For questions related to the solubility of compounds in various solvents, especially in water.

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-2
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0answers
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removeable polymer coating

i need an removable polymer coating material should have following properties:- Fast drying time (without any hardener) Elasticity Spray-able Transparent Polyurethane Thinner-base Peel-able ...
2
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1answer
61 views

What is a strong base?

How come that some insoluble compounds in water, e.g. $\ce{Mg(OH)2}$, $\ce{Ca(OH)2}$, $\ce{Sr(OH)2}$ are considered strong bases? Are they even strong bases? How can I tell if a compound is a strong ...
3
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0answers
49 views
+100

UV curable adhesive

I'm looking for a UV curable adhesive that can be removed without peeling or burning. Ideal removal would be some kind of solvent over a relatively short period of time. I also need it to have a ...
1
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1answer
37 views

Iodometric titration of copper - standard electrode potentials

Upon inspection of the standard electrode potentials for the half reactions for both $\ce{Cu^2+}$/$\ce{Cu+}$ and $\ce{I2}$/$\ce{2I-}$, it becomes apparent it should be the iodide ions that act as the ...
0
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3answers
79 views

What does CH4 form when dissolved in aqeous solution?

So I understand $\ce{CH4}$ has a low solubility, but when it does dissolve, what does it form? E.g. $\ce{HCl_{(g)} + H2O -> H3O+_{(aq)} + Cl^{-}_{(aq)}}$. So what does $\ce{CH4 + H2O}$ form? Thank ...
0
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1answer
35 views

How could you dissolve a coating of CaCO3(s) from a metal plate?

A metal plate has an unwanted coating of $\ce{CaCO3(s)}$. You must find a way to clean this metal plate without causing any scratches or abrasion. How might you dissolve the coating? I know I ...
2
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1answer
24 views

Which one of the compounds listed would we use in order to get the highest concentration of sulphate ion in a saturated solution?

Solutions are prepared by dissolving a sulphate salt in water. Which one of the compounds listed would we use in order to get the highest concentration of sulphate ion, SO42-, in a saturated ...
3
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2answers
198 views

Is it possible to have Volume(solution) < Volume(solvent) + Volume(solute)?

I recall seeing chemistry demonstrations where a significant amount of a solute is dissolved in a solvent and the solution volume barely changes. Questions regarding this: 1) How is this possible? ...
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2answers
42 views

Separating gold and silver from gold foil using hydrochloric acid and hydrogen peroxide

I used $\ce{HCl}$ and $\ce{H2O2}$ to recover gold foils by dissolving all other metals. My solution I assume contains a large amount of silver. How do I drop the silver out of the $\ce{HCl}$ and ...
0
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1answer
24 views

Equilibrium Constant of a Salt knowing the solubility

Calculate the equilibrium constant in $\ce\\M ^ 3$ of the heterogeneous system in aqueous solution: $\ce{CaF2 \leftrightarrows Ca^{2+} + 2F-}$ Knowing that the solubility of the salt is $15.9 ...
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2answers
27 views

How can an insoluble compound be a strong electrolyte

Here's a quote from Petrruci General Chemistry (pg. 160): Silver chloride, $\ce{AgCl}$ is an insoluble ionic compound. When $\ce{AgCl}$ dissolved in water, it is 100% dissociated into ...
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2answers
62 views

Why is water a poor solvent for organic molecules?

Few organic molecules dissolve in water but why is this the case?
0
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0answers
24 views

I need to identify a substance

It is flat, brittle, greyish/teal colored and is white in the inside (broke with scopula.) It has a low melting point (melts into a clear liquid with the dye concentrating on the bottom) but cools ...
1
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1answer
27 views

What other factors can make a compound dissolve into water?

I am doing some homework just right now, and I encountered this problem. I know that the polarity of the water molecules allows them to be a solvent for a variety of polar species or even species ...
3
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0answers
64 views

Why do some solid chemicals dissolve better in colder water?

I just discovered that some solid chemicals, such as $\ce{Na2SO4}$, dissolve better in cold water than hot water from here and would like to know if there is any particular reason as to why. Is it ...
1
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1answer
21 views

Why is a reaction more favorable if one of the products is not soluble/sparingly soluble?

I have heard people go so far as to say that the "driving force" of a reaction is the formation of the precipitate. Why is this so? Whilst the process is almost certainly exothermic (I think - please ...
3
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1answer
59 views

What governs the merging of globs of inmiscible liquid?

