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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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Gap in ionic radii

The above picture was shown in a presentation by my prof in inorganic chem as we were discussing ionic radii more in depth (all in pm). These are all isoelectronic radii. Notice the sudden leap in ...
5
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1answer
67 views

How do I interpret characters that are not 1 or -1 in a point group table?

When the character in a point group table is listed as 1 or -1, I understand how an object/orbital etc. transforms to give either itself or the negative of itself. When the character in a point ...
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0answers
15 views

The acid HA is 4.1 % hydrolyzed in solution. If the concentration of HA in solution is 2.0 M, what is the pH? [on hold]

The acid HA is 4.1 hydrolyzed in solution. If the concentration of HA in solution is 2.0 M, what is the pH? a. -.91 b. -.30 c. .30 d. .91 g. 2.77 For this problem i have no idea where to go.. ...
10
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1answer
4k views

Activated Carbon - Desorption in sunlight?

I have some activated charcoal pads or small "pillows" that can be used to adsorb odors and chemical fumes from different materials. The instructions say to put them out in sunlight to reactivate ...
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0answers
20 views

Why does monoammonium phosphate (MAP) have 52% of phosphorus (P2O5)?

The formula of monoammonium phosphate (MAP) is $NH_4H_2PO_4$. Manufacturers say that MAP has 10% of nitrogen (N) and 52% of phosphorus (P). However, its molecular mass is 115 u and the atomic mass of ...
9
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2answers
512 views

Inorganic chemistry handbook with reaction lists

There is a handy handbook on common inorganic substances' properties called "Reactivity of Inorganic Substances" (eds. R. A. Lidin, V. A. Molochko, and L. L. Andreeva). It was originally written in ...
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3answers
708 views

Identify KNO3 and KH2PO4 at home

I am not expert in chemistry. I need to find a way to identify a $\ce{KNO3}$ and $\ce{KH2PO4}$ powder at home. I suspect the seller gave me the wrong powder. What is a simple way to test between these ...
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19 views

How to determine the number of water ligands attached to Pd in palladium chloride aquacomplex PdClₓ · yH₂O?

Normally this can be achieved using UV-vis: there is a strong absorbance around wavelength 220 nm which varies based on the number of ligands. If the palladium concentration is too high, the solution ...
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1answer
28 views

important Stoichiometry question, just need formula or help and answer checking [on hold]

How many grams of Cobalt(II) chloride CoCl2 is needed to make 0.645 liters with a concentration of 1.25 Molarity and the moles are .724? (the molar mass is 129.839 I believe)
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2answers
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Why is arsenous acid denoted H3AsO3?

Inspired by this question, I'm wondering why arsenous acid is frequently denoted $\ce{H3AsO3}$, as opposed to $\ce{As(OH)3}$, which would appear to more accurately reflect its connectivity? [edit] I ...
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751 views

What is the chemistry behind black colour of platinum black? [closed]

Platinum is a silvery white metal and is highly unreactive then why it's powdered form "platinum black" is platinum metal but is black in colour. why would a metal such as platinum become black as a ...
11
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1answer
230 views

What would happen if someone consumed a Silica Gel Packet? [closed]

Most packaged goods have the tiny Silica Gel Packets packed along with a clear warning on every single packet. My question is: What hazards of desiccant silica gel are they concerned about that it is ...
4
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0answers
2k views

Ratio of rate of diffusion of two gases under constant temperature and pressure

I'm consulting one of higher classes books to study chemistry. I had been studying Graham's Law and question related to rate of diffusion. I came across a question[1] which says: Calculate the ...
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1answer
30 views

Reactions between Ca(OH)2 and CO2, and Sr(OH)2 and CO2

So I'm doing an investigation, and it involves using supersaturated solutions of Ca(OH)2 and of Sr(OH)2. I notice that there's always a flaky precipitate formed on top. I need to know about the ...
10
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2answers
57k views

Why does the solubility of Group II hydroxides increase and the solubility of sulphates decrease down the group?

