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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Catalyzing the breakdown of Si-O bonds

What catalysts can catalyze the breakdown of (Si-O) bond ? Can you mention some books(ebooks or hard cover) or websites that cover a lot of information about (Si-O) bond characteristics? I have ...
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Oxidation number of nitrogen in KCN

How can one determine the oxidation number of nitrogen in $\ce{KCN}$?
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What ratio of bicarb to sugarcane juice with a pH level of 4.5-5.5 to neutralize pH level?

I am thinking of adding baking soda to sugarcane juice to eliminate the fruity acid that is present. The pH of sugarcane juice ranges from 4.5-5.5. I wonder how much baking soda should I incorporate ...
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34 views

How to predict whether a salt will act as an acid or as a base in aqueous medium?

How to would we know if a salt such as $\ce{CO_2}$ reacts acidic or basic in water. The explanation I see everywhere is that you have to see the acid and base that makes up the salt, in the case of $\...
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How Can I Induce Corrosion Electrochemically?

I'm very interested in measuring corrosion in metal alloys, particularly in salt solutions. I understand metals corrode over time, however, I was wondering if it's possible to electrochemically "speed ...
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1answer
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Flame Test: Why does the flame colour of calcium disappear quickly?

While performing flame tests for calcium fluoride and strontium fluoride, I observed strontium gives a long-lasting rose-red flame color but the brick red color for calcium quickly disappears. I also ...
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1answer
61 views

What would be the concentration of products in this calcium producing system?

I wanted to figure out a way to make calcium metal with potassium oxide. $\ce{K2O}$ undergoes disproportionation at $\pu{350-430 °C}:$ $$\ce{2 K2O -> K2O2 + 2 K}$$ Now, if I mixed in $\ce{CaO}$ (...
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Synthetic approach for precursor 1,1'-(bromomethylene)bis(1H-pyrazole) in ligand synthesis

Relevance During my Bachelor's project I focused on the synthesis of iron(II) complexes comprising a tetrapodal pentadentate ligand from the ligand family $\text{PY5R}_2\ (\text{R = H, Me, OH, OMe})$....
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How to balance a redox reaction [on hold]

How should the reaction between ozone and potassium iodide leading to formation of iodine and oxygen gases be balanced (through changes in oxidation states of substances)?
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Calculating bond dissociation enthalpy of F-F bond

$$\ce{N2 + 3 F2 -> 2 NF3} \quad ΔH = \pu{-263 kJ mol-1}$$ The bond dissociation enthalpies of the nitrogen triple bond and nitrogen–flourine bond are $\pu{946 kJ mol-1}$ and $\pu{272 kJ mol-1}....
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Structure and oxidation state of bridging complexes

I am confused about the structure of bridging complexes with the bridging ligands as $\ce{OH-}$ or $\ce{NH2-}.$ Aren't they both monodentate ligands? And if they form a simple coordinate bond, then ...
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Why anhydrous copper sulphate is acidic in nature but pentahydrate copper sulphate is amphoteric? [on hold]

$\ce{CuSO4}$ is acidic salt because it is made up of $\ce{Cu(OH)2}$ (weak base) and $\ce{H2SO4}$ (strong acid). But why $\ce{[CuSO4.4H2O]H2O}$ is amphoteric?
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Reaction of Lead(II) Chloride and Ammonia

While searching how to identify cations in a solution I found that ammonia could be used to distinguish between $\ce{AgCl}$ and $\ce{PbCl2}$ precipitates after $\ce{HCl}$ had been added. Why does ...
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1answer
52 views

Mixing cobalt(III) hydroxide and thallium(III) hydroxide

A simple question on solutions is driving me crazy. At this point, I think the textbook's wrong. Here's the question: A saturated solution of cobalt(III) hydroxide $(K_\mathrm{sp} = \pu{1.6e-44})$ ...
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Hibridization of any element [duplicate]

I need a guide to learn about all hibridization techniques. Suggestions like a book,pdf,site would help me a lot!
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1answer
40 views

Weathering steel

I'm building something out of weathering steel (A606). It is chemically formulated to rust until it becomes chemically stable and stops rusting. Its composition is: Carbon: 0.22%; Manganese: 1.25%; ...
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Find pH and concentrations of bicarbonate and carbonate in the rain droplet

