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

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Formalin fallen out of solution

Is there a way to bring back into solution a bottle of formalin that has crystallized? The bottle has been stored for several years at room temperature. Thanks in advance.
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13 views

Solubility rate vs temperature as a percentage [on hold]

I am doing an experiment on the solubility rate vs temperature. I have recorded the time it has taken for certain substances to dissolve. How do I work out the solubility rate as a percentage?
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2answers
45 views

The Salt Room, is there salt in the air?

I work in a restaurant where we dry age our uncut steaks in a cooler. Dry aging is a wonderfully complex process that improves the flavor of richly marbled steaks. Our particular type of aging cooler ...
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0answers
27 views

Alternative to water as solvent for lithium metaborate?

I want to prepare a sample of lithium metaborate ($\ce{LiBO2}$) and need to dissolve it for this purpose. The only solvents I found so far are water and ethanol. In ethanol, one cannot dissolve ...
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0answers
26 views

Is it possible to dissolve SnCl2 in water?

I have a solution of ammonia and water. I need to prepare a solution of $\ce{CuCl2}$ and $\ce{SnCl2}$ in ammonia and water. I can not dissolve $\ce{SnCl2}$ in water. Is it possible to dissolve it or ...
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3answers
1k views

How does oil on the surface of water prevent rust?

I distinctly remember a side-by-side comparison from a book where there are two nails submerged in water, in two beakers: one nail had a layer of oil on top of the water, and that nail didn't rust; ...
6
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1answer
64 views

How are solubilities of hydrate salts determined when competing equilibria are unavoidable?

When you calculate the solubility product constant for a salt and one of its hydrates, you sometimes get drastically different numbers! I don't know how this can be because they both dissociate into ...
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3answers
53 views

Can you push a liquid and a gas into a container at different pressures?

I have a gas ($\ce{CO2}$ for example) and I want to infuse it into a liquid ($\ce{H2O}$ for example). I need a higher pressure of $\ce{CO2}$ to do this. So I push in water into a sealed container (at ...
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1answer
26 views

Can ionic compounds can ever “dissolve” as molecular compounds do?

Here's an example. Say you take a 25˚C solution of NaCl, and lower the temperature suddenly. The equilibrium constant (solubility product) is immediately decreased, so ions start to join together into ...
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1answer
35 views

Identification of solutions by solubility when mixed with each other

$\ce{Pb^{2+} (aq), Cl- (aq), Ag+ (aq), (SO4)^{2-} (aq)}$. You number the four bottles, 1,2,3,4and while numbering them, you notice that bottles 1 and 3 have the word "cation" on their lids while ...
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1answer
129 views

Byproducts in Indigo Synthesis?

I have been messing around with making Indigo dye while waiting for bacteria to grow. I have been following the Baeyer-Drewson method. Basically, you mix nitrobenzaldehyde with an acetone water mix ...
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16 views

Absorbance of dpph test for antioxidant activity

What is the range absorbance for essential oil sample in dpph test (antioxidant activity)? My absorbance was 1.322. And the inhibition concentration was 21.121. My control absorbance was 1.676. Is ...
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1answer
50 views

Solubility when multiple salts are involved

Calculate the solubility of $\ce{AgCl}$ ($K_{sp} = 1.6\times10^{-10}$) in $100.0~\mathrm{mL}$ of $4.00\times10^{-3}~\mathrm{M}$ calcium chloride. The stated answer is: $2.0\times10^{-8}~\mathrm{M}$ ...
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0answers
44 views

What factors contribute most to solubility of ionic substances in highly polar solvents, esp. ionic liquids and DES?

I am trying to determine a method to dissolve a mineral salt with a lattice energy of ≈18000 kJ/mol. I know that lattice energy is the most significant factor affecting solubility of an ionic ...
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1answer
36 views

Is NaCl in water considered “solution” despite of NaCl's having some precipitation?

Is $\ce{NaCl}$ in water aqueous? For a certain amount of $\ce{NaCl}$, it can dissolve in water but if you add more $\ce{NaCl}$ it can't dissolve any more. So, if in a certain reaction $\ce{NaCl}$ is ...
2
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1answer
62 views

Why is lithium bromide used in absorption refrigerators?

