An atom or molecule in which the total number of electrons is not equal to the total number of protons, giving it a net positive or negative electrical charge.An ion consisting of a single atom is an atomic or monatomic ion; if it consists of two or more atoms, it is a molecular or polyatomic ion.
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41 views
+50
Conducting current in electrolytes
I keep trying to figure out how current is conducted through an electrolyte but all I can find are BS half answers. They say the ions conduct, but the specifics are poorly explained or absent. I ...
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1answer
52 views
Why is there a charge on $\ce{COOH^{-1}}$?
The dissociation of formic acid ($\ce{HCOOH}$) is:
$$
\ce{HCOOH -> H+ + COOH-}
$$
Why is there a charge on $\ce{COOH^{-1}}$
though? Is it achieved through:
$$1\times(\ce{C^{4+}}) + ...
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1answer
64 views
What is Molar Conductivity of an electrolytic solution
Please explain the physical meaning it carries ? And how is it that it can increase with dilution ?
And why is it called Molar ?
And what is equivalent conductivity ?
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1answer
84 views
How to get the valencies of elements?
How to find the valencies of elements by using it's distribution of electrons?
Explain the method in simple words?
Do you have to study the valencies or is there is a simple way of remembering?
PS: ...
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3answers
62 views
If magnesium oxide is $\ce{2Mg + O_2 → MgO}$ then why is aluminium sulphate $\ce{2Al^{3+} +3SO_4^{2-} → Al_2(SO_4)_3}$?
Why is it not $\ce{Al_2SO_{12}}$?
Why doesn't the 4 and 3 get multiplied?
Show step by step working of formation of both $\ce{MgO}$ and $\ce{Al_2(SO_4)_3}$.
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0answers
48 views
In an acid, what does $\ce{ClO_3-}$ reduce into?
...but, most importantly, why? It's $$\ce{6e- +ClO_{3}^- +6H^+ \rightarrow Cl^- + 3 H_2O}$$
Now, with the gift of foresight, why was the equation for its oxidation not instead $$\ce {2e^- +ClO_{3}^- ...
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1answer
42 views
Coordination number of CsCl (high school chemistry)
Question:
Suggest an explanation for the coordination number in the $\ce{CsCl}$ lattice being different from those in $\ce{NaCl}$.
Standard answer:
Caesium ion is larger than sodium ion, ...
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1answer
52 views
Trying to identify an ion
Could anyone identify this for me? It's from a quiz bowl clue that doesn't have the answer with it.
"This linear polyatomic ion containing three atoms of carbon has a negative four charge and is only ...
1
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0answers
46 views
Selectivity Coefficients of Ion Exchange Resins - Selectivity Reversal with TDS / Ionic Strength
I'm currently studying ion exchange resins and generally getting a bit stuck on some points of information which I do not fully understand / are not very well explained within the literature.
I ...
1
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1answer
29 views
Effect of light on ionic compounds
If i had an ionic molecule which needed 4 eV to break the ionic bond, a 7 eV photon is shot at it. It is absorbed by the molecule and breaks, where do the rest of the energy goes?
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1answer
46 views
Electronic and geometric configuration of Fe(OH)₂
I'm having serious problems in the electron configuration of iron dioxide $\ce{Fe(OH)2}$ because all I could come up with was $\ce{Fe}$ double bonded with each oxygen and single bonded with each ...
3
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1answer
59 views
Why does electrolysis take so much time?
What makes electrolysis or electroplating take so long ? What stage takes longer when ions are attracted to electrodes or when they gain or lose electrons at electrode.
And if we are talking about an ...
5
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2answers
74 views
O2 in a 3- oxidation state?
Has diatomic oxygen ever been observed with a 3- charge, i.e. $O_2^{3-}$? Have any ab intio calculations been done on this ion?
4
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0answers
41 views
Can the electrolytes be in gaseous state? [duplicate]
Possible Duplicate:
Will gaseous ionic compounds be free moving ions?
I know it sounds extremely expensive, but what if we could heat the ionic compound to evaporate it and achieve the ...
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3answers
155 views
Will gaseous ionic compounds be free moving ions?
I knew while learning about electrolysis that if the ionic compound is molten it becomes free moving ions.
If that is the case, what will happen if I continued heating till it reaches the boiling ...
3
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1answer
186 views
What is the exact definition of Salinity?
I am a bit unclear on the definition of salinity. I have always thought of it as simply total dissolved ions.
Wikipedia seems to agree "saltiness or dissolved salt content" but many other sources ...
2
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0answers
17 views
Why does the passivation layer in DRIE protect just the mask and not the substrate?
