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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53 views

What kind of carbon ions exist?

I think there are $\ce{C^{4-}}$ and $\ce{C^{2-}}$ existing. How can we find the charge of ions in the elements? Should we look at the group or valence?
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0answers
11 views

How to find the ions of transitive metals? [closed]

For example find the ion of Z=51 and of Z= 27. I don't know what method should I use. For example should it be kathion $$ X^2$$
3
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2answers
66 views

Where does the Fe(III) ion go?

Iron(II)Sulphate solution is added to a test-tube. Following this, potassium manganate solution is added gradually to the test-tube as well. The observation seen is that the green solution turns pink ...
3
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0answers
22 views

Does Iron (III) Sulfate react with copper?

As my understanding, there should be an oxidation-reduction reaction: $$ \ce{2Fe^{3+} + Cu \rightarrow 2Fe^{2+} + Cu^{2+}} $$ However, I always see the process using $\ce{FeCl_3}$ to etch ...
0
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1answer
35 views

Why they have different flame colour?

At school, I learnt about the metal and their flame colour. Here's my observations. $\ce{K^+}$- Lavender $\ce{Ba^2+}$- Yellow-Green $\ce{Ca^2+}$- Yellow-Red $\ce{Li^+}$- Flame Red $\ce{Na^+}$- ...
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0answers
19 views

How to determine relative size of polyatomic ions?

How would you determine the size of a polyatomic ion? For example when determining which ion is bigger, NH2- or I-, what would you use to determine the size difference? I know that I- would be much ...
2
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1answer
53 views

Why is the hydride ion negative?

Recently, I saw a video about sodium hydride and it saw it was made up with $\ce{Na+}$ ions and $\ce{H-}$ ions. My problem is: aren't all hydrogen ions positive? And in what conditions can $\ce{H-}$ ...
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2answers
40 views

What is the bonding picture in Peroxomonosulfate?

In $\ce{SO5^{2-}}$, can somebody tell me which orbitals are used to form the pi bonds in this anion. Please tell the hybridization. And the lewis structure. Well I tried and the answers I got was sp3 ...
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1answer
21 views

number of ions present from moles

I have $0.0585$ moles of $\ce{Al^{3+}}$, and need to find the number of actual ions. I thought I just divided by $6.022\times 10^{23}$ but I get $9.7\times 10^{-26}$, and the book says it should be ...
4
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2answers
78 views

Should I use H3O+ or H+?

I learned the equation $$\ce{H2O + H+ -> H3O+}$$ And I know $\ce{H^+}$ and $\ce{H_3O+}$ are the same. But I am confused as to when can I use $\ce{H^+}$ and $\ce{H_3O+}$?
0
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1answer
62 views

How would you find the mass in grams, if you only know the number of particles of a portion of the formula?

If you were given a question like below: What is the mass in grams of a sample of $\ce{Fe2(SO4)3}$ that contains $3.59 \times 10^{23}$ sulfate ions, $\ce{SO4^{2−}}$ ? The molar mass of ...
2
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1answer
29 views

How thermochromism happen?

I learned that when $PbO$ is hot, it is orange. When $PbO$ is cold, it is yellow. I know this's called thermochromism. But how do that happen? Is it because the ions inside doing something?
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1answer
36 views

What is the difference between carboxylate ions and groups?

I would like to know the difference between carboxylate ions carboxyl groups? An example is is $\ce{COOH}$ and $\ce{COO}$.
3
votes
1answer
30 views

Why do strong acids dissociate (almost) fully on a molecular level?

In the Brønsted-Lowry theory, strong acids $\ce{HA}$ dissociate using water and react into hydronium ions and the conjugate bases $\ce{A-}$. However I never understood in the strong acids case what ...
5
votes
2answers
84 views

Why the salts in a salt bridge?

Take the example of a copper and zinc galvanic cell, connected by a salt bridge of $\ce{KNO3}$. I understand how the reactions will result in positive and negative charges, and that the ions of the ...
0
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1answer
49 views

What happens when oxidizing Ni(OH)2 with a strong base?

In an aqueous solution, Nickel oxyhydroxide is oxidised with a 1:1 ratio of aqueous Sodium hydroxide. My goal is to produce Nickel oxyhydroxide ($\ce{NiOOH}$). Strong Base: $\ce{NaOH + H2O ...
0
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0answers
33 views

Why is the sodium +1 ion larger than the neon atom?

