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Questions tagged [aqueous-solution]

For questions relating to compounds dissolved in water and resulting reactions.

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487 views

Can metal oxides react with water to form a hydroxide, then that with HCl to make a salt?

Lets say I have a metal oxide and I put it in water, and it reacts. As far as I know, only metal oxides from group 1 and 2 react in water, making hydroxides. Now here is my question: If I add HCl ...
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455 views

How to correctly prepare a standard solution?

Having just spoken to my teacher about the creation of a standard solution, and she suggested one way of doing it, however a previous chemistry teacher had told us a different way of doing it. My ...
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199 views

Will a film of oil on water retard evaporation (of water) and prevent air and atmospheric impurities from diffusing into it?

I vaguely recall hearing that a layer of oil on water will slow down the evaporation of water, as well as serving as a barrier that would prevent (or retard) the diffusion of air and atmospheric ...
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886 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 $\ce{Na+}$...
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139 views

How to solve for concentration of two equilibrium reactions with finite equilibrium constants?

I have a small problem of equilibrium that I counldn't solve. I want the exact answer. No approximations please. $$ \begin{array}{ll} \ce{H2O + H2O <=> H3O+ + OH-} &\quad\left(K_w = 1\cdot ...
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How do I measure out these salts using the proper method?

I'm planning on preparing a water solution using the following salts of reagent grade with approximately these concentrations: \begin{array}{lr} \ce{CaCl2} & \pu{10 mg/L}\\ \ce{Na2SO4} & \...
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Are the pKa or pKb from KH2PO4 the same as H3PO4?

EDIT: Ivan Neretin argued that for the constant holds no importance in the equilibrium of an acid-base buffer situation. That way, there is no need for a dissociation constant because the equlibrium ...
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234 views

How do you neutralize pH of a solution by not knowing concentration [closed]

If I had a pH 10 in a 100ml solution of water and 93% sodium hydroxide how much mg/l of 93% sulfuric acid would we need to use to reach a pH of 4. From my dated college chem books and a lot of google ...
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1answer
215 views

Formation of MnO2 vs [Mn(H2O)6]4+ in aqueous solution

I am looking for reasons why $\ce{Mn(IV)}$ wouldn't be stable as a hydrate. I know that from standard reduction potentials it exists as a ppt of $\ce{MnO2}$, but what is stopping it from being a ...
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1answer
379 views

What does “percentage by mass” mean in the context of a compound dissolved in a solution?

Copper can be recovered from low-grade ores by 'leaching' the ore with dilute $\ce{H2SO4}$, which converts the copper compounds in the ore into $\ce{CuSO4(aq)}$. In a $\pu{50 cm^3}$ leach solution, ...
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476 views

How can I separate sodium ions from brine or molten NaCl?

Is possible to separate sodium ions from an aqueous solution of NaCl? If so, how do I go about it?
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59 views

In this specific case is the proton considered product or catalyst?

Assuming we have a reaction of $$\ce{CO2 + H2O -> HCO3- + \color{red}{H+}}$$ then is the proton (in red) is considered a product or a catalyst? I read the Wikipedia article titled Product (...
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1answer
1k views

How can I predict whether a reaction will occur? [duplicate]

I'd like to know how can I predict if two substances will react. I already know that there's a reaction if one of the products is a weak electrolyte or a precipitate but that leads me to the question: ...
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Will this reaction form magnesium carbonate?

I have magnesium oxide pills I take. I know if I dissolve them they'll form magnesium hydroxide, and I'm trying to make pure magnesium from my pills. I've come up with a double replacement reaction, ...
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1answer
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Crystallisation and crystal surface

It is my understanding that if you put table salt (as an example of polar compound) in water, the Na+ and Cl- ions will freely move through the solution. They will make the solution conductive and ...
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2answers
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Why is sodium carbonate less soluble in water than sodium bicarbonate?

Why is sodium carbonate less soluble in water than sodium bicarbonate? If you think about their structures, the only thing that is different is that sodium carbonate has two sodium atoms, while sodium ...
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1answer
196 views

Can Aquatabs be used to clean swimming pool water?