If I add a small amount of chloroform to a bunch of water, it falls to the bottom as a glob. If I shake the container vigorously (being carefully not to spill any of the dangerous substance!), the ...
0
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2answers
44 views

Polarity of amino acids

If I understand correctly, solubility of organic compounds depends mainly on the presence of polar groups plus putting in the factor of the number of carbon atoms in the molecule. So putting that in ...
2
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1answer
33 views

Which chemicals could be used to dissolve Polybutylene Terephthalate (PBT), but not dissolve brass?

This is for a recycling project, I am looking to recover brass pins from electronic connectors made of glass reinforced Polybutylene Terephthalate (PBT). The objective is to find a chemical which ...
0
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0answers
42 views

Is glycerol/glycerin soluble in ethanol?

As titled, I wish to know if glycerol/glycerin is soluble in ethanol (not soluble, slightly soluble, very soluble)
1
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1answer
37 views

Why can't saliva clean “stickiness”?

Why is it that when you consume something that is sugary-sticky (like candy, chocolate, fruit juice, etc.) and get it on your skin, when you try to clean it off with saliva (particularly, ...
7
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1answer
74 views

Caclulating the Solubility of Fluorite in River Water

I am attempting to work through problems in Chapter 4 of Brunlow's 1979 Geochemistry text. The question is "Calculate the solubility of fluorite in river water with the average composition given in ...
3
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2answers
680 views

What chemical substance is obtained by dissolving C60 in olive oil?

What chemical substance/component would be obtained of dissolving Carbon-60 in olive oil? Would buckminsterfullerene (bucky-ball) change its spherical fullerene structure (a soccer ball) into ...
0
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1answer
169 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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4answers
2k views

Why is sand that insoluble?

Why is sand that insoluble? Sand is a polar molecule but does not dissolve in water. Is it because of the big structure that sand makes?
0
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3answers
121 views

How do you explain pKa to non professional?

Let's say we have substance A which was mixed with substance B to improve shelf-life because pKa of the substance A is 7.9 and in mix the pH is 5.2. Does this mean that in the solution with pH near 8 ...
2
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3answers
1k views

How to dissolve candle wax (parafin)?

Wikipedia states, that waxes can be dissolved by non-polar organic solvents. But I failed to disolve candle wax in both acetone and ethanol, which are the only organic solvents I have at home. I have ...
4
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5answers
4k views

Why doesn't calcium carbonate dissolve in water even though it is an ionic compound?

I studied the solubility of compounds in water. I have found that calcium carbonate doesn't dissolve in water. The teacher stated that the ionic compounds dissolve in water except some carbonates. ...
2
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1answer
157 views

Does solubility matter when measuring density with displacement method?

I thought I understood this, but I'm having some doubts now. My question is quite simple: Can the volume of a solid (specifically a granular crystal or powder) be accurately determined using the ...
2
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3answers
165 views

What to do about a un-dissolved substance?

To exterminate a coackroach infestation, I bought solid boric acid (in powder form). Rather than awaiting the cockroaches' encounter with the boric acid, I thought about spraying boric acid onto ...
11
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2answers
565 views

When I dissolve sugar in my cup of tea/coffee, does it become a liquid or gas, or neither?

When I dissolve sugar in my cup of tea/coffee, does the sugar go from being a solid to being a liquid or a gas, or neither? Related: What keeps the sugar suspended in the tea?
1
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1answer
98 views

How can I presume what dissolves what?

Regarding solvents, the only thing I remember from school is my teacher saying: "The same dissolves the same." regarding the polar/non-polar solvents. From this I understand that water is polar ...
0
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0answers
40 views

What are the uses of a mixture of chloroform and N2 gas?

What are the uses of a mixture of chloroform and $\ce{N2}$ gas? Also, what are the uses of a mixture of camphor and $\ce{N2}$ gas?
2
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3answers
80 views

Why won't increasing the temperature increase the solubility of a gas in a liquid solvent?

If I raise the temperature of a solution of a gas in a liquid solvent, why won't the solubility increase? Increasing the pressure will increase the solubility, but increasing the pressure doesn't ...
0
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2answers
79 views

How to calculate the solubility product for PbS from galvanic potential?