I know that, solubility of alkaline earth metal hydroxides increases down the group and solubility of alkaline earth metal sulfates decreases down the group. I wish to understand the reason for these ...
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0answers
23 views

Resistivity of metals [on hold]

Well I know the theory which says that the resistivity of a metal is increased with temperature because the vibration of the individual atoms in the lattice become more violent and that resistivity is ...
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0answers
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CO2 IR extinction coefficients near the 15 micrometer band

I have searched multiple times for a spectrum or a table of the gaseous carbon dioxide Lambert-Beer extinction coefficients in the IR Earth thermal region. All I found was absorption spectra. Is ...
7
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1answer
910 views

What substance has the lowest Kₛₚ value?

What substance has the lowest $K_\mathrm{sp}$ and what is its value? The lowest I could find is $2.6\cdot 10^{-124}$ for cobalt(III) sulfide $\ce{Co2S3}$.
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0answers
27 views

How do I make alkaline iodide azide solution without azide?

I'm trying to do a Winkler titration for my high school depth study. The thing is, I need to source my own chemicals and so far I can buy NaOH and KI, but I can't find sodium azide anywhere. Could ...
6
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2answers
364 views

How is the trend of acidity in the sequence: phosphinic, phosphonic, phosphoric acid explained?

How is the trend of increasing $\mathrm{p}K_\mathrm{a}(1)$ value in the sequence: phosphinic $(1.24)$, phosphonic $(2.00)$, phosphoric acid $(2.21)$ explained (the image was taken from Housecroft ...
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1answer
89 views

Why is fluorine a oxidising agent?

Fluorine has very high charge/mass ratio as it is very small in size, its electron gain enthalpy is very high. Oxidizing agent pulls the electron cloud of the substance being oxidized towards itself, ...
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1answer
37 views

How to convert soluble colorless [HgI₄]²⁻ back to insoluble red HgI₂? [on hold]

When a solution contains $\ce{Hg^2+}$ and $\ce{I-}$, depend on the concentration ratio of $\ce{Hg^2+}$ and $\ce{I-}$, the following reactions can happen: $$\ce{Hg^2+ + 2 I- ⟶ \underset{insoluble red ...
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0answers
18 views

Which of the following has the most number of Atoms [on hold]

Which of the following has the most number of Atom? 5 g of lithium, 80 g of Rubidium, 20 g of sodium, or 125 g of the CEsium?
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22 views

How does this limit the value of boiling points as criteria for determining the purity of liquids? [on hold]

If ideal liquids x and y both have a boiling point of 110 C, what will be the boiling point of a mixture of x and y? How does this limit the value of boiling points as criteria for determining the ...
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1answer
34 views

Identifying Lewis acid

What is the Lewis acid on the reactants side? $$\ce{HNO2(aq) + HPO4^{2-}(aq) <=> NO2-(aq) + H2PO4-(aq)}$$ The book says it is the $\ce{H+}$ only, not the whole molecule of the nitrous acid, ...
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1answer
842 views

How does barium chloride identify sulfate ions?

What is it about barium chloride specifically that makes it able to form a precipitate with sulfate ions. What is the chemistry behind this?
4
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1answer
143 views

Is the surface of glass a fine layer of silanol?

Today we learned in class through a vivid demonstration that water sticks to glass. We were then taught that water sticks to glass because while glass is mainly composed of silicon dioxide, the ...
3
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2answers
1k views

Can hydrofluoric acid etch glass at a pH of 7.0?

Will it still etch glass when very dilute? Will the reaction still proceed slowly? At what pH will the reaction stop completely? From Wikipedia on hydrogen fluoride: "Although hydrofluoric acid is ...
4
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1answer
487 views

Can we make glass by heating Martian Soil

I was puzzled by a very interesting question. Can we heat up Martian soil and produce glass just the way we do here on Earth? (the basic way) For info, Martian sand consists of the following - $\ce{...
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0answers
18 views

Is there any instance where the fajans rules fail or can't be applied? [on hold]

.Is there any instance where the fajans rules fail or can't be applied? Like for any molecule?
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0answers
51 views

Why doesn't sulphur hexafluoride show back-bonding? [closed]

Why doesn't $\ce{ SF_6}$ show back bonding like $\ce{BF_3}$ to complete its d-subshell? Since $\ce{BF_3}$ shows back bonding to complete its p-subshell cannot S do the same to complete its d-subshell?...
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1answer
21 views

How does acidifying a compound in qualitative analysis make sure any interrupting compounds get removed?