The concentration of hydrogen ions in a rain droplet is $\pu{0.000141 M}.$ Calculate the $\mathrm{pH},$ the concentration of both bicarbonate and carbonate in the rain droplet by assuming that the ...
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How long does it take for H2O2 to dissociate inside water? [closed]

How long will it take a solution of 50mL 40% H2O2 to completely dissociate after being injected into a vessel containing 70L H2O (90% in the dark)? Temperature of H20 is 21C. I am doing this to kill ...
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Why decanted solution should be colorless when determining formula of unknown chloride?

I was following the guide “Stoichiometric Determination: Empirical Formula of Copper Chloride”. Under the Procedure section the following reaction is given: Producing solid $\ce{Cu}$ from a $\ce{Cu(...
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NH4NO3 + NaOH What is this weird floating precipitate?

In a reaction $\pu{110\\g}$ of $\ce{NaOH}$ and $\pu{90\\g}$ of $\ce{NH4NO3}$ are combined in approximately $\pu{500\\mL}$ of water. An unknown foam appeared. This foam however acts more like a ...
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What is the Charge on the NH3 molecules in Coordinate complex [on hold]

In a coordinate complex $\ce{[Co(NH3)3Cl3]}$ why ammonia will not have any charge like in $\ce{NH4+}$ in both cases $\ce{N}$ donated its lone pair to cation.
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2answers
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I can't find reaction enthalpy ∆H for water formation reaction

$$\ce{1/2 O2(g) + H2(g) → H2O (l)}$$ The tabulated value is $\Delta H = \pu{−285.8 kJ/mol}$ I'm using the bond energies values for each molecule and for some reason, I am getting a different result, ...
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1answer
648 views

Mechanism for Chromyl Chloride Formation

This is the very famous chromyl chloride test, used for detection of chloride ion in solution - $$\ce{K2Cr2O7 + 4NaCl + 6H2SO4 -> 2CrO2Cl2 + 2KHSO4 + 4NaHSO4 +3H2O}$$ When a mixture containing ...
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Testing thermite for chemical properties

I'm writing a movie in which a bunch of military explosive ordnance experts destroy a turbine with thermite and the local fire chief has to work out whether it is plain $\ce{Fe2O3}$ and aluminium ...
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Stability of Transition Metal Carbonyls [closed]

Inside a transition metal group does the thermodynamic / kinetic stability of carbonyl complexes increase or decrease? For example: Cr(CO)6 Mo(CO)6 W(CO)6
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Br- and I- ions give layer test, but Cl- ion doesn't. Why? [closed]

One of the questions I found in an NCERT book. Interestingly I could not find the answer anywhere on the internet. Hence, stack exchange.
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Stern_Volmer constant [closed]

I'm a master student of inorganic chemistry and my question is how can I get more information from quenching rate constant (Kq) is mentioned in chemical papers and is it possible to convert it into ...
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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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proper disposal of mixture [closed]

My name is Maher Elhinnawi working as director of incineration facility and I am looking forward for your help in proper disposal of a mixture containing below materials in my incinerator if yes how ...
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Does complex that has no overall charge still have color?

The iron complex $\ce{[Fe(H2O)6]^2+}$ is colored but I'm wondering, if a pair of chloride ion is inserted on its secondary valency to form [FeCl2(H2O)6], does the complex loose its color or not?
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How pure gold is obtained back from dissolved state in Aqua regia?