Lithium bromide refrigerator Why is lithium bromide used in absorption refrigerators? It is more expensive than sodium chloride. The wikipedia article on lithium bromide says it is extremely ...
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1answer
39 views

Solubility in homogenous mixtures of solvents [duplicate]

Alcohol and water are miscible. I am coming across some chemicals that are soluble in alcohol and insoluble in water. If I know solubility in two solvents separately, is solubility in a mixture of ...
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0answers
30 views

Determining the solubility of a gas

Problems: Part 1: If 27 g of acetylene gas (C2H2) dissolves in 1.00 L of acetone at 1.0 atm, then what is the solubility of acetylene in acetone if the partial pressure of acetylene is increased to ...
2
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1answer
71 views

Solubility and Evaporation - Would the concentration still be 1 ppm?

A certain salt has a solubility of 1 mg/1 L. I have 1 mg of this certain salt dissolving in 1 L of water, I have a concentration of 1 ppm. 1st Question: If the solution is left open to evaporation, ...
14
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1answer
300 views

Are all NO3- salts soluble in water? If so, why?

All the examples of $\ce{NO3-}$ salts are soluble in water (all that I know about). Is it always so or there is some salt which doesn't dissolve in water? If so what is the reason behind it?
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49 views

How to find the standard enthalpy and entropy for the dissolution of silver chloride?

A maximum of $1.89~\mathrm{mg}$ of $\ce{AgCl}$ will dissolve in $1.00~\mathrm{L}$ of solution at $25.00~^\circ\mathrm{C}$. A maximum of $5.26~\mathrm{mg}$ of $\ce{AgCl}$ will dissolve in ...
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0answers
33 views

Alkali Metal Rosinates Solubility in Acetone

In violin finishing technology alkali metal Rosinates are used in varnish synthesis. Usually this alkali metal Rosinates are soluble in Turpentine. I also know that Copper, Zinc Rosinates are soluble ...
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2answers
92 views

How do I predict the solubility of a compound in a mixture of water and an organic co-solvent?

I'm trying to predict the solubility of long alcohols (e.g. 1-octanol, 1-decanol or 1-dodecanol) in a mixture of water and an organic co-solvent such as DMSO, acetonitrile or ethyl acetate. For ...
12
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1answer
78 views

Predicting relative solubilites of salts without Ksp values

Is there a way of comparing which salt is more soluble without knowing their $ K_{sp}$ data or performing experiments? For example, comparing $\ce{Hg2Cl2}$ and $\ce{Cr2(SO4)3}$. I am not sure ...
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1answer
34 views

Purification of water with ferric chloride

Ferric chloride ($\ce{FeCl3}$) is a chemical used in water treatment. If ferric chloride is added to a water sample containing calcium bicarbonate, would the $\mathrm{pH}$ of the solution decrease or ...
4
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1answer
51 views

Why are the three most simple alcohols completely miscible?

I want to know why the three most simple alcohols (methanol, ethanol and propanol) are completely miscible in water? I want to know what happens at molecular level. I think hydrogen bonding plays ...
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2answers
49 views

Identifying MgCl2 or CaCl2 in solution

I have an aqueous solution of either $\ce{MgCl2}$ or $\ce{CaCl2}$ in solution with $\ce{K2SO4}$. There is a white precipitate that forms on the bottom that does not dissolve when $\ce{HCl}$ is added ...
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81 views

Solubility of different compounds?

I am the typical student that is very bad in organic chemistry. I understand that some of you might find my question trivial and would instruct me to go google up my answers instead. I have tried ...
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1answer
54 views

Approximating the concentration of ions when a salt dissociates

In my textbook written that: Given that $K_\mathrm{sp}(\ce{Ag2CrO4})=9.0\times 10^{-12}$, consider the solubility of $\ce{Ag2CrO4}$ in a $0.100\:\mathrm{M}$ solution of $\ce{AgNO3}$. Initial ...
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0answers
46 views

Solubility of non polar substances in non polar solutions

From my understanding, the general rule for solubility is that polar molecules are soluble in polar liquids (e.g. water), and non polar substances are soluble in non polar liquids (organic solvents). ...
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3answers
418 views

Differentiation between Zn(2+), Al(3+), Mg(2+) in solution

If I have three aqueous ionic solutions in which I know that the cation is $\ce{Al^3+}$, $\ce{Mg^2+}$, or $\ce{Zn^2+}$, and that how do I find out which is which? I was thinking to add $\ce{OH-}$ in ...
2
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1answer
77 views

Is solubility in Qsp affected by coefficient?

Related to my previous question: Is solubility coefficient affected if ion data is given in Ksp? $200\,\mathrm{mL}$ solution of $0.02\,\mathrm{M}\,\ce{AgNO3}$ is added to $200\,\mathrm{mL}$ ...
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1answer
40 views

What is the Ksp of Al(OH)3?

