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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117 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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101 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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54 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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257 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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541 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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238 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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126 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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30 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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63 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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392 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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332 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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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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146 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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171 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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401 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
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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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71 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
320 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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80 views

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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108 views

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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345 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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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 ...
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1answer
614 views

Chlorine Fluoride, why not Fluorine Chloride

Why is Chlorine Fluoride called "Chlorine Fluoride" rather than "Fluorine Chloride"? As I was taught in school that normally that when nonmetal combine with nonmetal then we write the compound with ...
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3answers
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Particle-wave duality for atoms [closed]

Hmm Hello . I was wondering if we could apply the particle-wave duality of a subatomic particle for an entire atom.I know that atom is better described as space but could we apply the de Broglie ...
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72 views

Why are thermoluminescent materials mostly mostly based on calcium sulfate rather than on zinc sulfide or calcium fluoride?

I am doing a research in thermo-luminiscent topic and over a part of phosphor called calcium sulfate? The question my mentor asked to me is that why mostly people choose calcium sulfate to do research ...
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How can I learn Qualitative Analysis and all its equations? [closed]

Qualitative Analysis, as all may know, has so many equations and each element has its own specific properties - colour, reaction, test etc. How can I learn all this?
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estimation of copper iodometrically using sodium thiosulphate [closed]

What is the role of iodine here? And why only sodium thiosulphate is used for titration? Why do we add $\ce{Na2CO3}$ here. Also why do we add acetic acid here?
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Out of CaCO3 and MgCO3, which has higher electrical conductivity of molten solution? [closed]

According to me, Mg will be more hydrated and so should have lesser conductivity. Is that correct?
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64 views

What does FeCl2 mean? [closed]

I'm doing a lab for a class , and in the manual, they right the compound as Fe(Cl)$_2$. I looked up that compound, and it has a very high boiling point, but the compound during the lab was already in ...
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2answers
428 views

Magnesium oxide lab question [closed]

For my magnesium oxide lab, one of the question asks why I need to include the cover of the crucible when weighing it with the magnesium before the reaction, then again after with magnesium oxide, and ...
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1answer
566 views

Dissociation constant of solid ammonium chloride [closed]

When solid ammonium chloride dissociates at a certain temperature in a $\pu{0.500 dm3}$ container, ammonia and hydrogen chloride are formed. $$\ce{NH4Cl <=> NH3 + HCl}$$ The initial ...
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1answer
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Peroxide without hydrogen [closed]

How come we always see hydrogen peroxide and never peroxide by itself. Is there such a thing as peroxide ? Does this exist in nature? Why is hydrogen always associated with it? Please note: First ...
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1answer
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If copper is insoluble in excess NaOH, does it mean it is soluble in NaOH when not in excess? [closed]

I don't understand, does it mean when i add a little bit of NaOH, there will be completely no precipitate/ it will dissolve?
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How can one come to know how a catalyst affects a reaction when the reaction and the catalyst is known [closed]

How can I come to know how a catalyst affects a reaction when the reaction and the catalyst used is known. I searched the internet for an answer but could not find one.
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What is so special about Beryllium (Be) and Magnesium (Mg)? [closed]

I am asking this because after studying periodic properties and trends of elements I have come to an understanding that these two elements ($\ce{Be \& Mg}$) are many of the time exception to the ...
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Is neutralized and dried suphuric acid still a hazard? Is it still acidic to touch? [closed]

I mistakenly put a sulfuric acid drain cleaner in my bathroom sink. Some of it spilled into the bathroom in my basement. I cleaned it up using baking soda, but I'm concerned if I missed any, whether ...
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Why are the phase diagrams showing $G_s$ and $G_l$ situated so close on one end and then widens up at the other extremes? [closed]

With reference to the phase diagrams drawn in b and d why are the Gibbs phase lines coming closer from being so further apart?