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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How to predict which complex is formed and which are soluble?

How does one come to know (in this table) which metal cations form ammonia complexes and which ones form hydroxy complexes on reaction with $\ce{NH4OH}$ Reference: J.D Lee - Concise Inorganic ...
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Manganese oxide reacts with tin(IV) hydroxide?

I have a problem on my chemistry summer homework in which it asks me to predict the product of “solid Manganese-Oxide when it reacts with tin(IV)-hydroxide in aqueous solution”. My issue is that there ...
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How do orbitals overlap in difluorosilane? [closed]

In $\ce{SiH2F2}$ four orbitals of silicon $(\mathrm{3s},$ $\mathrm{3p}_x,$ $\mathrm{3p}_y,$ $\mathrm{3p}_z)$ overlap with two hydrogen $(\mathrm{1s})$ and two fluorine $(\mathrm{2p}).$ I want to know ...
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Help with determining concentration of magnesium hydroxide for a specific pH level

This seems like such an obvious and elementary-level question for someone who has taken high school chemistry, but yet I'm having a difficult time solving it. I need to find the right amount of $\ce{...
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What is the correct electronic configuration of darmstadtium (Ds; Z = 110)?

Some of the places, the electronic configuration of darmstadtium ($\ce{Ds}$) is given as $\mathrm{6d^9 7s^1}$ while at some other places, it is $\mathrm{6d^8 7s^2}$. WHICH AMONG THE TWO IS CORRECT?
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Can there still exist equilibrium with a very high equilibrium constant?

Problem Consider the reaction translated by: $$\ce{2 CO(g) + O2(g) <=> 2 CO2(g)} \quad K_c = 2 \times 10^{22}~\text{at } \pu{1000 K}$$ The order of magnitude of the equilibrium constant, $K_c$,...
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Electron defficient molecules

Electron defficiency is a common feature in some class of compounds of Group 13 elements (B,Al,Ga). In some covalent compounds of Be too the same nature prevails. To compansate this electron ...
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Use of cryolite and fluorspar in electrolytic reduction of pure alumina by Hall-Héroult process

Cryolite $\ce{(Na3AlF6)}$ and fluorspar $\ce{(CaF2)}$ are added to alumina to lower the temperature of the mixture from $\pu{2000 °C}$ to about $\pu{900 °C}$ and also to increase the conductance. But ...
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Reactants used for manufacturing of mustard gas [closed]

A compound 'X' which is used in manufacture of mustard gas reacts with (ozone) $\ce{NH4Cl}$ to form 'Y' and elemental sulfur ($\ce{S}$). The compound 'Y' reacts with $\ce{NaOH}$ and $\ce{Ag}$ in ...
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Determining Oxidation Number [closed]

In NH3, what's the oxidation number of H? Should it be +3 or +1? I'm a little confused what to use.
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Order of reaction for hydrogen ions being ignored

I have been reading through a case study about calculating the order of reaction for the following reaction: $$\ce{H2O2 + 3 I- + 2 H+ -> I3- + 2 H2O}$$ The paper uses an iodine clock reaction ...
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Why does a first order reaction only depend on the concentration of a single reactant?

I am new to kinetics so please explain it from basic, If there is a reaction - $$\ce{A + B + C -> D}$$ In first order reaction rate is given by- $\mathrm R = k[\mathrm A]$ or $\mathrm R = k[\...
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Conversion of Erythrosine to Fluorescein

I am a home-chemist and I love dyes. I recently got my hands on sodium salt of erythrosine (tetra-iodinated fluorescein). I want to convert erythrosine to fluorescein. I speculate that using dilute ...
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What exactly is formed when K2Cr2O7 is reduced?

I read on Wikipedia and in many books that when $\ce{K2Cr2O7}$ is reduced, it forms $\ce{Cr^3+}$ and a change is noticed from orange color to green. I want to know in what exact complex/salt/compound $...
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Thermal Decomposition of Sulfur Hexafluoride

What is the thermal decomposition temperature for $\ce{SF6}?$ I've heard it decomposes into $\ce{F2}$ and $\ce{SF4}$ only to decompose further into $\ce{S2}$ and $\ce{F2},$ but I haven't found much on ...
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What is the CNC bond angle in methyl isothiocyanate?

