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

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Calculate $K_{ps}$ from a galvanic cell

Knowing that at 25°C the following galvanic cell: $\\ Pb~|~Pb(NO_3)_2~1M~||~PbS~saturated~|~Pb$ shows an $emf =0,413~V$, find the $K_{ps}$ of $PbS$. My try: This is a concentration cell based on ...
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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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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 ...
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39 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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55 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 ...
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19 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 ...
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1answer
52 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 ...
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1answer
31 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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326 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 ...
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35 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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15 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 ...
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51 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 $\ce{K^+}$, ...
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1answer
47 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 ...
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1answer
75 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.
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94 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, ...
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3answers
73 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 ...
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1answer
98 views

Why does the solubility of Group II hydroxides increase and the solubility of sulphates decrease down the group?

I know that, solubility of alkaline earth metal hydroxides increases down the group and solubility of alkaline earth metal sulfates decreases down the group. Would you please explain me the reason ...
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Is it possible to turn coconut oil into a tablet pill

Is it possible to mix coconut oil with a blend of fillers and than apply to a pill press to formulate a coconut oil tablet. I am not interested in capsules.
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1answer
109 views

Solubility of p-nitrophenol in various substances?

So I had an organic chemistry lab where we had to dissolve p-nitrophenol in water, dilute $\ce{NaHCO3}$, dilute $\ce{NaOH}$, and dilute $\ce{HCl}$ to test for solubility. The p-nitrophenol dissolved ...
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1answer
67 views

How much carbonation is in one liter of commercial fountain coke-cola

From what I understand generally coke is carbonated to roughly 6.2g per liter in bottles and cans, or 3.1 volumes of CO2. I was watching this video because I was curious about how fountain soda ...
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1answer
45 views

Memorising exceptions for soluble salts

My daughter has a chemistry exam on Tuesday. She is doing quite well with her revision except for the following table which she is having difficulty remembering. Does anyone know of an easy way to ...
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1answer
109 views

Why are many silver salts insoluble?

For example, silver chloride, silver sulfide, and silver oxide are three exceedingly stable silver salts in water solution. Why is it that silver forms such stable salts? Does this have to do with ...
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25 views

Is there a good sol gel method for carbon nanotube thin film deposition?

I was searching for a sol gel method for deposition of carbon nanotube thin films and there aren't too many articles on that. Does anybody know the reason? Is it because Carbon nanotubes are ...
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1answer
66 views

CuI, CuSCN Solubility in Ammonia Solution

I am trying to dissolve copper(I) iodide and copper(I) thiocyanate in ammonia. I am quite sure that they both dissolve in liquid ammonia, and are insoluble in ethanol. If I were to purchase a 2.0M ...
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39 views

Permanent suspension of cocoa powder into water

I have failed in permanently suspending cocoa powder into water. I have tried heat (212'f) and pressure (40 psi) into a sugar water solution (50/50). Also, powdered milk and evaporated milk have ...
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Galvanic Element: Silver Iodide and Standard Hydrogen cell

I have to calculate the $\mathrm{p}\ce{H}$ of the $\ce{H+}$ solution with the following info: $\ce{Ag(s) | AgI(s) || H2(g)(1atm) | H+(aq) (X mol/L) | Pt(s)}$ $E=0.1\:\mathrm{V}$ Temperature ...
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1answer
103 views

Solvent for copper(I) iodide, copper(I) thiocyanate, silver iodide for HTM deposition; safety for methylammonium lead iodide

I'm a student working in a high school laboratory that is looking to pursue research into perovskite cells for next year, but I have some solubility and safety questions. What would be a good solvent ...
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26 views

A sample of tap water is found to be 0.025 M in Ca2+. If 105 mg of Na2SO4 is added to 100.0 mL of the tap water, will any CaSO4 precipitate?

Given: Ksp of CaSO4 is 7.10*10^-5 Molar mass of Na2SO4 is 142.04g/mol My Attempt: Step 1 - figure out molar solubility of CaSO4 √7.10*10^-5 = 8.43*10^-3M Step 2 - convert Na2SO4 from mass ...
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71 views

How to break down soap and detergents?

I am building a greywater harvesting system. I have all of it designed except one aspect. It is a 3 phase system. The first phase breaks down soap and detergents. The second phase filters the water. ...
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1answer
70 views

Help identifying a compound?

Trying to identify a mystery compound, here are some of my notes, I'm trying to get a second opinion on what it might be! Observations Appears as a white powder, some chunks are formed, sticking to ...
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1answer
43 views

Which of the following has highest solubility in water?

