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Questions tagged [ions]

For questions about ions - atomic or molecular particles having a net electric charge. Do NOT use this tag just because your question involves ions but is not about the ions themselves (as in electrochemistry, etc.).

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21 views

Provide a test and the net ionic equation for the tests used [on hold]

Provide a test (including reagents needed and what to look for if it gives a positive result), and the net ionic equation for the tests used, to distinguish between the following compounds: NiCl2 or ...
0
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2answers
19 views

How to make auto zero in calibration graph during graph plotting? [on hold]

I am using Origin 9.1 software for graph plotting. I have collected data from Ion Chromatography Instrument. Peak area vs conc. It should be y = mx type of graph Fitted graph shows in few cases ...
1
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2answers
25 views

In Ion Chromatography instrument, Does the specific conductivity (peak area) of an analyte depends upon background conductivity?

In Ion Chromatography instrument, Does the specific conductivity (peak area) of an analyte depends upon background conductivity ? Assume Specific Conductivity (peak area) of fluoride ion is 4 unit ...
2
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1answer
95 views

How to determine the greatest d orbital splitting?

This question comes specifically from an IB Chemistry HL Paper 1 in May 2018 TZ1, namely question 8. Which complex has the greatest d orbital splitting? It gives 4 Complexes $\ce{[Fe(H_2O)_6]^{2+}}$,...
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0answers
20 views

Kinetic Shift of Simple Cleavage

What is the kinetic shift for the simple cleavage fragmentation if the ion source residence time is 100 microseconds, the time to reach the detector after leaving the ion source is 10 microseconds? (...
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0answers
43 views

Mass-Charge balance equations [closed]

How to write mass balance equations and charge balance equations of the solution composed of $\pu{0.1M}\text{ }\ce{ NaH2PO4}~ \text{and}~\pu{0.05M}\text{ }\ce{ Na2HPO4}$? After writing the equilibria ...
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0answers
19 views

Is the analyte included in the ionic strength equation?

I don't quite understand the calculation for ionic strength of a solution. The formula includes the concentration and charges of the ions in solution, however, is the analyte (whatever we're trying to ...
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0answers
26 views

how can I predict the rate of water ions precipitation on a surface?

Consider a titanium pot that contains 1kg water with the following ions: $[Ca^{2+}]=22000$ ppm, $[Mg^{2+}]=1500$ ppm,$[Sr^{2+}]=791$ ppm,$[Na^{1+}]=48000$ ppm,$[Cl^{1-}]=120000$ ppm,$[SO_4^{2-}]=...
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1answer
77 views

Why does beryllium lose two electrons when it’s orbitals are already full?

I have a rudimentary understanding of orbitals, as in what they are, the shapes (l, I think) and of the principles. So I was doing the electronic configuration for beryllium, it has 4 electrons. So ...
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2answers
60 views

Why does MgCl2 become Mg^2+ and Cl^-? [closed]

I'm taking a biology class, and it's one-chapter intro to chemistry chapter had been driving my study group nuts. On a recent quiz, it asked the question: In water, $\ce{MgCl2}$ dissociates into $\...
0
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1answer
64 views

Why is Fluoride anion less stable than iodide anion?

Down the halogen group , electropositive character increases , then why is it that Fluoride ion is the least stable ? The counter arguement is that fluoride ion has four lone pairs and a small size ...
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0answers
18 views

Sorting ions by radius and ionization energy

Sort the ions $\ce{F-}$, $\ce{Mg^2+}$, $\ce{O^2-}$ by their ionic radius and the minimal energy needed to remove an electron. For the radius I considered that they all have the same electron ...
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0answers
43 views

What solvent can dissove both antimony chloride and titanium isopropoxide?

Am trying to create antimony doped titanium dioxide thin film. I plan on doing so with SILAR(successive ionic layer adsorption and reaction). My cationic precursor will be a solution of both antimony ...
4
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2answers
634 views

Superscript and subscript together after the same atom

In the chemical formula of some ion compounds, there is the necessity to write the charge in the superscript and the numbers of atoms in the subscript, but together at the right of the same symbol ...
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1answer
46 views

Broken iPhone battery no fire [closed]

I work on electrical and Electronics quite often and working on a iPhone the other day with a dead battery,I ruptured it open trying to remove the glue I smelled a funny smell like nail polish remover ...
7
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1answer
83 views

Does the hydrohelium dication exist?

