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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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Iodine/iodide electrochemistry help

I have an electrochemistry experiment with iodine in solution. I am initially wanting to quantify the iodide in solution and extrapolate the concentration of I2(aq) and I3-(aq) in solution from this ...
ChemStudent24's user avatar
-1 votes
1 answer
85 views

Relative concentrations of ions in pure water with a pH of 7

Not a chemist here as the last Chemistry class I took was millennia ago, so please be patient with me. The Chem taught today is so different (and much harder) than I remember. So, regarding pure water,...
David Musoke's user avatar
1 vote
0 answers
68 views

Are there ionic compounds that dissolve in water but do not dissasociate into their ions?

I would assume such a molecule would be possible because polar ionic compounds have a partial charge that can help them dissolve in water yet not disassociate into their ion parts, but I am not sure.
Kryptic Coconut's user avatar
-1 votes
1 answer
77 views

Concentration of spectator ions halves?

I have a question below that I'm not too sure about. A precipitation reaction is caused by mixing 100mL of 0.25M $\ce{Na2Cr2O7}$ with 100 mL of 0.25M $\ce{Pb(NO3)2}$. The precipitate is filtered from ...
DialFrost's user avatar
  • 305
1 vote
1 answer
50 views

Resolve inconsistency regarding percentage of ionized water molecules in the auto-ionization of water

I am relearning some chemistry in order to understand pH for a particular application. My last encounter with the subject was in high school several decades ago. I have the following question: I read (...
skm's user avatar
  • 121
2 votes
2 answers
316 views

My textbook writes hydronium ion as [H(H2O)]+, is this correct? [closed]

[...] Thus, it bonds to the oxygen atom of a solvent water molecule to give trigonal pyramidal hydronium ion, $\ce{H3O^+}$ $\ce{\{[H (H2O)]^+\}}$ (see box). In this chapter we shall use $\ce{H^+(aq)}$ ...
Hdje's user avatar
  • 127
1 vote
2 answers
454 views

What is the hydrated diameter of a lithium ion?

When salts dissolve in water, the anions, cations, and strongly polar water molecules undergo hydration reactions, resulting in the formation of hydrated ions with a specific number of coordinated ...
陈永曜's user avatar
-1 votes
1 answer
66 views

Soluble Ion separation [closed]

Is it possible to separate ions dissolved in solution? I know that the charges have to be balanced, so thinking that maybe it is possible to artificially give that charge? Take for example, sodium ...
Trey Dean's user avatar
0 votes
1 answer
138 views

Mg2+ ion formation [duplicate]

Why does Mg not form a Mg+1 ion, even though its second ionization energy is much higher than the first ionization energy? (I know that an ion should resemble the noble gas closest to the element from ...
Saar Segen's user avatar
0 votes
2 answers
94 views

Does Cu+ have a greater ionic radius than Sr2+?

Although Strontium is in group 2, reducing the number of electrons as it becomes ionized makes it group 18, period 4 in terms of electrons. Therefore, ionized Strontium (Sr2+) is in the same period as ...
Woo Luke's user avatar
1 vote
1 answer
105 views

Cesium Chloride Density Gradient Centrifugation and Isotopes

In Cesium Chloride Density Gradient Centrifugation, as used by Meselson and Stahl, Cesium ions can be seen as strongly affected by centrifugation, so much so that they can overcome their ionic bonds ...
Young Jun Lee's user avatar
1 vote
0 answers
158 views

Aminium/Ammonium?

Chemdraw names this as 2-carboxyethan-1-aminium. Shouldn't it be ammonium? What's an aminium ion?
Arbish Ali's user avatar
-1 votes
1 answer
131 views

Why do samples of ionic compounds break into pieces, but the pieces do not combine into larger samples again?

A distinct property of ionic compounds is that they are brittle. We are taught this is due to the fact that when force is applied to the lattice, ions are shifted, resulting in positive ions repelling ...
Bobs's user avatar
  • 27
-3 votes
1 answer
288 views

Why does the oxygen in NaOH (sodium hydroxide) acquire an electron from the sodium if it's going to become unstable and give away the electron? [closed]

Mind you that the oxygen is already stable, having an even number of electrons and protons? Is the oxygen really neutral when it has an even number of electrons and protons?
Phillip Grigsby's user avatar
-2 votes
3 answers
297 views

Which part of a soap molecule is the hydrophilic part? [closed]

Is the hydrophilic part of the soap both the cation ($\ce{Na+/K+}$), just the $\ce{COO-}$, or both of those sections together like the picture shown below? Do the cation and the anion dissociate from ...
cabbagesss's user avatar
-3 votes
1 answer
106 views

Can acids contain OH-? [closed]

Given that a solution contains $\ce{OH-}$ ions can we sufficiently determine the substance is a base? From my understanding, an acid may still contain $\ce{OH-}$ ions. However, the concentration of $\...
user135170's user avatar
0 votes
0 answers
42 views

In a flame test, what is being excited? [duplicate]