According to VSEPR theory, for $\mathrm{sp^2}$ hybridisation the bond angle is approximately $120^\circ$. In $\ce{H3CNCS}$, the nitrogen has one lone pair. As lone-pair-bond-pair repulsion is greater ...
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Extract iodine from tincture? [duplicate]

What I am trying to do is extract elemental iodine from iodine tincture - that is 5% iodine solution in aqueous ethanol with $\ce{KI}$ as "helper additive", or whatever you'd call it. I don'...
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How to predict the reason for color in a transition metal complex? [duplicate]

I know about two reasons for the color of transition metal complexes that are dd transition and charge transfer phenomenon but I am confused when a complex can show both of the above-mentioned ...
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How to produce Acetylene or Ethylene for Artificial Fruit Ripening in Sachets? Without calcium carbide [closed]

Please advise what chemicals (powder + salts) can produce Ethylene or Acetylene Gas for Artificial Ripening of fruits in packed fruit boxes?
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Predicting Ka/Kb values using values for solubility in water

Given that $K_\mathrm{a}$ values are determined by the position of equilibrium for a species such as $\ce{HCl}$ where $K_\mathrm{a} = \ce{\frac{{[H^{+}]}{[Cl^{-}]}}{[HCl]}}$, I was wondering whether ...
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What is the shape of [Cr(NO)₄]?

I was learning about crystal field theory recently. I am quite confused about predicting the shape of $\ce{[Cr(NO)4]}$ complex because I am not able to conclude whether it will be square planar or ...
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Why the formation of PH4+ is difficult compared to NH4+? [duplicate]

My textbook asks this as an objective question. What I had in mind was that the lone pair on phosporous was more distributed as compared to nitrogen(since nitrogen is more electronegative and smaller ...
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what happens to the intramolecular bonds within water molecule during phase changes? [closed]

Does intramolecular bonds within water molecule change during phase changes?
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Lewis Structure of OF+

Would the Lewis Structure for OF+ be drawn so that the more electronegative atom has the more negative formal charge, or would it be drawn to satisfy the octet rule? Here are my thoughts thus far: ...
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Separating Silica from silicates [closed]

Does anyone know how one could extract Silica $\ce{SiO2}$ from a one or more of the following compounds in either ground or powder forms? Plagioclase: $\ce{Ca2Al2Si2O8}$ Pyroxene: $\ce{(Ca,Mg,Fe)...
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What does spontaneous mean in term of forward and reverse reactions?

I just learnt about Gibb's Free Energy and was thinking about an exothermic reaction with a negative change in entropy. This means that the reaction would occur at low temperatures. But that means ...
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Which “exotic salt” can lower water's freezing point by 70 °C?

The Medium.com article Mars Phoenix Lander, 10 Years Later shows several remarkable images and discoveries on Mars by the Mars Phoenix Lander circa 2008. One image (shown below) shows what looks like ...
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Which is more basic, hydrazine or ammonia?

Which of the following will be more basic, hydrazine $\ce{H2N-NH2}$ or ammonia $\ce{NH3}$? My chemistry teacher said that $\ce{NH3}$ is more basic since after giving $\ce{H+}$ to hydrazine results in ...
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Why does mercury decolourise a gold ring?

I saw that a gold ring decolourised as it got in contact with mercury . Why does this happen ? Is there any way to reverse this?
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What is the magnetic moment of tris(oxalato)nickelate(IV)?

I'm really struggling with finding the magnetic moment of this complex: In the solutions, it says that it is 2.83 BM (which corresponds to 2 unpaired electrons). However, in drawing out the d orbital ...
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Supposed low temperature of calcium carbide synthesis

I came across an interesting reaction on allreactions.com under silicon tab: $$\ce{SiO2 + 5 C(coke) + CaO ->[\pu{800–1000 °C}] Si + CaC2 + 3 CO}$$ Unfortunately the website doesn't provide sources ...
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Concentrating sulfuric acid

Since calcium oxalate is 3000 times less soluble than calcium sulfate, would it be possible to concentrate sulfuric acid from let's say $\pu{50\%}$ solution using following steps? : adding calcium ...
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Problem with synthesis of calcium formate

I just tried preparing calcium formate by adding $\ce{Ca(OH)2}$ to ammonium formate, but I observed no bubble formation and no smell of ammonia. Why doesn't calcium hydroxide, being a strong base, ...
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why lawrencium is placed in f-block elements although its last electron enters in 6d-subshell?