Can Aquatabs be used to prepare/chlorinate water for swimming? They are used to clean water for drinking so is it safe to assume that if used in proper quantity they can also clean water for ...
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102 views

Adding ethanol to louche

I'm watching MIT chemistry by Donald Sadoway. In one of his lectures devoted to solutions and phase separation, he performs experiments with absinthe. First he mixes absinthe with 5 $\times$ water ...
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Could stabilized aqueous ozone be bottled to prevent half life/sanitization window?

Could stabilized aqueous ozone be bottled to prevent half life/sanitization window? Typically upon creating stabilized aqueous ozone, it has a shelf life and a sanitization window of 24 hours from ...
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1answer
76 views

Will the concentration of 3% w/v H2O2 be lowered after 3 weeks?

I have read online that $\ce{H2O2}$ decomposes if exposed to sunlight and air. If this is the case then will the concentration of 3% w/v of $\ce{H2O2}$ be lowered if it is left out in the open at ...
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1answer
577 views

What is the difference between balancing a redox reaction in acidic solution vs basic solution?

I'm asked to balance the potassium permanganate and hydrogen peroxide reaction. I misread the problem and thought that the reaction was in acidic solution. This is the result that I've got: $$\ce{...
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3answers
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If you add AlCl3 to water, why does the pH decrease?

You are not adding any hydrogen ions, so why does the pH of the solution decrease? Thank you in advance. EDIT: I will add the context of my asking this question to clarify some details. This is not ...
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2answers
226 views

Vapor Pressure Paradox

This is quite an interesting situation I had thought of. Consider two beakers, each containing $\pu{180 g}$ of water. Also, suppose one of the two has $\pu{1.8 g}$ of glucose dissolved in it. Let's ...
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2answers
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Is lithium bicarbonate an aqueous solution of lithium carbonate?

This question is related to: Are Lithium bicarbonate and​ Magnesium bicarbonate both soluble in water? What type of chemical reaction is this? How can bromine water be called a solution? In the ...
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1answer
127 views

If A reacts with B (aq), does that mean it is soluble in it?

For example, ethanol is soluble in water, but doesn't react with it. On the other hand, H2SO4 is said to be soluble because it dissociates (reacts) in water. Would ethanol be soluble in HCl (aq)? It ...
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1answer
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How does the HCl-KCl Buffer work?

I have just been studying the $\ce{HCl}$-$\ce{KCl}$ 'buffer', but there are still quite a few things I am uncertain about. I would appreciate any help in clearing up some questions I have. What I ...
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1answer
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Why doesn't frozen sugar solution taste sweet?

I'll try to make this as brief as possible: Dissolved two teaspoons of table sugar (sucrose) in about 250ml water. Sipped it, and as expected it tasted sweet. I let the rest of it sit in the freezer ...
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2answers
7k views

Why bother to standardize a solution?

I have been preparing lessons for some of my students about preparing acidic and basic solutions, and I keep finding pre-made labs in which the students "standardize a basic solution" by titrating it ...
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0answers
100 views

Where is my antimony going?

I work in a trace metals laboratory operating an ICP-OES. I've been having some trouble with the recovery of antimony in a weak $\ce{HCl}$ solution post-digestion. The antimony is part of a mix of ...
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1answer
179 views

Sodium Silicide (NaSi) Synthesis, Reversability

I'm trying to understand a) the reaction that would produce $\ce{NaSi}$ from $\ce{Na}$ and $\ce{Si}$, as well as how to reverse the reaction of $\ce{NaSi}$ with $\ce{H2O}$. The product of the latter ...
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804 views

Making artificial sweat

I'm currently working on a chemistry investigation wherein I need to dilute a compound with artificial sweat. I have looked at various forums, including this, which gave answers, but is very outdated. ...
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1answer
677 views

Conversion of Kc into Kw

In deriving the expression for $K_\mathrm w$, we often start with the equilibrium equation of water $$\ce{H2O <=> H+ + OH-}$$ The $ \rm K_c$ expression is quoted as $$K_\mathrm c = \frac{[\ce{H+...
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2answers
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Can sodium bicarbonate be considered an acid?