So I've learnt that acidifying a compound for salt analysis is to remove any basic interference and remove interrupting compounds such as carbonates. How does it remove them or what reaction is taking ...
2
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1answer
63 views

How to calculate the volume or mass of carbon dioxide gas absorbed by a calcium hydroxide solution?

Carbon dioxide reacts with calcium hydroxide as shown by the equation: $$\ce{Ca(OH)2 (aq) + CO2 (g) -> CaCO3 (s) + H2O (l)}$$ A solution containing $\pu{0.1 mol}$ of calcium hydroxide reacts ...
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0answers
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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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2answers
7k views

Why is sand, sand; and why is glass, glass; While both mainly contain Silicon Dioxide?

I know that there is the famous process of heating material and converting them to glass; but what I don't know is, what is the chemical process of the creation of glass? Is it crystallization? How ...
0
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1answer
34 views

Spin-forbidden transition iof bromine

In one of the lectures of my spectroscopy course, the professor claimed that there is a strong absorption band in the UV/Vis spectrum of bromine, associated with a singlet-state to triplet-state ...
7
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1answer
117 views

Why do we need to add hydrogen to amorphous silicon?

I was recently studying about Staebler-Wronski effect observed in amorphous silicon (a-Si). I realised it was due to imperfections in the lattice structure and breaking of Si-Si bond to Si-H bonds. ...
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0answers
33 views

Testing for asbestos using readily available chemicals and tools?

Given that it is difficult to determine who is telling the truth in the recent claim that J&J covered up finding asbestos in their powder, is there any chemical test that we can perform on our own ...
14
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2answers
320 views

What makes Gorilla Glass more durable with each generation?

Gorilla Glass (GG) is one of the most recognizable brands of toughened glasses today, thanks to their marketing and widespread usage in various gadgets and automobile industry. According to Wikipedia,...
1
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1answer
88 views

E-glass degradation in water

At the moment, a question puzzling me is why and how glass fibers degrade in water environment? As the degradation of the glass fibers occurs, its reduces the strength of them. As far as I know, the ...
6
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2answers
14k views

Which has higher lattice energy: MgO or LiF?

Which has higher lattice energy: MgO or LiF ? A compound has higher lattice energy if it's ions have smaller size and greater charge Li cation is smaller than Mg cation => +1 for (LiF) Fluoride ...
5
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1answer
203 views

Can acid mine drainage form acid rain?

Can acid mine drainage form acid rain? Since normal acid rain is formed via combustion of fossil fuels, the sulphur dioxide and nitrogen dioxide are all in the gas phase, whereas in acid mines the ...
0
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1answer
39 views

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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2answers
61 views

Why is phosphorus (v) oxides molecular formula P4O10 and not P2O5

I understand that the name derives from the empirical formula; however, I do not understand why it does not exist as $\ce{P2O5}$. Is there a compound that exists with this as its molecular formula?
3
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1answer
36 views

Why would CuSO4-EDTA drops be used in Pb titrations?

We use CuSO4-EDTA drops (4) when preparing our lead titration samples for final titration by EDTA. What mechanism would there be for adding this to a titration? What benefit does it produce on Pb ...
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0answers
51 views

Action of sulphurous acid and active metal [closed]

I wish to distinguish Sulphurous acid and Sulphuric acid with action of an active metal. I do know the reaction with sulphuric acid, but I don’t know the reaction with sulphurous acid. Does active ...
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2answers
58 views

Why can't a weaker acid protonate the conjugate base of a stronger acid?

So I've heard that, supposedly, a weaker acid cannot protonate the conjugate base of a stronger acid to give that stronger acid. For instance, adding ethanoic acid to sodium sulphate will not result ...
0
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1answer
175 views

The reaction of iron with sulfur to produce Iron(II) sulfide is inconvenient (for me)

I am taking a lot of iron properties this semester, but I have found some contradicting piece of information about the reaction of iron with nonmetals illustrated with two cases \begin{align}\ce{ **...
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0answers
28 views

How to Make Paraffin Cubes that are flammable? [closed]

I have paraffin wax, I need to make cubes like weber cubes if you search online, and can I lower the melting point of paraffin using any other substance?
9
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1answer
6k views

What exactly is basicity?

In my textbook, it’s given that the trend of the basicity of the elements of group 15 is $$\ce{NH3 > PH3 > AsH3 > SbH3 \ge BiH3}$$ Also, it’s said that the reducing character decreases down ...