I have done a flame test with $\ce{NaCl}$ and got the yellow characteristic flame of sodium. I am trying to understand exactly how this yellow color is being produced and when I searched for it, I got ...
Tuskies's user avatar
  • 35
7 votes
1 answer
389 views

Lewis Structure of the Guanidinium Ion

In a problem, I was asked to find the Lewis structure of the guanidinium ion $\ce{C(NH2)3}^{+1}$. I followed the following steps which led me to an incorrect structure and I was hoping someone could ...
Johnny Smith's user avatar
2 votes
0 answers
81 views

Brittle Properties of Ionic Compounds? [closed]

From my understanding, ionic compounds are brittle due to the alternating cations and anions within their lattice. Hence when stress is applied, similarly charged ions will repel causing the structure ...
Cot's user avatar
  • 37
-2 votes
3 answers
830 views

Why do we have to prevent the hydrolysis of iron(III) nitrate?

I want to make particular concentration of ferric ions from $\ce{Fe(NO3)3.9H2O}$, and then I found this video It says that we have to add nitric acid to prevent iron from hydrolysis, what does it mean?...
Muhammad Ihsan's user avatar
1 vote
1 answer
113 views

Can electrical conductivity be measured by colorimetric or photospectrometrical method?

I would like to measure electrolyte leakage from plant material after exposure to stress. Stress damages cell membrane integrity, resulting in efflux of intracellular components to the surrounding ...
Rivered's user avatar
  • 127
-5 votes
2 answers
69 views

Can you infer toxicity of an ionic compound based on the toxicity of its ions in other configurations?

Suppose I have two ionic compounds: "NaY" and "XCl". If these were both 'safe' to eat, would it be true that ...
alex_danielssen's user avatar
0 votes
1 answer
574 views

How does O2- have the largest radius [closed]

Why is the correct option O^2-, aren't all of them equal since they all have the same number of energy shells and same number of electrons in them
foozi2007's user avatar
0 votes
2 answers
239 views

Why ionic radius increases with negative charge?

Here's my understanding: An ion with a negative charge has gained electrons. Hence the negative charge. With a greater negative charge, there should be more attraction towards the positive charge. As ...
Quin Gardiner Bax's user avatar
-1 votes
2 answers
62 views

Number of neutrons in a chemical question?

Consider the equation $\ce{H2 + H2+ -> H + H3+}$ What is the atomic structure of the $H_3^+$ ion? I understand that the H$_3^+$ ion contains 3 protons and 2 electrons. However, how many neutrons ...
Dano's user avatar
  • 9
-3 votes
1 answer
165 views

How are polyatomic ions formed? [closed]

I know that there should be a covalent bond between polyatomic ions, such as $\ce{SO4^2-}$. But what causes it to suddenly gain electrons and become an ion?
gatiskandis's user avatar
-1 votes
1 answer
233 views

Lattice energy as a factor that helps determine which charge the atoms take on?

I do not quite understand the following line of reasoning: Why does Na not form $\ce{Na^{2+}}$ ions? To obtain $\ce{Na^{2+}}$ ions, the first and second ionization energy must be applied: 496 + 4563 ...
iwab's user avatar
  • 369
9 votes
1 answer
723 views

Why does the same electron transition release photons of different frequencies for some elements?

Question: For elements in the same period with different numbers of valance electrons, why does the same electron transition release photons of different frequencies? Example: For valance electrons ...
Bryan351018's user avatar
0 votes
1 answer
296 views

Most stable monoatomic ion of nitrogen [closed]

I often see that the most stable monoatomic ion of nitrogen is N$^{3-}$ (for example on Khan Academy), and I remember being taught something similar, along the lines of atoms wanting complete octets. ...
Furrier Transform's user avatar
-1 votes
1 answer
257 views

Is lead iodide a strong electrolyte?

So, lead iodide is insoluble. I see conflicting answers online. Some say it's a weak electrolyte because it is insoluble, others say it is a strong electrolyte because it is an ionic compound and any ...
blazerunner's user avatar
6 votes
2 answers
391 views

Does the MS oxygen peak at m/z = 16 correspond to $\ce{O+}$ or $\ce{O2^{2+}}$?

In a mass spectrum, while annealing with $\ce{O2}$ of a sample in UHV, I observe peaks at $m/z = 16$ and $32 (= 16 \times 2)$. While the latter is $\ce{O2^+}$, I'm unsure what the peak at $m/z = 16$ ...
P M's user avatar
  • 81
-1 votes
3 answers
277 views

Do polyatomic ions have oxidation numbers?

In a polyatomic ion, the sum of the oxidation numbers of all atoms is equal to the overall charge on the ion. However, does this polyatomic ion have an overall oxidation number? We also know that the ...
CaptainAmerica Whyso's user avatar
-2 votes
2 answers
483 views

Can ions be acids or bases?

Consider a sulfate ion, its considered a weak base. Yet I thought bases and acids were compounds meaning they were always electrically neutral? Why is a sulfate ion then considered a base? And how ...
Howard Stark's user avatar
0 votes
1 answer
163 views

Can two cations bond?