I was reading about acids and bases today and finally decided to question the statement that "baking soda is a base." Let's start with the dissolving of baking soda, $\ce{NaHCO3}$. The equation to ...
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1answer
298 views

Does addition of HCl favour, or disfavour, formation of tetraamminecopper(II)? [closed]

Which way does the equilibrium $$\ce{[Cu(H2O)4]^2+(aq) + 4 NH3(aq) <=> [Cu(NH3)4]^2+ (aq) + 4 H2O (l)}$$ shift if HCl is added to the system? When I did this experiment, I found that the ...
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Can other substances be dissolved in a saturated solution?

If I have a liter of water fully saturated with sucrose would it be possible to dissolve something like salt or any other substance in the water? Or when the solution is saturated, is it impossible to ...
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323 views

Dielectric constant and dissolution of ionic salts

We say that salts like $\ce{NaCl}$ get easily dissolved in water because the dielectric constant of water is very high. I know the dielectric constant of water is 81 and if a salt is put into water ...
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1answer
66 views

A titration mixture having pottasium oxalate and pottasium hydrogen oxalate!

I came across this question, this is how it goes- A solution is prepared by dissolving a solid mixture of $\ce{K2C2O4}$ and $\ce{KHC2O4}$. A $\pu{10 ml}$ portion of this solution required $\pu{10 ml, ...
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614 views

Why isn't mercury electrode used to produce commercial element sodium?

I know that while electrolysing a solution of brine, if we use mercury cathode, we get sodium amalgam instead of having hydrogen gas liberated. Even the Castner-Kellner process uses this to produce ...
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2answers
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Definition of “soluble” [closed]

How to define "soluble" in chemistry? For example, in 1:1 v/v, benzene does not mix with water, i.e. insoluble. Common sense. However, in an analytical procedure, it called for making a "saturated" ...
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2answers
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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-...
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1answer
260 views

How does adding acids (H+ ions) to limited soluble salts help it further dissolve?

For example, adding $\ce{HCl}$ to the very insoluble $\ce{CaF2}$ will help it further dissolve. How? I believe the concept deals with equilibrium and Le Chatelier's Principle: $$ \ce{ CaF2 <=> ...
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2answers
1k views

pH probe bulb - what is happening within the glass?

I am trying to understand how the glass bulb of a pH electrode of a pH meter works - the glass bulb itself. Not the reference electrode or the rest of the electrode (HCl, Ag/AgCl wire, etc...), the ...
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0answers
838 views

Why do fluoride ions “win” over thiocyanate ions in a solution with iron ions?

When you mix aqueous iron(III) nitrate and potassium thiocyanate together you get a red solution. Then if you add sodium fluoride, the red colour disappears. This is basically because the $\ce{Fe(...
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1answer
731 views

How do hydrogen bonds break the ionic bonds of a crystal lattice? [duplicate]

In the case of water dissolving sodium chloride. I was under the impression that hydrogen bonds were much weaker than the ionic bonds in sodium chloride, so how do they overcome the ionic bond ...
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1answer
124 views

Speed at which methanol dissolve in water?

Suppose that in a container of volume V we pour V1 of methanol and V2 of water (V2>V1), supposing that V2 is big enough that all the methanol will be dissolved, do we have to mix them mechanically or ...
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81 views

Osmotic pressure and Raoult's law co-relation?

Consider two compartments A and B joined. A contains pure water. B contains brine (dilute). Consider the Vant Hoff factor ($i$). Obviously pressure over B is less than over A. We also know that the ...
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1answer
2k views

If I mix carbon dioxide and sodium hydroxide in the right amounts in water, do I get baking soda?

Suppose I need a sodium bicarbonate solution (for non-food related reasons). Can I get something resembling it by mixing $\ce{NaOH}$ and $\ce{CO2}$ in water? Of course one should not attempt to make ...
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1answer
1k views

Distillation of aniline/water mixture

I read from a source that aniline and water can be separated by steam distillation. But isn't this senseless as steam distillation will simply add more water and make separation more difficult?
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1answer
288 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 ...
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1answer
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Which is more soluble in water, HF or SO2?

I was wondering which is more soluble in water, hydrogen fluoride or sulfur dioxide? Since $\ce{HF}$ will hydrogen bond to other HF particles (as opposed to $\ce{SO2}$ dipole-dipole attraction). ...