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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% 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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634 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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645 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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387 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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468 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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61 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 ...
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42 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 ...
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29 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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244 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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195 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 ...
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38 views

Most stable oxidation states for Lanthanides

I've found that the most stable and common oxidation state for the Lanthanides is +3. The explanation given is that 1 electrons from the 4f orbital and 2 electrons from the 6s orbital are removed and ...
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reappearing copper stain

I left a copper pot on a wet laminate countertop. After a couple of days, there was a green-blue stain on both the pot and the counter, which none of the typical household cleaners are up to the task ...
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30 views

Why is iron(II) sulfate hydrate more soluble in acid than in water?

In the lab I was told that iron(II) sulfate dissolves more readily in sulfuric acid than in $\ce{H2O}$ and hence we didn't use water. Can I get an explanation why please?
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Effect of dilution on equilibrium confusion

An example provided in Pearson Chemistry Queensland 12 by Nick Holmes et al:1 $$\ce{Fe^{3+}(aq) + SCN^-(aq) ⇌ FeSCN^{2+}(aq)}$$ The figure above shows the effect of doubling the volume of the system ...
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40 views

pH of a solution of acetic acid after adding sodium hydroxide

Let's consider $\pu{100ml}$ of a solution of $\pu{0.01M}$ acetic acid ($\ce{CH3COOH}, \ K_\mathrm{a}=1.8\times 10^{-5}$). Find the $\mathrm{pH}$ after adding of sodium hydroxide corresponding to $\...
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1answer
33 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 ...
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1answer
29 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
24 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
93 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.
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121 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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79 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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427 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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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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441 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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67 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.
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51 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
445 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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1answer
532 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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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?
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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 ...
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165 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 ...
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1answer
113 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 ...
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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^...
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380 views

electron counting for transition metal-oxo ligand compound

Using donor-pair method, how many electrons would an oxo ($O^{2-}$) ligand contribute? I cannot decide if it is 2 or 4.
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3answers
71 views

What's the effect of Pressure change in Chemical Equilibrium if any reactant or product is Solid or Liquid?

I am studying La-Chatelier's Principle of Chemical Equilibrium. I got a problem of Pressure change in Chemical Equilibrium. I know that Pressure change If a reversible reaction is in equilibrium ...
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1answer
62 views

Has a low spin tetrahedral Ni(II) complex been synthesised?

How can $\ce{Ni(II)}$ form a low spin tetrahedral compound? I was not able to find such compounds. $\ce{Ni(II)}$ will have $\mathrm {4s^03d^8}$ and tetrahedral needs $\mathrm{sp^3}$. So $2$ electrons ...
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Why is HPF4 formed?

According to chapter 4 in Inorganic Chemistry by Garg and Singh [1] (numbering scheme mine): $$\ce{2 PF3 + 3 H2O -> H3PO3 + HPF4 + 2 HF} \tag{1}$$ At the same time $$\ce{PCl3 + 3H2O -> H3PO3 +...
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47 views

Can iodine replace other halogen as well?

While reading about halogen family I encountered the reaction: $$\ce{NaClO3 + I2 -> NaIO3 + Cl2}$$ I know that that the oxidizing tendency of halogens decreases down the group, so I think that the ...
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1answer
728 views

What is the trend of thermal stability of group 1 oxides?

The thermal stability of most compounds of Group 1 elememts (hydroxides, carbonates, nitrates) increases down the group due to decrement in charge density of the cation. Now, according to one of my ...
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34 views

Selectivity of metal nitrates towards ammonium bicarbonate

I am performing coprecipitation reaction, and in the precipitating step, I have a bunch of metal nitrates(ferric nitrate, aluminium nitrate and barium nitrate)in a solution reacting with ammonium ...
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1k views

Why is helium considered as a non-metal?

How can helium be considered as a non-metal based on its chemical properties? Helium is a noble gas; it does not take part in chemical reactions under ordinary conditions. But non-metals tend to gain ...
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Sulphur trioxide problem

I'm having minor difficulties solving this problem: How many grams of sulfur (VI) oxide can be derived from 8 g of sulfur and 6 g of oxygen? (S-32) I've tried to solve it this way: $\ce{2S + 3O2 -...
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1answer
49 views

How much NaOH I have to add to increase pH?

I'm stuck in solving this problem. I have two solution of $\pu{5 M}$ $\ce{H2SO4}$ that needs two consequential $\mathrm{pH}$ increasing: the first from the natural $\mathrm{pH}$ of $\pu{5 M}$ $\ce{...
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2k views

Structure of IO2F5(2-) dianion

This question came in my exam to draw the Structure of $\ce{[IO_2F_5]^2-}$ I am confused. Here's what I reasoned: Iodine will have hybridisation $\ce{sp^3d^3}$ so it will be pentagonal bi ...
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41 views

Comparing acidic nature of alkali metal hydroxides

What is the correct order of acidic strengths of $\ce{NaOH}$,$\ce{KOH}$ and $\ce{RbOH}$? The solution of this problem stated that Since their order of basicity is $\ce{RbOH}>\ce{KOH}>\ce{NaOH}$...
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What is the difference between stability constant, formation constant, and successive stability constant?

I want to know what about the difference of stability constant, equilibrium constant of formation (formation constant), and successive stability constant in terms of metal-ligand complex reaction. I ...
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55 views

Is it possible to separate Lead(II) sulfate from sulfuric acid?

To prepare lead(II) sulfate $\ce{PbSO4}$ from lead(II) carbonate $\ce{PbCO3}$, can I add excess sulfuric acid to lead(II) carbonate so that the products formed will be excess acid with lead(II) ...