Which of the following has highest solubility in water? A. $ Ca(OH)_2 $ B. $ Fe(OH)_3 $ C. $ Cr(OH)_3 $ D. $ Zn(OH)_2 $ And also please explain how can we predict their solubilities when we are ...
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43 views

A question regarding solubility

The plot of solubility of some salts against temperature is given on the right. A salt like NaCl can be recovered fully, when dissolved in a solvent and the solvent is removed by evaporation. Choose ...
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2answers
228 views

The solubility of haloalkanes in water

Haloalkanes aren't very soluble in water because they can't form hydrogen bonds, and the energy required to break hydrogen bonds in water etc is higher than the energy released when new bonds between ...
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1answer
79 views

Why does sodium sulfate have an unusual solubility-temperature curve?

For many salts there are solubility curves as a function of temperature that are smooth (don't have any kinks). Sodium sulfate, however, has a kink in the solubility-T curve at 30 degrees as shown ...
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1answer
44 views

Thymolphthalein solubility

I already know that thymolphthalein is soluble in alcohols, very alkaline aqueous solutions, acetone, and propylene glycol methyl ether. My questions are what other solvents dissolve thymolphthalein, ...
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1answer
48 views

Searching for a solvate that changes its solvation property

I'm looking for a solvate that changes its solvation property when being dried. One example of such a material is gypsum: at temperatures up to 250°C it becomes γ-anhydrite which will slowly hydrate ...
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2answers
118 views

Heat when dissolving solutes in water

Why do certain solutes dissolved in water release heat and other solutes absorb heat?
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28 views

Does removing solution affect a supersaturated solution

Given a mixture of: a saturated solution of a solute in a solvent together with excess of the solute compound as crystalline material. If one were to change the bulk composition of the mixture by ...
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1answer
215 views

Using Activities and extended Debye-Huckel equation, find the ph of the solution 0.020 M NaCl

This is from a study guide for an exam coming up. So the Question is: Use activities to calculate the pH of each of the following solutions, being sure to use $\alpha$ values and the extended ...
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2answers
77 views

Best solvent for crystallization + mass recovered from crystallization + purity of the product

I have a chemistry final tomorrow and this question on my sample exam through me for a loop. I'm not entirely confident I can work out problems B and C, but those questions rely on the answer to A. ...
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2answers
81 views

Why Ionic compounds dissolve into water

First, I would like to say that I understand the basic idea of disassociation and solubility. However, as I study intermolecular forces I feel like this basic Idea is being challenged. My ...
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1answer
54 views

How much water has boiled off when precipitation begins?

Here's a challenge problem I created! None of my students could get it; can you? $25$ grams of table salt (NaCl) is dissolved in $150$ grams of water. The temperature of the solution is raised to its ...
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1answer
97 views

Conversion of units for concentration: mol/l to ppm

The concentration of an aqueous solution of $\ce{Mg(SO4)2}$ is $0.001\, \textrm{mol} \cdot \textrm{dm}^{-3}$. Find out the concentration of solution and the concentation of $\ce{Mg^{2+}}$ ion in ...
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1answer
75 views

Determining Fluorescence Quantum Yield of C60 in Toluene

For my experiment, I am trying to determine the fluorescence quantum yield of C60-fullerene in toluene (at room temperature). In order to do that, I need to have a standard sample with a valid and ...
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2answers
38 views

Calculating concentration of an ionic compound

$n$ liters of $k$ M $\ce{NaCl}$ are poured into $m$ liters of $l$ M $\ce{NaCl}$. Determine $\ce{[NaCl]}$, $\ce{[Na^+]}$, and $\ce{[Cl^{-}]}$.
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Two chemistry inquiries

Here is my second question, I know 1000 grams of water is 1 liter. But does the density affect the result? What if the substance is mercury? When you add seed crystal in to a supersaturated solution, ...
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4k views

What is the carbon dioxide content of a soda can or bottle?

I sort of know how carbonated beverages are carbonated: a lot of $\ce{CO2}$ gets pushed into the liquid, and the container is sealed. There are at least two things I don't know. First, how much carbon ...
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51 views

Solubility of Ag+ in NH3

$\ce{Ag+}$ can make a complex solution with $\ce{NH3}$ in this reaction: $$\begin{align}\ce {Ag+_{ (aq)} + 2NH3_{(aq)} <=> [Ag(NH3)2]+_{(aq)}} &\; K_\text{f} = 1.7×10^{-7}\end{align}$$ ...
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2answers
54 views

Insoluble Group I/ammonium salts

Most solubility references say that there are "few" insoluble salts of alkali metals (http://goo.gl/eq2Uf). Are there any exceptions?
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59 views

Does supersaturated caffeine polymerize?

I tried preparing a supersaturated solution of caffeine by mixing anhydrous caffeine powder with water in a thin Turkish tea glass and heating it up over a candle (desperate times...). This worked ...