As of May 31, 2023, we have updated our Code of Conduct.

# 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.).

596 questions
Filter by
Sorted by
Tagged with
487 views

356 views

### Positive charge on a zwitter ion at pH=7?

I faced this question. But I am having some problems understanding the solution to this: How can the negative charge on the peptide vanish on $\pu{pH = 7}$? Suppose, we have some $\ce{H+}$ donor on ...
1 vote
2k views

### Calculate the molarity of Na+ ions in 20 mL of a .130 M solution of Na2Cr2O7?

The answer is $\pu{0.260 M}$, but I keep getting $\pu{0.0052 M}$ because I thought the right way to do it was by multiplying $\pu{0.130 M}$ by $\pu{0.02 L}$, then multiplying by $2$ moles of $\ce{Na+}$...
943 views

83 views

### What do we call ions without basic and acidic properties

According to Brønsted theory, Acids are substances (molecules and ions) donating $\ce{H+}$ Bases are substances (molecules and ions) receiving $\ce{H+}$ I've been trying to find a complete Brønsted-...
306 views

### Logical reasoning behind the formula for molar conductance of an electrolyte [closed]

I am studying some introductory material on electrochemistry. My book and all standard websites I've found define the molar conductance of an electrolyte as "conductivity of an electrolyte solution ...
3k views

### Why doesn't fluoride ion have highest nucleophilic power (nucleophilicity)?

As you can see from the image above, '$\ce{R3C}$' anion has 1 lone pair '$\ce{R2N}$' anion has 2 lone pairs $\ce{RO}$ anion has 3 lone pairs $\ce{F}$ anion has 4 lone pairs According to VSEPR theory,...
428 views

### Can atoms other than hydrogen be reduced to a bare nucleus?

In acid-base theory, hydrogen is able to become the $\ce{H+}$ ion, or a bare proton. I'm curious if other, larger atoms can have their electrons stripped to the point of being only a nucleus. I know ...
41 views

### Cyanamide mesomeric contributors

Which form of the cyanamide ion is more stable? As per the resonance rules, I find both of them equally stable as number of bonds is the same, more electronegative atom has negative charge and so on. ...
632 views

### Why is a cationic trialkylammonium functional group inductively withdrawing in nature?

The alkyl groups on the nitrogen ion should donate electrons (alkyl groups are electron donating in nature). So, irrespective of the nitrogen ion being a cation (which is an electrophile), the alkyl ...
697 views

### Relationship between the water ionization constant and ionic strength

I read in a textbook that the water ionization constant ($K_\mathrm{w}$) increases as the ionic strength of the solution increases and it confused me. If the ionic strength increased, then the ...
1 vote
618 views

374 views

### What makes certain zeolites better at ion exchange?

I would have thought that the bigger the pores in the zeolite, the more ions it can contain, and therefore the better the use of the zeolite for ion exchange. However, zeolite A has small pores but ...
1 vote
1k views

### Why is the inside of a cell both more acidic and more negative than its environment?

In a very simplistic way of thinking, an acidic solution has more positively charged $\ce{H+}$ ions present, whereas a basic solution has more negatively charged $\ce{OH-}$ ions present. Can that be ...
4k views

### Different types of carbides [closed]

I am confused between different types of carbides such as $\ce{CaC2}$, $\ce{Mg2C3}$, $\ce{Al4C3}$, $\ce{BaC2}$ or $\ce{BeC2}$. And if they are different, why they are called carbides?
3k views

### When, how & why do atoms become stable. If they're always bonding, do pure elements even exist in the real world? What happens to unstable atoms? [closed]

I really can't get my head around the fact that an element has to always become stable by bonding. Doesn't that mean that you can't actually find a pure element, and that it doesn't exist in it's true ...
207 views

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 ...
4k views

### Why second ionisation energy greater than the first?

Why is the second ionisation energy for atoms with more than 1 electron in the outermost sublevel greater than that of the first, if you are removing an electron from the same sublevel ? Why is there ...
4k views

