Tagged Questions

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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33 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 ...
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34 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.
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1answer
23 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 ...
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1answer
56 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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23 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 ...
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1answer
92 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
44 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 ...
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1answer
51 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: $\ce{{}^{-}N=C=N^{-}}$.
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1answer
36 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 ...
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1answer
25 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 ...
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2answers
55 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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30 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?
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1answer
152 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
40 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 ...
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3answers
54 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?
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1answer
92 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 ...
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1answer
303 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
123 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
22 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
37 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?
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3answers
314 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 ...
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1answer
62 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 ...
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1answer
138 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 ...
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1answer
58 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) ...
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1answer
41 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 ...
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1answer
38 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 ...
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1answer
107 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 ...
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2answers
349 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
142 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 ...
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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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234 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 ...
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0answers
28 views

How to determine mineral properties based on chemical formula?

I need to learn a bunch of minerals and their properties. What I want is some sort of rule which helps me deduce color, crystal system, luster etc. I know that different kind of ions give specific ...
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1answer
121 views

Which salt precipitates from a solution of ammonium oxalate and silver nitrate?

I am supposed to write the precipitation reaction for $\ce{(NH4)2C2O4 + AgNO3 ->[\ce{H2O}]}$ Is my equation correct? I left out the Spector ions. $$\ce{4(NH4) + 2 C2 +O4\rightarrow 4(NH4)2CO3}$$
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1answer
43 views

Charge of polyatomic ions doesn't equal the charge of ions it consists of?

I'm taking entry level collage chem. class, and we got to this topic that I don't really understand. I think I understood what an ion is (a atom whose amount of electrons is not equal to amount of ...
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1answer
66 views

Is there a relation between the ionization energy and the electron affinity?

I am aware of the definition and equation of IE and EA. I was wondering if there is a direct relation between this two quantities with the energy of the neutral specie.
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1answer
602 views

How to chose wavelength in spectrophotometry? How to use Beer-Lambert Law?

How is the wavelength chosen to measure the concentration of an ion determined? and What does the wavelength correspond to in an atom/ion? When light is shined on a solution what happens to the ions ...
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1answer
104 views

Is ion activity in a salt solution pH-dependent?

:) Without being a chemist myself, I need some basic understanding of the ion activities in my buffer solutions. Now I am wondering whether the ion activity of the K$^+$ and Cl$^-$ ions is different ...
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1answer
1k views

NaH2PO4 in water : Acid/base?

Will $\ce{NaH2PO4}$ react as as an acid or a base if you make it react with water? I got stuck here. I can figure out the reaction: $\ce{NaH2PO4 + H2O -> Na^{+} + H2PO4^{-} + H2O}$ But when I ...
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1answer
208 views

Make tin nitrate?

How can tin nitrate be synthesized? Mixing nitric acid and tin makes tin oxide (I did this in chemistry class) so how can tin nitrate be created?
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2answers
58 views

Is it possible to create a salt with multiple anions with only one cation(e.g. CaBrCl)?

I know that usually more electronegative anions would displace less electronegative anions but is there a way to get different anions to "share" a cation?
3
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1answer
122 views

existence and stability of Bifluoride ion

Consider the following homework question:- Statement 1. The $\ce{HF2^-}$ ions exist in solid state and also in liquid state but not in aqueous state. Statement 2. The magnitude of ...
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1answer
70 views

Solution containing Iodine

The question is:- Iodine dissolves in a variety of solvents forming solutions that are purple, brown or any intermediate shade. This property is due to:- Hydrolysis of iodine ...
0
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1answer
71 views

How to determine the reaction of a strong electrolyte?

I'm told the $\ce{KMnO4}$ is a strong electrolyte. How can I figure out how the reaction looks like?
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2answers
6k views

What are the products of the dissociation of NaHCO3 in water? What is the relative pH of the solution?

I had a recent question on a test that asked what the products would be if Sodium Hydrogen Carbonate were dissolved in water. I had a few candidate answers $\ce{NaHCO3}\rightarrow ...
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1answer
163 views

Variable oxidation state of transition metal ions

Transition metals can form stable ions with different oxidation states. But I am confused why doesn't only the most stable state exist. Let me clarify my question more: $$\ce{Ti^{2+} -> Ti^{3+} + ...
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1answer
162 views

Calculating approximate pH of polyprotic acids

When I took up ionic equilibria and titrations after a long break, I found it hard to solve the questions regarding pH calculations of polyprotic acds. Consider these two questions as examples:- ...
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1answer
66 views

Which ions are accounted for in total and net ionic equations?

There are a number of things I don't understand about ionic equations. First off, when you do net ionic equations, is it correct that you're only focusing on precipitates? The way I understood it, ...
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0answers
125 views

Converting sulfate ion to sulfur trioxide?

I have a solution of only Sulfate ions (no other positive ions belonging to the sulfate ions because the positive ions are attached to the intermediate in a catalytic reaction) I want to convert ...