I know Aqua regia is used for purifying gold by dissolving gold in it, but how that dissolved gold is obtained back in the pure state? I searched everywhere, but I didn't get the answer. So, I am ...
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How many molecules of oxygen can Tris ruthenium dichloride bind to? [closed]

How many molecules of oxygen can Tris ruthenium chloride bind to? I haven't tried anything yet because I did not understand how to do this. I have 5 different concentrations of water: 100% saturated ...
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1answer
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Sodium metal burning off when conducting electrolysis and I don't know why

I melted down some table salt and used high voltage welder power source to try and separate the sodium and chlorine it was partially successful because I could smell and see chlorine gas but during ...
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43 views

What does the Madelung constant tell? [closed]

I am given a set of salts and a madelung constant of 2.4 and the instructor instructed us to identify which of the salts most likely have that value for A. I am unable to differentiate the salts from ...
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Doubts Regarding Activators for Non Sulphide Compounds in Froth Floating Method of Concentration of Ore

I was recently going studying about Metallurgy and read in a book namely Concise Inorganic Chemistry by J D Lee that the process of froath floating can also be applied to ores such as Malachite (CuCO3....
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62 views

Aqueous copper and how it reacts with NH3

I have learnt that you can test whether an unknown metal is copper by doing a simple test tube reaction. The reaction involves adding aqueous $\ce{NH3}$ to the test tube which contains the copper. ...
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1answer
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Why does only the cis-isomer of potassium dioxalatodiaquochromate(III) form?

A friend of mine performed a standard synthesis reaction of potassium dioxalatodiaquochromate(III) by adding potassium dichromate to ethandioic acid dihydrate and a little water. The synthesis ...
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Electron affinity of Halogens [duplicate]

Why electron attachment enthalpy of Chlorine is greater than Fluorine? It's the fact that Fluorine is most electronegative element and Chlorine is less electronegative than fluorine.But when talking ...
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Why is hypochlorite a stronger oxidizing agent than other oxychlorides?

The reduction potentials of perchlorate, chlorate, chlorous acid and chlorine dioxide in acidic and basic solutions are listed in the table below: $$ \begin{array}{lcc} \hline \text{Oxychloride} & ...
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3answers
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Is [Co(NH₃)₄Cl₂]Cl paramagnetic or diamagnetic?

$\ce{NH3}$ is known to be a strong field ligand, while $\ce{Cl}$ is known to be a weak field ligand. Is $\ce{[Co(NH3)4Cl2]Cl}$ a high spin complex or a low spin complex? I assumed this to be a high ...
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1answer
56 views

Making oxygen from iron oxide (aka rust) with sodium chloride?

I like videogames, and I've been playing a lot of "Oxygen Not Included" recently. It's not a perfect physics simulation, but it does appear to be realistic-ish (both Specific Heat and Thermal ...
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1answer
591 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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How could I prepare Iron(III) arsenate (FeAsO4)?

I have no idea in which conditions this compound is formed and would like to find out any / different ways it can be prepared (any easy way not requiring expensive equipment would be great).
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Does tantalum and tungsten really not form amalgams?

User @Poutnik has recently answered two questions(here and here) in which he/she quoted this statement from Wikipedia: Almost all metals can form amalgams with mercury, the notable exceptions ...
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How do I calculate for the solubility of Ca3(PO4)2 in Phosphoric Acid?

I know that the common ion effect will decrease the solubility of $\ce{Ca3(PO4)2}$ since Phosphoric acid has a same anion. However, phosphoric acid is a weak acid so I am really having a hard time ...
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How can the equilibrium shift, while Kc remains constant?

Consider the following reversible reaction. $$\ce{Cr2O7^2-(aq) + H2O(l) <=> 2 CrO4^2-(aq) + 2 H+(aq)}$$ What will happen to the position of equilibrium and the value of $K_c$ when more ...
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42 views

Chlorine gas and stainless steel

After dealing with a leak from a 73 kg compressed chlorine gas cylinder at 6 bar, there was green powder/rust/discoloration on the stainless steel tubing similar to copper chloride or copper sulphate. ...
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1answer
45 views

Black & Green Nickel Oxide-Supplemental

A previous question (April 2017) asked about black $\ce{NiO}$ did not supply any answer. Sadly, such a referral only deters colleagues from commenting on the current question. There is a great deal ...
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What were the tests to determine that a substance is an element or not? [closed]

What tests were conducted in the ancient days to determine whether a given substance was an element, say, how could one say that mercury, gold, silver, sulphur, phosphorous were elements?
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60 views

Oxidation state of carbon

How do we find the oxidation state of individual carbon in Mg₃C₂. Explain with the help of structure if possible. For the average oxidation number, we can exploit the fact that the molecule will be ...