It is well-known that there exists the $\ce{He2^2+}$ dication, and also $\ce{HHe+}$ and $\ce{H2+}$ cations. But I could not find any definite information about the existence or inexistence of the $\ce{...
13
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2answers
533 views

Do non-classical carbanions exist?

There are some non-classical carbocations, such as the 2-norbornyl cation, in which the positive charge is heavily delocalised. Have non-classical carbanions also been discovered? I have not seen any ...
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1answer
26 views

How can I get create complex metal ion solution such that the majority of the central metal ions only have one specific ligand?

I'm looking for a way to have the ligand, Chloride ion, datively bond with Copper Sulphate. I understand it is as simple as creating a solution of Hydrochloric Acid and dissolving Copper Sulphate ...
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1answer
39 views

How does NH4+ come to being?

There are 5 valence electrons in Nitrogen and in order for it to have a complete outer shell (8 electrons) it needs 3 more electrons. Why is it the case that the Nitrogen needs 4 Hydrogen instead of 3 ...
2
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0answers
46 views

Is there a single word antonym for dissociate? [closed]

Teaching ionic and covalent compounds, and one of the differences is that some ionic compounds will dissociate when dissolved but covalent compounds usually do not (salt water vs. sugar water, just ...
0
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2answers
30 views

Why don't ions form crystal lattices in water and other polar solvents?

Ionic compounds are in the form of crystal lattices, and when they are dissolved in a polar solvent, they are bonded with the corresponding cations/anions of the polar solvent. For example, $Na^+$ ...
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1answer
23 views

Why do you drop the charge in the crossover method?

When I do the crossover method of crossing ions, my teacher always tells us to drop the charge, but won't tell us why. I was wondering if we add it back in later, and if not, why does it disappear?
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2answers
91 views

Simple question about mixing two electrolytes [closed]

Suppose we have two 0.1M solutions in water. What is their conductivity and how will it change when we mix them, and why? A) NaCl and KCl: Okay, so both are strong electrolytes and conduct well but ...
1
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1answer
41 views

What citrate is a common anticoagulant?

When I underwent plateletpheresis, something that the staff called "citrate" was added to my blood as an anticoagulant. Everything I can find about this product online refers to it as just "citrate". ...
0
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1answer
34 views

Can the ions of dissolved salts be physically separated with a strong enough external electric field?

Say you had a arbitrary amount of sodium chloride dissolved in water. Could an external electric field (e.g. the electrically charged plates in Millikan's oil drop experiment) physically pull apart ...
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2answers
108 views

Why are some ions mutagenic and others are not?

It is my understanding that when ionic species (such as $\ce{He^2+}$, or alpha particles) enter the human body, they tend to react with biomolecules, causing damage by (for example) mutating DNA. If ...
3
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1answer
168 views

How can I interpret the CH4+ structure?

I am trying to teach myself about Electron Ionization, and am very confused about the formation of the CH4+ Ion. Do the dotted lines between the C and the H, and between the two Hydrogens indicate a ...
2
votes
1answer
37 views

How to determine net charge of a polycation using Wade's rules?

In order to determine the net charge of polycations, which adopt a Wade-like structure (octahedral, trigonal bipyramidal, ...), Wade's rules can be used. For example, the charge $x$ of the ...
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1answer
44 views

What does it mean when something is said to “contain ions”?

(I'm looking for a very basic level explanation because my only chemistry experience is one fast-paced high school course.) So, according to the professor of that course, ions are never found in ...
4
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0answers
42 views

What is the arrangement of water molecules in a hydration shell around an anion?

I believe I read somewhere that the hydration shell of ions always has hydrogen on the outside, but I can't relocate the exact whereabouts of this. Thus, I decided to ask here, as to what the ...
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0answers
36 views

How to divide the peaks of two anion ions using ion chromatography?

I used an ion chromatography system (Dionex IC-2000) to determine the inorganic ions and acid from the samples collected in the atmosphere. For measuring $\ce{SO4^2-, NO3, Cl-}$, and low molecular ...
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2answers
243 views

Formula of Manganese (IV) Ion

When determining the formula of manganese (IV) oxide, since it’s made up of $\ce{Mn^4+}$ and $\ce{O^2-}$ ions, why is the formula $\ce{MnO2}$ and not $\ce{Mn2O4}$? Any help would be greatly ...
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1answer
104 views

Very elementary question about valence electrons of ionic compound

In a university entrance question, I found this question: What is the number of valence electrons of $\ce{Mg(OH)2}$? Answer = 24 I know that Mg has 2 valence electrons and O has 6. But I don't ...
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0answers
17 views

How does a negatively-charged ion behave in the electrical field of biphasic systems

The following is the electrostatic potential plot along the z-axis in a liquid-liquid biphasic system (a ionic-liquid vs water). There are some negatively-charged ions in the positive side of z (z > ...
2
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0answers
53 views

Are dopant ions on a crystal lattice free or bonded?