Knowing that at 25°C the following galvanic cell: $$\ce{Pb~|~Pb(NO_3)_2~1M~||~PbS~saturated~|~Pb}$$ shows an $\mathrm{EMF} =0,413~\mathrm{V}$, find the $K_{sp}$ of $\ce{PbS}$. My Approach This ...
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0answers
36 views

Does CO2 dissolution in different salt concentrations affects the amount of carbonic acid formed?

We have a school experiment, where I must report on the following question: Does salinity affect the solubility of $\ce{CO2}$ in saltwater? So we selected four different concentrations of salt ...
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0answers
21 views

How to produce hot water-soluble soap balls? What is their chemical background? What about medical capsules?

There are water-soluble balls for soap baths. Then there are medical capsules that disappear in mouth. Is it possible do this kind of capsules and water-soluble containers at home? If not, what do I ...
2
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0answers
48 views

Why don't plus one oxidation state metals form stable complexes with hydroxide ion?

For example, why doesn't AgOH exist as a stable compound? I read that it rapidly decomposes to silver oxide and water. $\ce{2AgOH -> Ag2O + H2O}$ $~~~~~~~~~pK_{decomposition}= 2.875$ ...
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2answers
294 views

Ionic compounds dissolve in nonpolar compounds?

I think ionic compounds dissolve in just about any compound including nonpolar. My reasoning is this: Neutral electric charge attracts both positive and negative(This I know from doing things with ...
3
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1answer
31 views

What is the Solubility of Common Noble Gases in Concentrated Phosphoric Acid, 85% w/v?

By Henry's Law, the concentration of a dissolving gas in a liquid is proportional to the partial pressure of that gas in contact with the liquid , mathematically, $ p = k_H c$, where $p$ is the ...
1
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1answer
243 views

What is the reason for the different solubility of silver halides in ammonia?

According to my knowledge, I know that $\ce{AgCl}$ dissolves in dilute ammonia, $\ce{AgBr}$ dissolves in concentrated ammonia and $\ce{AgI}$ does not dissolve even with concentrated ammonia. What is ...
1
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1answer
35 views

Can one reduce solubility of NaCl by adding CO2 under pressure? Will the salt fall out of solution?

One can salt CO2 out of solution by adding salt to carbonated water. Can one do the reverse? If one adds more and more CO2 to the water under pressure, can you drive out the salt?
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3answers
2k views

If CO2 is nonpolar how come much more dissolves in water than O2?

Why is it that $\ce{CO2}$ is considerably more soluble in water than $\ce{O2}$ is? $\ce{CO2}$ is nonpolar but dissolves in water which like $\ce{CO2}$ being nonpolar, doesn't make any sense. Is it ...
2
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3answers
46 views

What does the hydrolysis of a salt tell us about its basic/acidic character?

I'm curious to know how basicity and acidity arises when a salt or covalent compound is dissolved in water.
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1answer
57 views

Calculating the molar mass of a solute from freezing point

A 4.305-g sample of a nonelectrolyte is dissolved in 105 g of water. The solution freezes at -1.23C. Calculate the molar mass of the solute. Kf for water = 1.86C/m. My steps: 1.23=1.86 * x/1.05 ...
3
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1answer
74 views

Which is more soluble in water and why: K₂HPO₄ or CaHPO₄?

If I dissolve $\ce{K_2HPO_4}$ and $\ce{CaHPO_4}$ in water (two different reactions), the latter shows better solubility. Is it because $\ce{Ca^{2+}}$ has ha higher valence of $2$ than $\ce{K^+}$, ...
1
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1answer
112 views

What is the difference between a bond, force, and interaction?

I am trying to explain why some solids are more soluble in water than others: So the energy released from the formation of bonds between the solid solute molecules and water molecules compensate the ...
2
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1answer
369 views

Is there a readily available liquid that's more dense than water and insoluble?

I am looking for any liquid that does not dissolve in water with higher density and does not react with water, one that is readily available.
7
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1answer
131 views

Removing prenylated phenolics from clothing, shoes, and upholstery

I live in Southern California and sometimes hike in areas that can be overgrown with a plant called purple poodle-dog bush. As I found out the first time I went crashing through a stand of the stuff, ...
1
vote
3answers
80 views

Finding the initial concentration

The solubility product of $\ce{AgBr}$ is $7.7 \cdot 10^{-13}\:\mathrm{mol^2/L^2}$. What was the initial concentration of $\ce{AgNO3}$ solution, if the precipitation of $\ce{AgBr}$ appears after the ...