Why is the sodium +1 ion larger than the neon atom? The removal of the electron from sodium should cause the ion to be the same size as the neon atom.
1
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1answer
100 views

How does a limiting reactant relate to the concentration of ions in solution?

Given the question A sample of 1.50 g of lead(II) nitrate is mixed with 125 mL of 0.100 M sodium sulfate solution. What is the limiting reactant in the reaction? Calculate the concentrations of ...
0
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1answer
65 views

Structures of Thiosulfate, Dithionate & Tetrathionate Ions [closed]

I am trying to find the structures of thiosulfate, Dithionate & Tetrathionate Ions but I am not getting an exact answer. Please help.
3
votes
1answer
24 views

A metal Q forms a carbonate and a nitrate. What is the molecular formula of the nitrate of Q?

Good day. This is my first post in any chemistry site. A metal $\ce{Q}$ forms a carbonate and a nitrate. The molecular formula of the carbonate of $\ce{Q}$ is $\ce{QCO3}$. What is the molecular ...
0
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1answer
130 views

Why has lithium bromide a slight solubility in organic solvents?

Why has lithium bromide a slight solubility in organic solvents? Theoretical, LiBr is an ionic compounds, so it should be only soluble in polar solvent like water. But why is it soluble in others?
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0answers
26 views

Kinetics of the conversion from metal oxide to metal hydroxide in water

How long can a metal oxide such as magnesium oxide remain in solution before being converted to the metal hydroxide?
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4answers
2k views

Why does salt dissolved in water taste like salt? If it's just Na+ and Cl- ions

When NaCl is dissolved into water it breaks down into Na+ and Cl-. It stays in this form until the water evaporates and then the ions go back to normal NaCl. So why does water with salt in it still ...
3
votes
1answer
96 views

Proton affinities in machine readable format?

Short: How to get proton affinities for a large list of chemicals? A database? A programming API? Longer: I have ca. 2000 chemicals (downloaded from MCM, mostly organics that occur in the atmosphere ...
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1answer
48 views

Potassium Atom can act as reducing agent, yet ion cannot?

I am currently looking through a revision sheet, however it has caught me on a question 'Explain why a potassium atom can act as a reducing agent yet a potassium ion cannot'. I have done brief ...
4
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1answer
63 views

Unknown anion (one carbon and two nitrogen atoms, charge 2-)

What's the name of this ion: $\ce{CN_2^{2-}}$? I think that it has this structure: $\ce{{}^{-}N=C=N^{-}}$.
2
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1answer
67 views

Net ionic equation with only aqueous ions

When you turn a balanced equation into a net ionic equation, you ignore all the ions that are spectator ions (aqueous on one side as well as the other). You only write the solid and the aqueous ions ...
0
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1answer
27 views

Chemical nomenclature of ions

I'm a very beginner in chemistry. The book I'm studying says that an ion is an atom, or a collection of atoms, that has an electric charge, then it writes about the difference between molecules and ...
3
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2answers
64 views

Why does water break salt really

A kid asked me this question just the other day, and I said that the positive part of $\ce{H2O}$ attracts the negative $\ce{Cl}$ ion and the negative part of the $\ce{H2O}$ attracts the positive Na ...
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2answers
31 views

Can citric acid protonation produce benzene and water

Is this reaction possible: $\ce{C6H8O7 + 12 H3O -> C6H6 + 19 H2O}$? Considering that the $\ce{H+}$ can be induced by ionization of the citric acid solution the benzene can be produced in this way?
8
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1answer
203 views

Explaining Ionization to kids

I have a quest to explain a physical, chemical theory to kids of age 8-12. The topic is "Ionization". We all understand from early experiments of Physics and Chemistry (the Millikan oil drop ...
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0answers
45 views

Is Oxide Anion more stable than O^+

O likes to be negative if charged at all. Most metal oxides are of the form $\ce{A^{x+} O^{2-}_{x/2}}$ (where $x$ is the magnitude of the positive charge and $\ce{A}$ is a metal.) Here, despite the ...
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1answer
28 views

Balancing ionic equations and determining number of ions

There were two questions that I've listed below that I've had troubles on. I got an answer in both, but both of them weren't correct. For the first question, they list the answer to be D and then ...
0
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3answers
55 views

Why cellphone batteries are still bad?

There are constantly new features in cellphones over the years, but it seems like batteries are not getting any better. Why is that?
4
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1answer
123 views

Why Aren't Chlorides Of The Noble Gases As Prevalent As Their Fluorides?

