Light affects the Core electron, Valence electron, or Both?

When exposed in UV or Visible Light radiation, matter is induced to perform electronic excitation. Is the electron that excites, a core electron, a valence electron or can they both be excited? ...
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Why is [Fe(CN)6]3- more stable then [Fe(ox)3]3- despite being a non-chelate?

I was reading up on how chelation leads to more stability of a complex, and then I came across this weird trend given by my professor in class as a contradiction, with no explanation. I'm curious what ...
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Methyl Radical. Lewis Acid or Not?

Is methyl radical a lewis acid ? According to me it is a lewis acid as any species can be considered as a lewis acid if it can accept an electron in its LUMO.
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Using a weak acid to prevent the precipitation of Mg(OH)2

I have this exercise in my chemistry book, and I have been staring at it for so long but unfortunately I have no single idea what to do and where to start. I will be so thankful for any help. $0.05$ ...
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87 views

Which is more acidic HOF or HOCl?

My attempt to the question: We know that more polar the $\ce{O-H}$ bond, the more acidic is the compound. According to electronegativity, the $\ce{O-H}$ bond of $\ce{HOF}$ should be more polar than $\...
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29 views

Exact weights for a chemical reaction og Silver and Nitric Acid [closed]

I'm an amateur analog photographer and want to react Nitric Acid (62%) and silver to Silver nitrate. Silver nitrate is the basis for almost all black and white photography. I'm trying to figure out ...
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1answer
36 views

Bond energy in hydrogen [closed]

Why is hydrogen-hydrogen bond the strongest of all single bonded compounds? The bond energy principle here is based on the stability of atom after bonding, so even other atoms, when they combine with ...
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69 views

Reaction of sulphur with calcium carbonate

Can sulphur react with calcium carbonate to form sulphur trioxide and calcium carbide, as the energy of 3(S=O) is greater than ((C=O) +2(C-O))? EDIT: i forgot to say that this is in an oxygen-free ...
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Equilibrium Constant dependence

The equilibrium constant (EC) of a certain reaction is only dependent on temperature. For instance, suppose at a certain temperature, the EC of $\ce{A + 3B <=> 2C}$ is $K$. Now if I divide the ...
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How can we find out the type of bonding present in a compound or a molecule?

For example, if the bonding in diamond, ice, MgO or CO2 is to determine, how can I find it out? How to determine van der Waals forces?
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Formal Charge in Coordinate covalent bonds [closed]

I am in an honors chemistry course right now and I would like to know the formal charges of the atoms in CO, my confusion is that because the bond is partially coordinate covalent, are the bonded ...
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68 views

Method for removing CuO in an inert environment

Common oxides (i.e., CuO or Al2O3) are capable of removal via NaOH solution. However, I am interested in removing a copper oxide layer inside an inert (Ar glovebox) environment. Thus, the traditional ...
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124 views

Hydrogen peroxide and glycerol combination

Is the mixing of store-grade hydrogen peroxide 3% and glycerol in the ratio of 1:2 (V/V) at room temperature affecting the decomposition rate of hydrogen peroxide?
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626 views

Thermal stability order of NaF, MgF2 and AlF3

I came up with a question to arrange thermal stability order of $\ce{NaF}$, $\ce{MgF2}$ and $\ce{AlF3}$ and I think the answer is $\ce{NaF>MgF2>AlF3}$ because $\ce{Na+}$ has largest ionic radius ...
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1answer
54 views

Why does ionisation energy to remove electrons from the same subshell increases? [closed]

Electrons in the same subshell possesses the same energy. So why does ionisation energy to remove electrons from the same subshell increases? For example, $\mathrm{2s^2}$ has two electrons. Since ...
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1answer
100 views

Stability of Arsenic Pentafluoride [closed]

How is the above mentioned compound stable enough to occur naturally? Also, I've read that it's a covalent compound with a Trigonal Bipyramidal Structure. The Arsenic atom is $sp^3d$ hybridized. ...
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81 views

What gas is released when heating sulphuric acid? [duplicate]

I'm doing a chemistry project and am really unsure about the gas released when heating sulphuric acid.
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1answer
52 views

How to identify whether a metal carbonate is basic or not? [closed]

Magnesium carbonate is basic, but why isn't lithium carbonate also basic? And how does one determine whether a carbonate is basic or not?
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195 views

Why is it important in the iodine clock reaction that there is only a small quantity of sodium thiosulfate?