Top hits on google are: This site Aluminum hydroxide $\ce{Al(OH)_3}$ >> $ 1.3×10^{–33}$ and This site Aluminum hydroxide $\ce{Al(OH)_3}$ >> $ 3×10^{–34}$ which is one order of magnitude ...
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0answers
29 views

Reference request for the number of solvents around a solute

I want to know if there is a way to find number of solvent molecules that are directly embracing a solute molecule ( something like a reference or table that shows waters of hydration ). Particularly ...
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2answers
213 views

How to calculate the pH of a saturated solution from its solubility constant Ksp and acidity constant Ka?

Given that $K_{\mathrm{sp}}(\ce{CaF2})=3.2\cdot 10^{-11}$, $K_{\mathrm{a}}(\ce{HF})=10^{-5}$, and $K_{\mathrm{w}}=10^{-14}$. Calculate $\mathrm{pH}$ of saturated $\ce{CaF2}$. Edit: Since my ...
3
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1answer
41 views

Is solubility coefficient affected if ion data is given in Ksp?

Recently I've been looking at this website, which says: The $K_{\mathrm{sp}}$ of $\ce{Cr(OH)3}$ is $6.70 \times 10^{-31}$ Problem 1: What is the minimum $\mathrm{pH}$ at which $\ce{Cr(OH)3}$ ...
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1answer
478 views

Why solubility decreases with temperature increase?

Recently I was researching $\ce{Ca(OH)_2}$, and I found this on Wikipedia: Can you explain why solubility decreases when temperature increases?
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Why cooling an exothermic solution it increases it's solubility? [duplicate]

In my chemistry book writes that cooling an exothermic solution(e.g. $\ce{NaOH + H2O}$) increases it's solubility, and I can't understand why since the cooling should decrease it.
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2answers
90 views

Solubility of C5H11OH and C5H11Cl

Objectively, what makes the solubility of $\ce{C5H11OH}$ greater than the $\ce{C5H11Cl}$ in water?
12
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1answer
110 views

Old, red sample of sodium tetraphenylborate—why it is red?

I have a really old sample of sodium tetraphenylborate. It should be white, but it is red. Does anyone know what was formed and how it influences precipitation of cations in water?
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Crystallization issue

For solid-liquid mixtures, cooling crystallization process can be used to separate the solute substances from each other. Assume that we have two salts that have very close solubility in a certain ...
2
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1answer
40 views

Henry's constant and solubility

According to Henry's law The solubility of gas in a liquid is directly proportional to the partial pressure i.e S=Kp My book says that higher the value of K at a given pressure lower is the ...
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2answers
95 views

How to determine which salt will precipitate from a solution containing multiple ions?

I have a solution containing $0.2\:\mathrm{mol}$ of $\ce{Br^-}$ ions and $\ce{SO_4^2-}$ ions each. Now if I add excess $\ce{AgNO3}$ in this solution, what will precipitate? $\ce{Ag2SO4}$ or ...
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1answer
41 views

Cohesive Energy Density table request

Quick question: Any one knows a resource for Cohesive Energy Density of some organic materials ? I am not looking for any specific molecule, actually I want to plan my project based on available ...
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1answer
63 views

Why do exothermic dissolution reactions occur?

I've always been taught that an exothermic dissolution means that the forming of solute-solvent bonds releases more energy than the energy consumed to break solute-solute bonds and solvent-solvent ...
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1answer
165 views

Mixing solvents, or how does paint thinner work?

I would like to understand how a mixture of solvents works together. For example, there are two solvents combined, and each one alone can dissolve some material, but one acts faster. How do they ...
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2answers
123 views

Double Replacement Reactions form Precipitates

Why do most all double replacement reactions result in a precipitate and an aqueous molecule? Is it because the individual solute molecules always form stronger bonds such as how in single replacement ...
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0answers
82 views

Concentration cell lower half cell concentration from measured cell potential

I am trying to find the Ksp of silver thiocyanate: AgSCN(s) --> Ag+ (aq)SCN-(aq) but I need to first prove that the lower [Ag+] = 1.27-12 M, but don't know how to find it. The data I am given: ...
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3answers
79 views

Effect of pressure on solubility of salts

The volume of certain saturated solution is greater than the sum of the volumes of the water and salt from which it is made. On increasing pressure solubility of this salt (a) Increases ...
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3answers
909 views

How concentrated can an acid be?

How concentrated can an acid be without it being supersaturated? Is there a certain limit to how concentrated an acid or base can be? When I mean concentration, I mean molarity; so how concentrated ...