This question seems simple but I don't seem to find many answers right away for this. When you make a crystal doped with ions (like a luminescent phosphor) and the ions then become a defect in the ...
4
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1answer
73 views

Can we manipulate the rate of water's autoionization?

I just got introduced to this concept and these thoughts came into my mind. Is there a way to increase the equilibrium constant of the autoionization of water?
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1answer
48 views

Is there a blanket term for all variants (both nuclides and ions) of a chemical element?

I'm hoping to catalogue the various nuclides and oxidation states of an element but can't find a single term that describes them all, save for "chemical element variations". Is there a specific term ...
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0answers
66 views

How would you write the empirical formula of an ion?

How would you write the empirical formula of e.g. X2Y42-?
6
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1answer
131 views

How are alkalide ions synthesized?

How are alkalide molecules synthesized, for example, I have read in a paper that the reaction $$\ce{2Na -> Na+ + Na-}$$ is exothermic with a $\Delta H = \pu{-438 kJ/mol}$. I have also read that in ...
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1answer
64 views

How does the water pollutant sodium nitrate affect the concentrations of other ions in tap (dam) water? [closed]

Context In my assignment I've been given two water samples from the hinze dam. The first sample has been untouched, however the second has been contaminated with an unknown ionic compound. To ...
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0answers
408 views

Compare stability of transition metal cations in aqueous solution

I have to compare the stability of the following transition metal cations: $\ce{Co^3+, Fe^3+, Cr^3+, Sc^3+}$ in aqueous solution. (Source: Joint Entrance Exam (JEE) 2013 Mains India) The first thing ...
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2answers
71 views

Do we consider the dissociation of water when dealing with ion concentrations of a solution?

One mole of hydrated copper(II) sulphate, $\ce{CuSO4 . 5 H2O}$, is dissolved in water. How many moles of ions does the solution contain? 1) 1 2) 2 3) 6 4) 7 The ...
3
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1answer
51 views

Extracting metallic magnesium from cholorphyll

My understanding is that when chlorophyll is exposed to an increased concentration of hydrogen ions (or rather the pH is lowered), the magnesium is displaced by a hydrogen ion and chlorophyll is ...
3
votes
1answer
69 views

Why does the helium hydride ion have such a large dipole moment?

According to Wikipedia, the helium hydride ion $\ce {HeH+}$ has a dipole moment of 2.26 or 2.84. What contributes to this large dipole moment in this molecular ion?
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0answers
46 views

Bond dissociation energy of the trihydrogen cation

Recently, in one of the questions in an assignment on the topic of energetics, we were asked to explain why the bond dissociation energy for the trihydrogen cation is much larger than what we would ...
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1answer
398 views

Does tetraoxidovanadium (VO4+) ion exist?

In my book (NCERT India), it is mentioned that: (page 224) ...$\ce{Mn2O7}$ gives $\ce{HMnO4}$ and $\ce{CrO3}$ gives $\ce{H2CrO4}$ and $\ce{H2Cr2O7}$. $\ce{V2O5}$ is, however, amphoteric though ...
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1answer
498 views

What is the difference between nuclear charge and ionic charge?

There was a question asking why magnesium metal has a higher melting point than sodium. In the answer, they said: Magnesium has more delocalised electrons. Magnesium ions have a greater ...
0
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1answer
44 views

How to determine which ions will pair to form a compound in an aqueous solution?

Let us assume we have an aqueous solution with the ions $\ce{A+}$, $\ce{B+}$, $\ce{C-}$ and $\ce{D-}$. Which ions will form a bond and why? Will the compound formed be $\ce{AC}$ and $\ce{BD}$ or $\ce{...
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0answers
48 views

Different values of concentration of product at equilibrium

$\pu{60g}$ of acetic acid and $\pu{46g}$ of ethyl alcohol are mixed with each other at a constant temperature and allowed to attain equilibrium. At equilibrium $\pu{58.2g}$ of ethylacetate and $\pu{...
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3answers
191 views

Are ions actually charged particles?

For instance, if an atom loses an electron and becomes a cation, such as sodium, how does that make the sodium atom positively charged? The sodium's atomic radii decreases due to less electron-...