These are 2 questions . Why is thiosulphate needed ? And why In small quantities ? I know that the thiosulphate reacts with the I2 to form I ions Why is that important though ?
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360 views

What is PPM in terms of air concentration?

When they say the $\ce{CO2}$ concentration is $\pu{350 ppm}$ what does this actually mean? Does this mean that if we took a sample of air say $\pu{1 m3}$ then $\pu{350 mg}$ of that cubic meter would ...
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1answer
181 views

How can I find the equilibrium constant Kp without temperature?

The question I'm looking at is I found that that Kc = 139M^-1, but how can I determine Kp? There is no temperature given, but I was told that it is still possible to calculate.
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108 views

What is the entropy of Cu(NO3)2?

I have searched for the entropy of copper nitrate in various tables across the internet* and all I could find was its Hf. Ullmann also didn't give an any better clue. If it was not measured and ...
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1answer
29 views

Help understanding the equation for Spin Energy in Zero Field

I’m working with a system that experiences spin frustration and for me this is the first time dealing with such a phenomenon. To grasp the concept, I’ve decided to go to the basics and read the ...
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60 views

Etching of ZnS crystal by NaOCl

Can someone tell me the exact mechanism for etching $\ce{ZnS}$ with $\ce{NaOCl}$? I believe it is due to $\ce{OCl-}$ ion, just need confirmation. Many thanks.
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347 views

Does hydrogen peroxide in basic medium only give oxygen gas on oxidation?

Does hydrogen peroxide on oxidation gives oxygen gas only in basic medium? I thought that was true but I read about these reaction of $\ce{H2O2}$ in acidic medium: $$\ce{2MnO4- + 6H+ + 5H2O2 -> ...
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What is (if there is) the reaction between manganese chloride and oxygen when dry?

I had a chemistry lab and I did a error. I was supposed to make some $\ce{MnCl2}$ and then used fire to dry it but then some of it turned black, and I am supposed to quantify my error. So I am ...
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277 views

Why potassium chromate can be used as indicator in Mohr method?

Both silver chloride and silver chromate are insoluble, so why is that silver chromate is precipitated before silver chromate? Why wouldn't both red silver chromate and white silver chloride form at ...
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Difference in bonding between water and hydroxides [duplicate]

As we know, water is a covalently bonded molecule. However, the hydroxides - such as sodium hydroxide - are ionic compounds. Both of these are similar, although the difference between both is a sodium ...
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2answers
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Slaked lime: Why does calcium hydroxide have to be used in conjunction with sodium hydroxide? Why can't it be used alone? [closed]

To absorb carbon dioxide. I haven't been able to find an answer to the above anywhere.
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1answer
126 views

Electron Affinity negative? [duplicate]

Why is electron affinity negative? An electron carries energy so if we had an electron doesnt that mean we add energy? Please describe in a non-PhD lingo that a first semester chem student can ...
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157 views

Reaction between aluminum oxide and SO3 in anhydrous environment

I am aware of amphoteric properties of aluminum oxide and that it can react with both strong acids and bases. I was recently asked a question whether amphoteric properties allow for reaction with ...
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1answer
364 views

Make KCN from ferrocyanide, K2CO3, and carbon

$$\ce{2K4Fe(CN)6 + 2K2CO3 + 1C -> 12KCN + 2Fe + 3CO2}$$ This reaction seems very logical. Does it actually occur? What temperature should be used for the reaction? $\pu{640^\circ C}$?
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Why is the repulsion between lone pairs and bonded pairs stronger than the repulsion between the bonding pairs and the bonding pairs? [duplicate]

My book says "The reason for this difference is that the electron pair in a bond is further from the nucleus of the central atom than the electron pair in a lone pair." I don't get it , how does the ...
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2answers
986 views