### What is the size of a Sulfate ion?

In terms of nanometers, what would the size be of an individual sulfate ion in solution? Would its size exceed 0.5 nm? Enough to displace something that is held together with a gap of 0.35 nm?
1 vote
15k views

### why is tertiary carbocation more stable than primary allylic carbocation?

According to general organic chemistry the order of stability is as follows: aromaticity > resonance > hyperconjugation > inductive effect Since primary allylic carbocation shows resonance as well ...
3k views

### In which solvent is AgBr least soluble?

The solute $\ce{AgBr}$ is least soluble in A $\ce{H2O}$ B $1.0~\mathrm{M}\ \ce{FeBr3}$ C $1.0~\mathrm{M}\ \ce{CaBr2}$ D $1.0~\mathrm{M}\ \ce{AgNO3}$ I'm confused as to why the ...
1 vote
240 views

### Penta-valent ion in water?

I would like to have a solution with a pentavalent positive ion. I need something that, preferably in water: $\ce{XY -> X^5+ + Y^5-}$. What can XY be?
498 views

### Enthalpy change of chromate-dichromate reaction

I am a uni study doing chemistry. I have taken a little bit in highschool before, but not in a while. In a (nonassessed) practical, we have to predict how heating a chromate/dichromate solution: \...
21k views

### Why is the overall charge of an ionic compound zero?

My textbook simply says: Since an ionic compound consists of equal number of positive and negative ions, the overall charge of an ionic compound is zero. But why is the number of positive and ...
2k views

### How do you calculate the heat of a reaction given a table of heat of formation values?

So I've been trying to answer this question, and as far as I've learned it's $\Delta H^0_{\mathrm f}$(products)-$\Delta H^0_{\mathrm f}$(reactants), multiplying each by number of moles and such. ...
572 views

### Why does the trimethylammonium cation have a larger -I effect than the ammonium cation?

Why does $\ce{N(CH_3)_3^+}$ have a larger $-I$ effect than $\ce{NH_3^+}$? Since the methyl group is good at donating electrons it would stabilize the charge on nitrogen atom, decreasing its ...
1 vote
323 views

### Finding the concentration of ferrous thiocyanate in calibration solutions

Concentration of $\ce{Fe(SCN)^{2+}}$ in calibration solutions Recall that the concentration of $\ce{Fe(SCN)^{2+}}$ in the calibration solutions is essentially the concentration of the $\ce{SCN-}$ ...
1 vote
2k views

### How is the tetrachloridocobaltate(II) anion stable if its crystal field stabilization energy comes to be positive?

I tried to calculate the ligand field stabilisation enthalpy of $\ce{[CoCl4]^2-}$ (as shown in the image) but found it to be positive. What could be the reason behind this? How is it stable with ...
257 views

### How do I convert this ion exchange capacity into water softening capacity?

I am researching for an extended experimental investigation into methods of water softening. One such method is the use of ion exchange resin. I have contacted the supplier of the resin for its ...
1 vote
3k views

### Pattern to determine the maximum ionic charge for transition elements?

According to my textbook, main group elements follow a simple pattern when determining their maximum ionic charge. The maximum cationic charge is always equivalent to their main group number (group ...
744 views

### Comparing nucleophilicity

We have to compare the nucleophilicity of $\ce{OH-,NH2-,CH3CH2-}$ and $\ce{CH#C^{-}}$. I managed to find out that $\ce{CH3CH2-}>\ce{NH2-}>\ce{OH-}$ and that $\ce{CH3CH2-}>\ce{CH#C-}$. But I ...
1 vote
Wouldn't this be more stable if they stayed as neutral molecules? I've learnt that they will seek to reach the ratio of $[A]^a[B]^b/[C]^c$ that matches the $\ce{Ka}$ or $\ce{Kb}$ value. But I do ...