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.

723 questions with no upvoted or accepted answers
Filter by
Sorted by
Tagged with
0
votes
0answers
31 views

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 ...
0
votes
0answers
104 views

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 <=&...
0
votes
0answers
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 ...
0
votes
0answers
659 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{...
0
votes
0answers
55 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. ...
0
votes
0answers
387 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 ...
0
votes
0answers
507 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 ...
0
votes
0answers
504 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 ...
0
votes
0answers
537 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 ...
0
votes
0answers
606 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 ...
0
votes
0answers
67 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{...
0
votes
0answers
669 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?
0
votes
0answers
502 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 ...
0
votes
1answer
1k 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 ...
0
votes
1answer
123 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).
0
votes
1answer
405 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 ...
0
votes
1answer
478 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 ...
0
votes
1answer
62 views

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 ...
0
votes
1answer
71 views

Determining sulfate content in Mohr's salt

I am practicing problems for my chemistry test and I am stuck on the following problem: The value of $x$ in $\ce{Fe(NH4)2(SO4)2 ⋅ xH2O}$ can be found by determining the amount, in moles, of sulfate ...
0
votes
1answer
38 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 ...
0
votes
1answer
264 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?
0
votes
2answers
509 views

when Al2O3 melts which bonds are broken?

Previously, I was trying to understand why $\ce{Al2O3}$ has a lower melting point than MgO. An answer on quora said Do not confuse the character of the bond between the metal and oxygen with the ...
-1
votes
1answer
38 views

Reasons you would not want to heat a crystal hydrate (Measurement of water content in hydrate)

I understand that some decompose under heat. Some will form a different product, Such as CuSO4 becoming CuO if heated too much and we wouldn't recover all of the water. Some, such as AlCl3 actually ...
-1
votes
0answers
21 views

why is the bond angle of SF2 greater than H2S and bond angle of H2O greater than OF2?

I know that the bond angle is inversely proportional to the electronegativity of the surrounding atom but this can't explain why $\ce{SF2}$ has a greater bond angle than $\ce{H2S}$ though flourine has ...
-1
votes
0answers
31 views

How to calculate the concentration of the products when mixing two solutions of inorganic salts together?

Suppose we mix $\pu{10 mL}$ of $\pu{0.200 mol L^-1}$ silver nitrate $(\ce{AgNO3})$ with $\pu{5 mL}$ of $\pu{0.100 mol L^-1}$ sodium chloride $(\ce{NaCl}),$ and we are required to calculate the ...
-1
votes
0answers
39 views

Cinnabar decomposition by heating optional method?

Is it possible to decompose cinnabar into $\ce{Hg}$ and $\ce{S}$ instead of $\ce{Hg + SO2}$ with roasting and heating. What conditions need to be satisfied in the new method?
-1
votes
0answers
29 views

Change in Fermi level in a doped semiconductor

Suppose we have a crystal lattice of doped Si with dopant Boron atoms. The energy level of the holes of the Boron atoms are just some eV above the valence band of Si. My question: If we replace all ...
-1
votes
0answers
8 views

enthalpy of formation group 2 oxides

i understand the the trend for enthalpy of formation of alkaline earth metal oxides should become less exothermic moving down the group as the positive charge density decreases and the strength of the ...
-1
votes
0answers
25 views

Does back-bonding take place in CN-?

The hybridisation of C in CN- is sp and normally the -ve charge resides on the more electronegative atom , ie N. But while calculating formal charge C has a charge -1 and N 0, which indicates that C ...
-1
votes
0answers
42 views

question about electron donor-accpetor polymer

I'm reading a paper about electron-donor-acceptor polymer. Explaining donor unit, the paper says, 'Donor unit refers to an electron-rich unit. Thiophene and benzene are the two most basic donor units, ...
-1
votes
1answer
320 views

Why is the aluminium boiling point higher than silicon? And why is silicon's melting point higher than aluminium?

Why is the Aluminium boiling point higher than silicon? And why is silicon's melting point higher than aluminium? $\ce{Si}$ has 4 bonds which are covalent in nature. $\ce{Al}$ is metal thus possesses ...
-1
votes
1answer
38 views

Naming acids, oxidation numbers and charges

I have been studying chemistry for a short time and studied the nomenclature of inorganic compounds. I got to naming acids, and got really confused with several things, including the definition of ...
-1
votes
1answer
38 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. $0.05$ ...
-1
votes
1answer
25 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 ...
-1
votes
1answer
115 views

When H2NCH2CH2PH2 acts a monodentate ligand, it is the phosphine end that chelates. Why is that?

In some occasions, if the ligand acts on Pd it do so as a monodentate ligand. I am attempting to explain this phenomenon but came into a block.
-1
votes
1answer
478 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?
-1
votes
1answer
91 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 ...
-1
votes
1answer
590 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 ?
-1
votes
1answer
2k 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 ...
-1
votes
1answer
749 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.
-1
votes
1answer
68 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.
-1
votes
1answer
52 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 ...
-1
votes
1answer
536 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 ...
-1
votes
1answer
620 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? $\pu{640^\circ C}$?
-1
votes
1answer
2k views

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 ...
-1
votes
1answer
2k views

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?
-1
votes
1answer
3k 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 ...
-1
votes
1answer
1k views

Is the magnitude of ionisation enthalpy and ionisation energy is same?

In my textbook it is written that ionisation energy and ionisation enthalpy are two different quantities. ionisation energy is the amount of energy provided to extract an electron from the outermost ...
-1
votes
1answer
141 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 ...
-1
votes
1answer
112 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^...