The electronic configuration of lawrencium ($\ce{Lr}$) is $\mathrm{[Rn] 7s^2 5f^{14} 6d^1}$. As its last electron enters the $\mathrm{6d}$ sub shell, it should be a part of $\mathrm{d}$-block elements,...
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Multiday lab courses in classic chemistry [closed]

This time of the year I usually get some extra income I can use on interesting courses. Usually rescue or sport courses. However, I also have a master degree in chemistry, and would like to spend some ...
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Why is there no effective alternative to metal salts in antiperspirants?

Metal salts, especially aluminum compounds are used in antiperspirants to prevent sweating. I found out aluminum chloride hexahydrate, which is found in most antiperspirants, undergoes an acid-base ...
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Why does nital need alcohol when etching metals?

I was reading about HNO3 and I saw it can be mixed with alcohol to form "nital", which is useful when etching metals, especially carbon steel. I wonder why alcohol is needed? HNO3 itself is ...
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How to write the formula of a mixed metal salt?

I suppose the formula of the Sulphate salt of Sodium & Potassium is $\ce{KNaSO4}$ as the Pubchem site says so. So, is there any rule that in the formulae such mixed metal salts we need to write ...
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Why doesn't graphite dissolve in organic solvent?

The graphene layers are held by weak van der Waals' force, this should be comparable to the force holding solvent particles. Why doesn't graphite dissolve in organic solvent and separate into graphene ...
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Characteristics of chemical reactions [closed]

Characteristics of chemical reactions are certain characteristics that tell us whether a chemical reaction has occurred or not. Some important characteristics of chemical reactions are given below : ...
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Can NaOH and NaH2PO2 exist together in aqueous solution?

Can $\ce{NaOH}$ and $\ce{NaH2PO2}$ exist together in aqueous solution? My textbook denies it, but I feel that since $\ce{NaH2PO2}$ is acidic, it should react with $\ce{NaOH}$, because in my textbook ...
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molecular orbital theory explaining molecular orbitals [closed]

i am a high school student,,and i am confused in molecular orbital theory,,,my confusion is that how bonding and non bonding orbitals are formed at the same time my teacher taught me that the two wave ...
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Lewis acidity order of Aluminum Halides [closed]

There is a similar question already on StackExchange which was not satisfactorily answered. So I am asking it again. I am unable to find this information in any book. Link to the other question: ...
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Why is sodium carbonate less soluble in water than sodium bicarbonate?

Why is sodium carbonate less soluble in water than sodium bicarbonate? If you think about their structures, the only thing that is different is that sodium carbonate has two sodium atoms, while sodium ...
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How do ions conduct electricity? [closed]

I mean to ask what do ions actually do while conducting electricity? Do they simply take up the electrons and transport it? If it is so, I do not understand how anions can take up more electrons if ...
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Is there any actual reaction between ferric chloride and CO2 gas?

I want to make Ferrous carbonates with Ferric chloride using $\ce{CO2}$. Does it even react with $\ce{CO2}$? how to know if it reacts to form $\ce{FeCO3}$?
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Why does barium sulphate not dissolve in HCl while barium sulphite does?

Intuition tells me that the ionic bond in the sulphate must be stronger than that in the sulphite. Is this true? If it is then why? The charge on the barium ion is 2+ in both cases and the charge on ...
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Exothermic dissolution

When I was learning about salts that show exothermic dissolution, I noticed that the same salts used in Daniel Cell( due to similarity of size of anion and cation) were undergoing exothermic ...
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How to recognize Barium sulphite?

Yes it's a white ppt. which is soluble in dil. $\ce{HCl}$, but I'm not sure which of the following happens: $$\ce{BaSO3 +$dil.$HCl->Ba(HSO)3 +Cl-}\tag1$$ $$\ce{BaSO3 +2H+->Ba^2+ +SO2 ^ +H2O}\...
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Why does CCl4 not undergo hydrolysis while other chlorine-derivatives of methane do?

In one of my textbooks, I came across a question as to why does $\ce{CCl4}$ not undergo hydrolysis. The answer given went along the lines of carbon lacking a vacant d-orbital to accept the lone pair ...

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