Chemistry Stack Exchange
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Questions tagged [aqueous-solution]

For questions relating to compounds dissolved in water and resulting reactions and acid-base equilibria.

Water is colloquially known as the "universal solvent"; its polar nature and high availability make it central to many key biological processes and "everyday" chemical reactions. As such, many reagents used in the laboratory, especially in elementary chemistry, are typically dissolved in water.

In spite of simple formula, water displays highly complex behavior on molecular level - hydrogen bonding and autodissociation create various ionic clusters. Adding both ionic and molecular solutes further complicates attempts to characterise solutions, as water is a strongly solvating most of them, using a wide range of interactions.

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Is HCl (l) + H2O (l) equal to HCl (aq)?

The Wikipedia article about aqueous solutions claims that: An aqueous solution is a solution in which the solvent is water So basically, is writing $\ce{HCl(aq)}$ equal to: $\ce{HCl(l) + H2O(l)}$?
creekorful
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Preparation of iodine solution

How to prepare $\mathrm{0.1M}$ $\ce{I_2}$ solution. I have found in books that it should be prepared in $\ce{KI}$ solution but none of them explains why? Please explain in detail not just the procedure.
user3236187
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What is the process of turning ionic silver solution into colloidal silver solution?

I've looked at a number of different colloidal/ionic "silver solution generators." After my research I'm under a few impressions and if they're wrong please let me know. I also am wondering what the product is that one generator sells to add to…
hortstu
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How does the composition of ice differ from that of water in a partly frozen solution?

Take any solution, then start freezing it at sufficiently low temperature. Soon a small amount of ice forms. I'd like to know how the composition of dissolved salts and gases in the bit of ice differs from that in the water that's still liquid. …
Karolis Juodelė
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Hypochlorous acid mechanism

When hypochlorous acid is dissolved in water, is it the chlorine atom or the oxygen that serves as the anti microbial agent?
Richardbernstein
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Boiling solutions with two salts

If you dissolve two different ionic compounds (that don't make a precipitate) in water and then boil the solution so all the water evaporates, the salts will re-crystallize. Is it possible that you will get two compounds that are different from the…
roymend
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How do I prepare a 5N HCl solution?

I am trying to make 5N $\ce{HCl}$ solution. So far I understood that you need to get the molecular weight (36.5) and divide it by the number of $\ce{H+}$ that react in the acid-base reactions. The problem is that my $\ce{HCl}$ stock is 37 %. How…
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Storage life of 3% hydrogen peroxide

I am using 3% hydrogen peroxide for a series of operations, and the common practice is to prepare it on-site from 30% hydrogen peroxide and saline. This is time consuming and somewhat more prone to error than preparing a 3% stock. I was told this is…
TheChymera
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Non-hydrate forming salts?

Are there any water-soluble salts that don't form hydrates? Hydration seems very thermodynamically favorable, as evidenced by its abundance. It also makes sense since the solvation and hydration thermodynamics are related. I can't find any evidence…
ericksonla
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Would gas come out of solution in an infinite volume?

Say I have an infinite volume of water with some level of dissolved air in it. I lower the pressure to below the gas' saturation pressure. Does the air come out of solution if there are no interfaces (nuclei) for it to begin? If so, what is the…
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Measuring Colloidal copper PPM & how to ignore the salt PPM in soluton

I made some colloidal copper with 9V battery. To make this water I had to add small amount of salt. However, the salt itself shows up in PPM count of my PPM reader. So how can I discount the salt PPM and come up with correct copper PPM in distilled…
Alex
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Does magnesium sulfate in aqueous solution form magnesium (hydrogen-)carbonate when hydrogen carbonat is present?

I'm using an additive of magnesium sulfate to complement my fertilizer. The additive lists the following ingredients: I know that it does NOT contain magnesium oxide, because due to historical / commercial reasons ingredients of phosphorus,…
CuriousIndeed
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Solution of very small particles with neutral buoyancy and distinguishable to the naked eye

I'm trying to study the Tea leaf paradox, and asked a question about it on physics.stackexchange.com. To get further on the problem, I want to make a solution of very small objects in water that are distinguishable to the naked eye, and have (very…
Jostein Trondal
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Maintaining a 40% CO₂ aqueous environment?

I wish to grow algae in a 40% $\ce{CO2}$ (water under air with 40% $\ce{CO2}$ content) aqueous environment. Simple DIY methods are available, but they are generally unreliable (For more info on DIY read here) because they rely on a pH/KH…
Dale
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How do non-ionic compounds dissolve into water? Into molecules or atoms?

I can't seem to find the answer in google, which is surprising. I'm aware that ionic compounds dissolve into electrolytes. However, when non-ionic sacarose for example dissolves in water, does the sacarose crystals break into single atoms as well or…
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