I want to know if you forced two cations together (maybe by heating it up in a plasma or something) would they bond and share atoms like in a covalent bond? What’s more, instead of taking just the ...
user11937382's user avatar
4 votes
1 answer
223 views

Do ion-exchange membranes *always* require ions to pass in both directions?

In an answer to this question, it was asserted that: Student always tend to forget that a solution must remain electrically neutral by all means. If you want a certain ion to leave water, you must ...
abligh's user avatar
  • 189
7 votes
1 answer
1k views

Is there a material that ions can pass through but water can’t?

I was wondering whether there is a material that can pass ions (such as the ions existing in seawater) but not water. I am aware that water molecules are smaller, so they can pass through some ...
Belal Bahaa's user avatar
-1 votes
1 answer
134 views

Why is desalination waste usually disposed back into the sea instead of converting it into chemical products?

I was reading about the desalination processes such as reverse osmosis and capacitive deionization and their alternatives. They all work on removing ions from water and disposing them back to sea/...
Belal Bahaa's user avatar
0 votes
1 answer
411 views

Why is it wrong to draw the Lewis structure of a molecule's atoms and then figure out the Lewis structure of that molecule

When drawing for example the Lewis structure of nitrate ion (NO3)^-1 whould it be wrong to draw nitrogen and oxygen separately and then try to figure out the structure of the ion? In that case does ...
CaptainAmerica Whyso's user avatar
-5 votes
1 answer
3k views

Why is ammonium ion net positively charged? [closed]

I know that this might look a very dumb question but I have been spent my days to think about it and couldn't understand and finally decided to ask. Consider Sharing of electrons to form covalent or ...
An_Elephant's user avatar
2 votes
2 answers
882 views

Will an electrolyte eventually stop conducting electricity? And if so, gradually over time or suddenly?

I understand that an electrolyte does not conduct electrons, but rather that the positive and negative dissolved ions are attracted by electric charge to the cathode and anode where they receive and ...
Antman's user avatar
  • 51
0 votes
1 answer
42 views

Dominance of electronic factors in cupric ion

I know that Cu+ ( cuprous ) ion is less stable than Cu²+ ( cupric ) ion . There are some reasons explaining this by high hydration enthalpies and low ionization enthalpies . Even though , these ...
Get_ Maths's user avatar
0 votes
1 answer
273 views

Can uv light cause heterolytic cleavage?

All sources I've read stated that UV-light can only cause homolytic cleavage (homolytic fission), producing radicals while not mentioning whether it was possible for it to cause heterolytic cleavage ...
boop's user avatar
  • 13
1 vote
1 answer
1k views

Why are hydrated lithium ions' radii larger than hydrated sodium ions' radii?

Why are hydrated lithium ions' radii larger than hydrated sodium ions' radii i.e. $r_\ce{Li+(aq)}>r_\ce{Na+(aq)}$? If ionic radii increase down the group i.e. $r_\ce{Li+}<r_\ce{Na+}<r_\ce{K+}$...
user avatar
2 votes
0 answers
165 views

How do the assumptions of the Nernst equation impact its accuracy?

I was just wondering what impact the assumption that the equilibrium membrane potential for an ion is dependent on just the ion itself (if it is the only thing that is permeable). For instance, if I ...
Ahmed's user avatar
  • 21
2 votes
1 answer
96 views

Which ion has a greater paramagnetic property?

I just recently began studying the Molecular Orbital Theory in Chemistry and I just learnt about the paramagnetic and diamagnetic nature of molecules based on their unfilled and filled orbitals. Now ...
noob anomaly's user avatar
-1 votes
3 answers
286 views

Do Ions with less stability have less energy of ionization than those who are stable?

Problem. I've come up with the strange example of the third energy of ionization of both $\pu{Mg}$ and $\pu{Al}$, the standard logic that is to be applied on any problem of "which element has ...
Acyex's user avatar
  • 133
12 votes
2 answers
806 views

Why are protons more common than hydride ion?

I'm a high school student. I noticed $\ce{H+}$ ion is commonly present in my books while I didn't find any presence of $\ce{H-}$ ions in my books. However, I found on internet that $\ce{H-}$ also ...
Oshawott's user avatar
  • 291
1 vote
2 answers
150 views

Find the ion with mass number 37 if the ion contains 11.1% more neutrons than the electrons

An ion with mass number 37 possesses one unit of negative charge. The ion contains 11.1% more neutrons than the electrons in its nucleus. An ion with a mass of 37 has % negative charge compared to % ...
user avatar
1 vote
1 answer
72 views

Thickness of proton exchange membrane (Nafion)?

I am looking into using a proton exchange membrane for a bio-energy cell experiment. Previous scholars have been using Nafion as a PEM to place between the anode and cathode (air-cathode). the ...
Anwar Elhadad's user avatar
-1 votes
1 answer
1k views

Why does acetate ion react with water? [closed]

When NaCl is added to water, it dissociates into $\rm{Na^+}$ and $\rm{Cl^-}$. The newly formed $\rm{Na^+}$ and $\rm{Cl^-}$ do not react with water. When $\rm{CH_3COONa}$ (sodium acetate) is added to ...
Nikhil Kumar's user avatar

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