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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Oxidation of Magnesium with Nitric Acid
Write an unbalanced equation for the following: Magnesium metal is added to dilute nitric acid.
My attempt: Nitric acid commonly oxidizes metals and gets itself reduced in the process - to $\ce{NO}$ ...
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680 views
Why the tendency of ClO3 to form dimer is high?
I read that tendency of $\ce{ClO2}$ to form dimer is less and that of $\ce{ClO3}$ to form dimer is more.
I can understand the reason for the former because the unpaired electron is more delocalized ...
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In brown ring test, how is NO^- formed?
$$\ce{NO3- + 3[Fe(H2O)6]^{2+} + 4H+ -> NO + 3[Fe(H2O)6]^{3+} + 2H2O}$$
$$\ce{NO + [Fe(H2O)6]^{2+} -> [Fe(NO)(H2O)5]^{2+} + H2O}$$
I read that in the brown ring complex $\ce{[Fe(NO)(H2O)5]^{2+}...
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Boiling points of Hydroxylamine and water
Why does $\ce{NH2OH}$ have a lower boiling point than water? According to Wikipedia, hydroxyamine has a boiling point of 58 °C. Could this be due to the extent of hydrogen bonding among both molecules?...
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Literature values for NaCl Eutectic - Calculating the eutectic
For the NaCl eutectic I've seen two values widely used:
23.3wt% NaCl - James G. Speight: Lange's Handbook of Chemistry 2017)
5.1 M NaCl (Marion + Kargel 2008 - Cold Aqueous Planetary Geochemistry ...
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72 views
Strength of OH bond
This question might seem a little general, but how can we know the strength of the OH bond of third period element hydroxides? Does it increase across the period or does it decrease?But more ...
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25 views
Cyanamide mesomeric contributors
Which form of the cyanamide ion is more stable?
As per the resonance rules, I find both of them equally stable as number of bonds is the same, more electronegative atom has negative charge and so on. ...
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52 views
Theoritical amount of Sodium Bicarbonate
I have to find the theoretical amount of sodium bicarbonate. The steps I followed in order to produce it are:
15g $\ce{NaCl}$ are added to a beaker. Then we add 87.5 mL of $\ce{NH3}(12M)$
We add 115g ...
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327 views
Production of fluorine gas
I have to suggest a method in order to produce $\ce{F2}$. It also says that I should consult the redox potential values. I know that there is a way to produce fluoride which is:
$$\ce{K2[MnF6] + 2 ...
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Does this freezing point depression problem make sense?
The solvent is water. Pure water has a freezing point of 0 degrees Celsius. How come, in this problem, the addition of solute results in an elevation of the freezing point from 0 to 0.46 degrees C? Is ...
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Order of Basicity of Nitrogen Trihalides
I was asked to arrange nitrogen tri-halides in order of increasing basicity. On looking up the answer online, it turned out to be the following: $\ce{NF3}$ < $\ce{NCl3}$ < $\ce{NBr3}$ < $\ce{...
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Band gap difference in different allotropes of Group4 materials
Diamond and bulk Si are both Group 4 elements found in their $sp^3$ hybridized states, having bandgaps of around 5.3eV and 1.1eV respectively, but Graphene and Silicene are both $sp^2$ hybridized ...
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pH(H3O+ ion concentration) of a mixture of 2 weak acids
I need to find out the $\ce{H3O+}$ ion concentration in a mixture of 2 weak acids $\ce{HA1}$ and $\ce{HA2}$.
They will be ionised as
$$\ce{HA1 + H2O <=> A1- + H3O+}$$
And
$$\ce{HA2 + H2O <=&...
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107 views
Formation of complexes by ferric ions is more frequent than ferrous ions. Why?
Looking at the electronic configurations of ferrous and ferric ions they are d6 and d5 systems respectively. Hence, ferric ions are more stable. But in octahedral complexes like hexathiocyanates, the ...
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512 views
Which has highest solubility in water?
Among $\ce{LiF}$, $\ce{LiCl}$, $\ce{LiBr}$ and $\ce{LiI}$ is $\ce{LiI}$ the most soluble compound ? As the lattice energy depends on size and smaller the size of ions greater the lattice and as $\ce{...
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Simplified Chromatography - will this work?
I am interested to separate a sample matrix via a method very similar to chromatography. The reason I am asking about this is because I am planning to integrate this method with my SERS application.
...
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358 views
Titration of hydrochloric acid with sodium hydroxide
I have a question regarding titration of hydrochloric acid with sodium hydroxide. Assume you have a solution of NaOH with pH = 12. With this NaOH you titrate a HCl solution. Then, will the pH of the ...