I can't find the answer to this question on this SE website, and I apologize for the repetition if it has been answered before. It is my understanding that compound formation has only been observed ...
3
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1answer
700 views

Is there an easy way to remember charges on ions?

I have a chemistry test coming up and I might need to know the charge that goes with the different ions like $\ce{SO4}$ has $-2$, $\ce{NO2}$ is $-1$ and $\ce{PO4}$ is $-3$. Is there an easy way to ...
2
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1answer
252 views

What is the simplest structural unit of an element or compound?

From "Smarter than a 5th Grader": What is the simplest structural unit of an element or compound? molecule, atom, neutron, proton For covalent compounds, the answer would ...
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0answers
30 views

What is electrodialysis and is electrolysis prevented or suppressed?

Recently, I was introduced to a method of desalinization called electrodialysis in which a current was applied to salt water in such a way that the positive and negative were separated and drawn ...
2
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1answer
43 views

why is potassium the most free element in most of plants

Potassium is known to be the most freely available mobile element. I am wondering why that is the case? Is the answer hidden in its atomic structure or its monovalent cationic existance?
5
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3answers
792 views

Bonding in the phosphate ion

I'm looking for an explanation of the bonding in the phosphate (PO43−) ion: (Image courtesy of Wikipedia) Phosphorus (15P) - being the fifteenth element - has fifteen electrons, five valence ...
3
votes
1answer
65 views

In a redox reaction, why does more than one oxidation state of an element form?

Consider the reaction 100ml 10M $\ce{NaOH_{(aq)}} +$ 100ml 10M $\ce{NaHSO3_{(aq)} +}$ 100mL 0.01M $\ce{KMnO4_{(aq)}}$ In the picture posted here, the left columns give information on the Molarity of ...
0
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1answer
234 views

Why does calcium carbonate decompose into calcium oxide?

Why does calcium carbonate, when heated strongly, decompose into calcium oxide and carbon dioxide? What is the mechanism? Can someone illustrate the means by which this happens? What ...
5
votes
1answer
61 views

Which ion of iron to use?

The instructions ask to write a balanced equation for: $\ce{Iron(s) + copper(II) sulfate(aq) -> \;?}$ If I used Iron(II) I get: $\ce{Fe + CuSO4 -> FeSO4 + Cu}$ and if I used Iron(III) ...
3
votes
1answer
44 views

Behavior of NaCl in water with electrodes

If I had some NaCl dissolved in water, it is conductive, so if I were to put two electrodes in the container (powered), what is causing the flow of electrons? Do the NaCl ionic bonds break and the ...
0
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1answer
40 views

$\ce{O^{2-}}$ Anion in Redox - Origin?

How come the oxygens transferred in redox reactions are always the $\ce{O^{2-}}$anion? For example, I have this set of rules, and the rules are implicitly referring to the $\ce{O^{2-}}$ anion, a ...
1
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1answer
114 views

How to calculate the number of moles present in a litre of saturated solution?

The solubility product of a salt having same molecular formula as $\ce{Ca_3(PO_4)_2}$ is $1.08\cdot10^{-28}$. Then find the number of moles of ions present in the saturated solution. My approach: I ...
3
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2answers
368 views

Why oxygen is enclosed in parenthesis in some chemical reaction?

While going through my chemistry text book I came through the following reaction. $\ce{RCH2OH + (O) -> RCHO + H2O}$ In the above reaction why oxygen atom is enclosed in parenthesis ?
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2answers
158 views

Identify this ion

These are the results I got for my experiment. I'm having trouble interpreting the results. As you should be well aware of, Lithium and Strontium both burn with crimson red when they are placed in a ...
0
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1answer
46 views

Dissociation of ligand

If a ligand K[Ag(CN)2] is dissociated.. Which one is correct dissociation equation? $$\ce{K[Ag(CN)2] -> K+ + Ag+ + 2CN^-}$$ or $$\ce{K[Ag(CN)2] -> K+ + [Ag(CN)2]^-}$$
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3answers
370 views

K2SO4 and KSO4-, why can't it exist? [closed]

Can someone explain to me why $\ce{KSO4^-}$ doesn't exist (in a solution). Why can't it exist? I couldn't find an answer; I assume if you took one $\ce{SO4^{2-}}$ and one $\ce{K^+}$ ion, only that one ...