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.

learn more… | top users | synonyms

0
votes
0answers
24 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 ...
0
votes
1answer
48 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. $$\ce{4(NH4) + 2 C2 +O4\rightarrow 4(NH4)2CO3}$$
1
vote
1answer
34 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 ...
1
vote
1answer
55 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.
2
votes
1answer
176 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 ...
1
vote
1answer
66 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 ...
1
vote
1answer
118 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 ...
1
vote
1answer
46 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?
5
votes
2answers
46 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
votes
1answer
64 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 ...
2
votes
1answer
51 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
votes
1answer
55 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?
1
vote
2answers
243 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 ...
3
votes
0answers
65 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+} + ...
1
vote
1answer
72 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:- ...
1
vote
1answer
43 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, ...
0
votes
0answers
63 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
votes
2answers
37 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
votes
1answer
56 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, ...
-1
votes
1answer
38 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, ...
2
votes
1answer
34 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 ...
1
vote
0answers
137 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 ...
2
votes
0answers
50 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 ...
3
votes
2answers
144 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)?
0
votes
3answers
123 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 ...
0
votes
1answer
107 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 ...
1
vote
3answers
437 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 ...
1
vote
1answer
109 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. ...
1
vote
1answer
62 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. ...
0
votes
1answer
79 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, ...
2
votes
2answers
251 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?
1
vote
1answer
239 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 ...
0
votes
0answers
26 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.
5
votes
1answer
246 views

What is the net ionic equation for this molecular equation?

I have this problem, Liquid bromine is added to a container of sodium iodide crystals I interpreted it with this molecular formula $\ce{Br_{2(l)} + 2NaI_{(s)} \rightarrow 2NaBr_{(s)} + I_{2(g)}}$. ...
3
votes
2answers
135 views

Which computational method/basis set should I use for small molecular ions?

I apologize for a perhaps newbie question. I would like to compute the potential energy surface for several small molecular ions, like $\ce{H2+}$ and $\ce{H3+}$, using quantum chemistry software. ...
2
votes
1answer
92 views

Why does sodium require energy to ionize?

If you look at $\ce{Na}$, it has a very low ionization energy, but the question is, why does it have an ionization energy at all? If it can get to the electronic configuration of $\ce{Ne}$, by losing ...
2
votes
1answer
244 views

Where does the extra electron go in ionic compounds?

In ionic compounds, where does the extra electron go? Or, in case of a cation, from which shell does it come? Consider, for example, $OH^{-}$, where did this extra electron go in the electronic ...
1
vote
1answer
91 views

How does water deionization process work?

What are the technical/scientific details behind the process of water deionization? How does deionization machines like those manufactured by Millipore work?
1
vote
0answers
52 views

Soil-solution cations in competition for exchange sites

How could one determine the likelihood of one cation displacing another on a negatively charged exchange site of a clay particle? For example, in a soil solution containing equal parts (by number of ...
-1
votes
2answers
54 views

A question about ions

Which ions do not react with each other in solution? A. $Ba^{2+},SO_4^{2-},NO_3^-$ B. $Cu^{2+},SO_4^{2-},OH^-$ C. $Ag^+,Cl^-,H^+$ D. $K^+,Fe^{3+},Br^-$ I have no idea why the ...
4
votes
2answers
180 views

How can potassium disappear after cooking?

I read this at this webpage: http://www.whfoods.com/genpage.php?dbid=90&tname=nutrient#impactcookingstorageprocessing How do cooking, storage, or processing affect potassium? Potassium ...
5
votes
2answers
1k views

Conducting current in electrolytes

I keep trying to figure out how current is conducted through an electrolyte but all I can find are BS half answers. They say the ions conduct, but the specifics are poorly explained or absent. I ...
1
vote
1answer
154 views

Why is there a charge on $\ce{COOH^{-1}}$?

The dissociation of formic acid ($\ce{HCOOH}$) is: $$ \ce{HCOOH -> H+ + COOH-} $$ Why is there a charge on $\ce{COOH^{-1}}$ though? Is it achieved through: $$1\times(\ce{C^{4+}}) + ...
1
vote
2answers
4k views

What is Molar Conductivity of an electrolytic solution

Please explain the physical meaning it carries ? And how is it that it can increase with dilution ? And why is it called Molar ? And what is equivalent conductivity ?
1
vote
1answer
2k views

How to get the valencies of elements?

How to find the valencies of elements by using it's distribution of electrons? Explain the method in simple words? Do you have to study the valencies or is there is a simple way of remembering? PS: ...
2
votes
3answers
90 views

If magnesium oxide is $\ce{2Mg + O_2 → MgO}$ then why is aluminium sulphate $\ce{2Al^{3+} +3SO_4^{2-} → Al_2(SO_4)_3}$?

Why is it not $\ce{Al_2SO_{12}}$? Why doesn't the 4 and 3 get multiplied? Show step by step working of formation of both $\ce{MgO}$ and $\ce{Al_2(SO_4)_3}$.
1
vote
0answers
62 views

In an acid, what does $\ce{ClO_3-}$ reduce into?

...but, most importantly, why? It's $$\ce{6e- +ClO_{3}^- +6H^+ \rightarrow Cl^- + 3 H_2O}$$ Now, with the gift of foresight, why was the equation for its oxidation not instead $$\ce {2e^- +ClO_{3}^- ...
1
vote
1answer
481 views

Coordination number of CsCl (high school chemistry)

Question: Suggest an explanation for the coordination number in the $\ce{CsCl}$ lattice being different from those in $\ce{NaCl}$. Standard answer: Caesium ion is larger than sodium ion, ...
0
votes
1answer
67 views

Trying to identify an ion

Could anyone identify this for me? It's from a quiz bowl clue that doesn't have the answer with it. "This linear polyatomic ion containing three atoms of carbon has a negative four charge and is only ...
1
vote
0answers
118 views

Selectivity Coefficients of Ion Exchange Resins - Selectivity Reversal with TDS / Ionic Strength

I'm currently studying ion exchange resins and generally getting a bit stuck on some points of information which I do not fully understand / are not very well explained within the literature. I ...