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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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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64 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
96 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 ...
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1answer
46 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
15 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 ...
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1answer
35 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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146 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 ...
2
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1answer
35 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
75 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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28 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
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1answer
32 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
36 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
65 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
338 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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128 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
45 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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118 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
26 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
71 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
41 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
61 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
286 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
101 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
563 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
108 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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50 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?
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1answer
95 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
61 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 ...
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1answer
66 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
2k 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 ...
4
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1answer
134 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
109 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
51 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
98 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 ...
2
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2answers
49 views

Notation of Beta decay

Is it an ion or a neutral atom that is created through Beta decay? For example: $_6^{14}\mathrm C \to ~ _7^{14}\mathrm N + \mathrm e^- + \mathrm{v{_e}}^{-}$ Isn't $_7^{14}N$ an ion since neutron ...
3
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1answer
87 views

Difference between sodium ion and a transition metal ion dissolving in water?

In class, I learned that when $\ce {NaCl}$ is dissolved in water, the partially negative oxygen part of the water molecules surround the Na+ ion and energy is given off (hydration enthalpy) Likewise, ...
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1answer
40 views

ions proportion [closed]

I have a precipitation reaction of this form: $\ce{Ca^{2+} + CO_{3}^{2-} → CaCO3}$ How many mole of $\ce{Ca^{2+}}$ ion is contained in a 200ml solution? I'd like to know how to calculate this, ...
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1answer
36 views

Isoelectric pH of colloids?

How did we derive the relation between the isoelectric pH and the dissociation constants for the amino and carboxyl groups on zwitterionic amino acids. $$pI=\frac {pK_{a1}+pK_{a2}}{2}$$ where ...
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0answers
180 views

Split carbonate ions?

Can you split carbonate ions into their constituent elements directly in the carbonate form? (so not first producing CO2 and then decomposing the carbon dioxide) (edit:) I know that when running ...
4
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1answer
80 views

Do chaotropic and kosmotropic affects occur in polar non-aqueous media?

For example can I introduce salts that have a chaotropic or kosmotropic affect on ethanol? Or is this phenomenon restricted to water? If this phenomenon does occur in other polar solvents, does it ...
4
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3answers
241 views

Evaporating the water of a solution of only carbonate ions and water gives?

I have a solution with only CO32- ions and water. What would happen with the carbonate ions if I were to evaporate the water of that solution (in vacuum)?
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3answers
166 views

Speed of ionic reactions?

Why are ionic reactions extremely fast, as compared to other gaseous reactions? The ionic reactions (precipitations, neutralizations etc.) are extremely fast (somewhere about $10^{12}$ times ...
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1answer
111 views

Ions and Polyatomic Ions

Before a sodium atom and a chlorine atom combine together to form the ionic compound $NaCl$, they are just neutral atoms. However, when an electron is transferred from the outer energy level of the ...
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3answers
745 views

Is ionic bond just formed by “electrostatic” interaction between two oppositely charged ions?

According to the definition of ionic bond: An ionic bond is a type of chemical bond formed through an electrostatic attraction between two oppositely charged ions. If we consider the above ...
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1answer
192 views

Are these the correct and complete net ionic equations?

So I have several descriptions of reactions and I have to give the net ionic equation. Are these just the equations or are they the proper net ionic ones? Solid calcium is added to warm water. ...
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1answer
75 views

why there is no simple rule to predict the possible ionic charges of element in middle of periodic table

I know element in left two columns have 1+,2+... and right ones 1-,2-. But in middle is all over the place. And with multiple charges. What defines that if this element is gonna have this charge. ...
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1answer
95 views

What is the charge on the copper ion in antlerite which is Cu3(SO4)(OH)4?

I'm trying to get the charge on the copper ion in this substance. So far I have the mass of 1 mole, percent oxygen content, and number of individual hydroxide ions in a 955 mg bead of the substance, ...
3
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2answers
362 views

Does the hydrolysis speed increase when more H+ ions are in the solution?

Does the hydrolysis speed increase when more $\ce{H+}$ ions are in the solution? So if I were to use $\ce{H2SO4}$ instead of $\ce{HCl}$ (same volumes) then $\ce{H2SO4}$ will be the most effective?
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1answer
413 views

Express the maximum work from a voltaic cell

The net cell reaction of an electrochemical cell and its standard potential is given below: $$\ce{ Mg + 2Ag+ ->Mg^{2+} + 2Ag} \ \ \ \ \ \ \ \ E^\circ=3.17\:\mathrm{V}$$ The question is to find the ...
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27 views

Is it practically viable to synthesise a salt composed of two different organic acids (as anions)?

In particular I'm curious as to whether a magnesium salt could be synthesised to contain one ionised molecule of folate and one ionised molecule of butyrate per magnesium cation.