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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Ionisation energies of Carbon and Boron

The first ionisation energy of Carbon atom is greater than that of Boron atom whereas, the reverse is true for the second ionisation energy. In order to explain the above statement I considered the ...
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Preparation of Copper (II) Sulfate Pentahydrate Solution

how would you make a solution of Copper (II) Sulfate Pentahydrate to achieve 150, 200, 250 and 300 mgL−1 concentration of copper? I do not have the anhydrous version of the solute. Also, when I ...
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I have prepared ferrous sulfate solution in water. After some time, brown precipitates observed. How to prevent the same?

When ferrous sulfate solution is prepared in water, after some time, brown precipitates appear, how to prevent the precipitates.
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829 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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Steps of crystallization

An excess of copper(II) oxide is added to dilute sulfuric acid to make crystals of hydrated copper(II) sulfate. The processes listed may be used to obtain crystals of hydrated copper(II) sulfate. ...
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Solids to liquids process

Melting point is the critical point at which a solid starts to be transformed into a liquid? Does this mean that the geometric lattice of a solid is broken?
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Melting point in hydrocarbons

Checking out the molecular structure and the melting points of various hydrocarbons I concluded: 1)branching increases the melting point of a hydrocarbon molecule 2)symmetry increases the melting ...
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161 views

ML6 Type Coordinate Complexes - Drawing a Molecular Energy Orbital Diagram

In class we recently discussed how to draw out molecular orbital energy diagrams for compounds such as NH3 (ammonia). Building upon this, we touched on how to construct a molecular energy diagram for ...
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Is the water absorbed by sodium polyacrylate available to react?

I'm curious whether the water absorbed by sodium polyacrylate would react with alkali metals, or be trapped by the sodium polyacrylate.
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What does thermal stability of compounds depend on?

Does it somehow depend upon the lattice energy of the compound? My textbook says that Lithium carbonate is not so stable to heat and forms more stable $\ce{Li2O}$ and $\ce{CO2}$. Could it depend on ...
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Why do reference electrodes have porous frits or membranes as a salt bridge?

From what I understand, they act as a salt bridge between the reference electrode electrolyte and the analyte solution (in a potentiometric titration). But why do we use partially permeable membranes ...
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33 views

Improvement of the thermal stability of hydrous zirconia by post-synthesis treatment with NaOH and NH4OH solutions

I read a paper about how researchers improved the thermal stability of hydrous zirconia by post-synthesis treatment with $\ce{NaOH}$ and $\ce{NH4OH}$.[1] While the surface area of non-treated ...
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880 views

Why ammonium hydroxide precipitates metal salts?

When I was going through the chapter on pnicotgens, I got to know that ammonia acts as a Lewis base and it dissociates in water giving out hydroxide ion and the further hydroxide of ammonia, which we ...
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How to get rid of calcium carbonate and other salts formed by calcium hydroxide in air?

My basic question comes from the idea that in olden days people used lime to paint houses, so after it is dried out it becomes white paint which sticks to the walls. So, how to get rid of it? The ...
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Comparing the number of oxidation states of Vanadium and Arsenic

USNCO 2004 Question 45 states: Which element exhibits the greatest number of oxidation states in its compounds? (A) Ca (B) V (C) Cu (D) As I ruled out Ca, as I know it only exists as +2. I ...
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Does the reaction between phosphorus and chlorine produce phosphorus trichloride or phosphorus pentachloride

Phosphorus has two covalent compounds it can form with chlorine, where it is a single, central atom bonded to chlorine, which are phosphorus trichloride and phosphorus pentachloride. Because of this, ...
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400 views

Half-reaction for ammonium nitrate comproportionation into dinitrogen monoxide.

Ammonium nitrate comproportionates into dinitrogen monoxide in the following reaction: $\ce{NH4+ (aq) + NO3- (aq) -> N2O(g) + 2H2O (l)}$ I attempted to write the half-reactions by calculating ...
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Acid HClF6 and HIF6

I was wondering about $\ce{HClO4}$ which is a very strong acid . I thought it can be made stronger by replacing $\ce O$ with $\ce F$ to make $\ce{HClF6}$ but didn't find its existence . I thought that ...
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EQPt pH of a Monoprotic Acid-Base Titration: Product of Molarites Over Their Sum

Context The Henderson-Hasselbalch equation is as follows. $$pH=-\log\big(K_a\big)+\log\bigg(\frac{[A^-]}{[HA]}\bigg)$$ One may follow its derivation in order to understand how it came to be, yet ...
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783 views

How to find the combining valence of an anion when it exhibits variable valency?

I'm doing an online course and can't for the life of me figure out how to write chemical formulas from the chemical name. Take the example of calcium chloride. I know the the valence for calcium is ...
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338 views

UV-Vis spectra of [Co(H2O)6]^2+ (hexaaquacobalt ion)

I observe the UV-Vis spectrum of $\ce{[Co(H2O)6]^{2+}}$ and there is a little peak at ~$\pu{640nm}$. By observing the Tanabe-Sugano diagram I see that the spin allowed transitions are: $\ce{^4T_{1g}(...
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Why do bicarbonates tend to be more soluble in water than carbonates, for Group 1 and Group 2 elements?

In Group 1 and Group 2, it is usually found that bicarbonates tend to be more soluble in water than carbonates. For example: $\ce{NaHCO3}$ has higher solubility than $\ce{Na2CO3}$ As most of the ...
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What's the chemical reaction involved when adding Caesium to water?

According to the Notting Hill and Ealing High School, the reaction of caesium $\ce{Cs}$ with water $\ce{H2O}$ gives the following equation, $$\ce{2Cs (s) + 2H2O (l) → 2CsOH (aq) + H2 (g)},$$ producing ...
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131 views

Gas chromatography and retention time

I did an experiment of gas chromatography which contained the compounds: octane, butanone and propanol. We injected a mixture of the three compounds in the polar column and then a mixture of it in the ...
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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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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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542 views

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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180 views

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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142 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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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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54 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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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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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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Why is KOH less soluble than NaOH in alcohols?

Alkali metal hydroxides solubility in water increases down the group. Because the mechanism of dissolution is the same in alcohols, why the anomaly?
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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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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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605 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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54 views

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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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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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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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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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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581 views

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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% 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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632 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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466 views

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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505 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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121 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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