Lab Methods for Determination of Phosphoric Acid Concentration

Dear stack exchange, For my next lab session we have been tasked to come up with two different methods for determining the concentration of an unknown sample of phosphoric acid. Design at least ...
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1answer
46 views

Balancing other atoms in a redox reaction using half reaction method

I have this balanced redox reaction: $$\ce{2H2O + 8Al + 3NaNO3 + 5NaOH -> 3NH3 + 8NaAlO2}$$ I think its unbalanced form should be (I guess water added to balanced it) $$\ce{Al + NaNO3 + NaOH -> ...
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Half-Filled Shells and Stability explanation [duplicate]

I am reading a book about Advanced Chemistry, and it is discussing the subject of half-filled orbitals. The book notes that Chromium has an electron structure of $1s^2 2s^2 2p^63s^23p^63d^54s^1$ ...
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making sulfuric acid from pyrite

I recently found a place with an insane amount of pyrite (we are talking about tons) already smashed into smaller pieces, and I'm wondering if there is any way of converting it into sulfuric acid. I'...
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The preparation of 0.005 M Iodine Solution

The dissolution of iodine crystals with potassium iodide is very slow. To prepare a 0.005 M Iodine solution will require you keep the vessel until all crystals dissolve. With the low concentration and ...
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Ions Na+ and Cl-

Fundamental question on ions: If, for instance, $\ce{Na}$ and $\ce{Cl}$ react to produce $\ce{NaCl}$ salt, then $\ce{Na^+}$ and $\ce{Cl^-}$ are obviously formed. What I don't understand is, for ...
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Why does Sulfur have 12 valence electrons in the Sulfate ion? [duplicate]

So I am completely and utterly confused about why sulfur has 12 valence electrons. I understand in it's configuration, it has 2 electrons for the 3s subshell, and 4 electrons from its 3p subshell, and ...
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1answer
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Stability order of Cr2+ ,Mn2+ , Fe2+ ,Co2+ [closed]

Stability order is given as $\ce{Mn^2+ > Fe^2+ > Cr^2+> Co^2+}$ Of course I know that $\ce{Mn^2+}$ is the most stable form as it has half filled degenerate orbitals. But my query is ...
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1answer
68 views

Molecular Geometry [duplicate]

Why is it that for a molecule with trigonal bipyramidal geometry, the lone pair is located in the equatorial region whereas for a molecular with an octahedral geometry, the lone pair is located in the ...
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1answer
275 views

Is it possible to calculate the Kc for an irreversible reaction? [closed]

Is it possible to calculate the Kc for an irreversible reaction? For instance, can we Calculate the $K_c$ for: $$\ce{NaCl + AgNO3 -> NaNO3 + AgCl}$$
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Why atomic mass is taken in comparison?

The definition of atomic mass says that it is the mass of one atom of the element with respect to 1|12 of the mass of carbon-12 atom. My question is that why there is need to compare the atomic mass ...
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Determine concentration of phosphate after copper(II) oxalate is precipitated

Solution with $\ce{Na3PO4}$ with $\pu{0.02 M}$ concentration and $\ce{Na2C2O4}$ with $\pu{0.03 M}$ concentration. I add excess $\ce{Cu(NO3)2}$ very carefully – tiny amounts. What will be my $\ce{PO4^...
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320 views

electron counting for transition metal-oxo ligand compound

Using donor-pair method, how many electrons would an oxo ($O^{2-}$) ligand contribute? I cannot decide if it is 2 or 4.
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Confusion in n-factor calculation

How do we calculate the equivalent weight of a compound, in a case where certain fraction of an element of the compound is getting reduced, while the other fraction is unaffected (no change in ...
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2answers
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Why is bismuthine (BiH3, or bismuth trihydride) unstable if bismuth is considered to be the most stable heavy element?

Bismuth-209 is considered to be the most stable heavy element, though it is weakly radioactive. Given that, why does bismuthine ($\ce{BiH3}$, or bismuth trihydride) have a half-life of only 20 ...
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2answers
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Storage of Halogen [closed]

I learned that we should store Bromine in brown coating glass bottle. But, I heard that halogen liquid is so reactive that it can melt even glass. So, I want to know the practical storage method of ...