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499 views
Qualitative Analysis of Different Cations
So, we were taught in lab how to identify a couple of cations and anions through elimination and confirmatory tests. I was wondering, however—how would this work if the test solution were made up of ...
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442 views
Difference between ionization enthalpy and work function?
The work function is stated as the energy required to eject an electron out.. And ionisation enthalpy is stated energy required to move an electron out of the gaseous atom. I don't understand if there ...
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452 views
Interaction between Ozone and Carbon Dioxide
We are trying to predict what will happen when carbon dioxide gas is introduced into a contact chamber that serves as an ozone contact chamber. These contact chambers presently oxidize compounds found ...
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What results from combining monopotassium phosphate, magnesium sulfate and calcium nitrate?
If I mix monopotassium phosphate, magnesium sulfate, and calcium nitrate together in aqueous solution, what chemicals will result?
Are these safe to combine (i.e. any toxic gases, etc.)?
I thought ...
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55 views
% Fe in a sample
Seems so simple but is confusing me as when I take into account final weight I don't get one of the answers.
An iron ore was analysed by dissolving a $1.1324~\mathrm{g}$ sample in concentrated $\ce{...
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595 views
Why is copper(II) oxide green?
Copper(II) oxide is black, but when we find the percentage of oxygen in air by volume using ammonia, copper, and ammonium chloride, the color of $\ce{CuO}$ turns green. What is the reason for this?
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Why does boron fume in moist air? Is the following accurate?
I initially guessed it was due to the formation of $\ce{H3BO3}$ but am now doubtful. Does it have anything to do with $\ce{HCl}$ formation? If the question referred to a boron halide, I could answer ...
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483 views
Half/fully filled orbital stability
Beryllium the configuration is [He] 2s2 i.e fully filled but still quite reactive
Also in neon [He]2p4 , neither half filled nor fully filled, still quite stable compound (As it forms compound with ...
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Rules to identify the most stable resonance structures
While studying resonance from this Chemistry LibreTexts article, I found the rules to follow in order to decide which structure is the most stable. Among them:
The structure with the least number of ...
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1answer
109 views
Synthesis of ZnO by wet chemical method and reducing particle size by ball milling
I synthesized bulk $\ce{ZnO}$ which is pure white in colour, but after high energy ball milling colour changes from white to yellow, why?
Figure 1: Zinc oxide (courtesy of Wikipedia).
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366 views
Why are the nitrate salts hygroscopic?
Any metal is never extracted from its nitrate salt because nitrate salts are highly soluble in water, so flow away along with rainwater, or any other source.
But why are the nitrate salts so ...
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1answer
437 views
hydrated halide structure
What is the structure of $\ce{LiCl.2H2O}$?
I think when $\ce{LiCl}$ is put in aqueous medium, it will break into $\ce{Li+}$ and $\ce{Cl-}$. Then $\ce{H2O}$ will give LP to Li and hydrate it. But why 2 ...
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23 views
What determines the atom or molecule that receives electrons during oxidation?
I'm no chemist, so bear with me.
From my understanding, the reason metal oxidation occurs is because the metal is losing electrons to the oxygen ions in the air; and that an ion is an atom or ...
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111 views
What are the isomers of a complex having a structure of M(AB)2C2?
Our instructor have us answer an isomerism problem of a crystal structure that has a form of $\ce{M(AB)2C2}$. I keep getting 9 isomers, which includes the optically inactive isomer, and my peers and I ...
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154 views
Why is moist hydrogen made to react with chlorine to give hydrogen chloride?
Moist hydrogen reacts with chlorine in diffused sunlight to give out hydrogen chloride. Why is moist hydrogen used? Why not dry hydrogen?
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Boiling nitric acid and gold plating
I was watching a YouTube video "Home Brew Gold Plating" by
Cody'sLab and had a few questions.
In the video to dissolve the gold first he creates a mixture of $\ce{HCl}$ and $\ce{HNO3}$ (aqua regia). ...
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Why highly electropositive elements form strong bases?
I know that elements like sodium form hydroxides completely dissociate in water than magnesium hydroxide. I came to a conclusion that the nature of bonding may affect this result, that is ostensibly ...
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Ionic lattice structure of copper (II) sulfate pentahydrate
I would like to ask about the structure of the $\ce {CuSO4*5H2O}$ solid. Recently, I have learnt that the colour of $\ce {CuSO4 * H2O}$, an intermediate in the thermal decomposition of the ...
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1answer
25 views
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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1answer
104 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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1answer
20 views
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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1answer
33 views
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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70 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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226 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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1answer
453 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
210 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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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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1answer
46 views
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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1answer
305 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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384 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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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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1answer
2k views
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 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 ...