Here's a good link as an introduction to DRIE:
BSAC: DRIE Process Development
The $C_4F_8$ (refer Pg. 9 on the link) passivates the entire top layer. But when $SF_6$ ion bombardment occurs, only the ...
6
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1answer
71 views
Are redox half-reactions “real”?
Are the half-reactions used in analyzing redox reactions a real thing or are they a conceptual shortcut?
Is there a way to, however briefly, run a half-reaction by itself without the corresponding ...
0
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1answer
173 views
How does Phosphorus Pentachloride bond?
The thing I am having trouble with: why does $\small\ce{PCl4}$ form a +1 ion and $\small\ce{Cl}$ a -1 ion?
0
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1answer
80 views
Determining the exact charge of ions that will be formed by an atom using the periodic table
I don't know how to obtain the "exact charge of the ions" that will be formed by each atom mentioned. I also have to figure out whether they are positive or negative.
Hydrogen, for example, can form ...
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1answer
366 views
Samsung's S-Plasma Ion - scientific basis
Has anyone come across a scientific study of the S-Plasma Ions that Samsung claims will purify air from microbes, allergens and free radicals? I would prefer publicly available research findings.
The ...
4
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1answer
54 views
What is the exact nomenclature of ionization?
I'm a little confused as to what reactions are considered ionizations. Is there any requirement for the educts, for example?
Some references suggest that it's only considered an ionization if you ...
3
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0answers
61 views
Difference between non-thermal and thermal ionized gases
Why or when does non-thermal plasma become thermal? How do we know before hand if the ion temperature will differ from the electron temperature, on what parameters does it depend - where is the ...
8
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2answers
400 views
Can I test for lead with household chemicals?
I picked up a metal fence loop cap today and took it home just because I liked the shape.
(^ not mine)
I cleaned it, but some of the paint is chipping off. I'm only vaguely thinking about lead, and ...
5
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1answer
184 views
What is the behavior of a Zwitterion during ion exchange chromatography?
We're interested in purifying a protein that has an azide moiety using ion exchange chromatography. Due to its unique structure, the moiety is a Zwitterion with a novel chemical behavior. My question ...
5
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1answer
452 views
Why is 1-ethyl-3-methylimidazolium tetrafluoroborate (EMI-BF4) often considered a prototypical room temperature ionic liquid?
It seems from a brief search of the literature that 1-ethyl-3-methylimidazolium tetrafluoroborate (EMI-BF4) is a prototypical room temperature ionic liquid (RTIL) that has been studied extensively. ...
4
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2answers
126 views
Stability of H⁺ ion
I know that H+ is not possible in water and it is present as H3O+. But later on I come to know that even H3O+ is not possible and that it is present as H9O4+.
Why does this happen? What give that ...
4
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5answers
492 views
Why is $\ce{AgCl}$ less soluble than $\ce{AgNO3}$?
Related: Reaction between Silver Nitrate and Aluminium Chloride
Experimentally, $\ce{AgCl}$ is insoluble in water, but $\ce{AgNO3}$ is soluble. They're pretty common in a lab (well, $\ce{AgCl}$ ...
2
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1answer
495 views
Why does activated carbon preferentially adsorb anions?
Brands like Brita and Pur (in the U.S.) have made a name for themselves for the ability of their product (essentially a large-pore filter with activated carbon/charcoal) to extract the added chlorine ...
4
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1answer
147 views
How does conductivity work for non-redoxed ions?
Related (very similar, but here I want a mechanism) http://physics.stackexchange.com/q/21827/7433
By the Kohlrausch law, all ions contribute to the conductivity of an electrolyte.
Now, as I ...
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2answers
117 views
How to differentiate a metal from its ion?
I am working on metal and its ion. The problem is, I would like to know whether the metal has been converted to its ionic form or not.
The hypothesis for the analysis is: Metals are good conductors ...
3
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2answers
222 views
Molecular explanation of the Hofmeister Series
The Hofmeister Series is a useful metric in understanding how to precipate proteins. However, wikipedia and many other source indicate that the order of the series is rather empirical. I'm curious ...
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3answers
199 views
Silver, its bactericidal features and water
I often hear that water gets purified by being in a silver vessel, which sounds plausible because of bactericidal feature of silver. What doesn't sound plausible, though, is the way it's explained: ...
5
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3answers
465 views
How does NaCl maintain its crystalline structure?
My understanding is that $\mathrm{NaCl}$ is an ionic compound, in which $\mathrm{Cl}$ becomes (effectively) $\mathrm{Cl^-}$ and $\mathrm{Na}$ becomes $\mathrm{Na^+}$. So I understand why I would get a ...
