Questions tagged [solubility]

For questions related to the solubility of compounds in various solvents, especially in water. Do not confuse with [solutions] or [aqueous-solution].

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94 views

Flaw in my logic on Henry's Law?

It states mathematically $ p=Kx $ where $x$ is mole fraction of dissolved gas and $p$ is partial pressure of the gas. Dissolution of gases is exothermic, so with increase in temperature, solubility $x$...
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293 views

Why do bicarbonates tend to be more soluble in water than carbonates, for Group 1 and Group 2 elements?

In Group 1 and Group 2, it is usually found that bicarbonates tend to be more soluble in water than carbonates. For example: $\ce{NaHCO3}$ has higher solubility than $\ce{Na2CO3}$ As most of the ...
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58 views

Can a molecular sieve be used increase the saturation of a fructose solution?

The Problem: Let's say we have an experiment where we are attempting to grow rock candy crystals by letting a solution of sugar crystalize on a wooden dowel. However, an error may have been made in ...
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105 views

Will ferric nitrate or nitric acid dissolve polylactic acid?

Will ferric nitrate dissolve 3D printed items? I wish to etch some sterling silver, for which we use either ferric nitrate or nitric acid, and wonder about 3d printing the design straight onto the ...
2
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1answer
395 views

Predicting Ka/Kb values using values for solubility in water

Given that $K_\mathrm{a}$ values are determined by the position of equilibrium for a species such as $\ce{HCl}$ where $K_\mathrm{a} = \ce{\frac{{[H^{+}]}{[Cl^{-}]}}{[HCl]}}$, I was wondering whether ...
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2k views

What is the difference between dissolution and absorption?

Let us first look at the definitions from Gold Book: Absorption: The process of one material (absorbate) being retained by another (absorbent); this may be the physical solution of a gas, liquid, ...
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1answer
87 views

How does a mostly non-polar molecule prevent a polar head from being pulled off by other polar molecules?

Linear-shaped molecules of a solute with a large non-polar section and a small polar head are not soluble in a polar solvent. Why is this? Why don't the attractive forces between a molecule of polar ...
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1answer
2k views

Why does adding water to a saturated solution increase the number of ions present in the solution?

In my book, it is stated that when some water is added to a test tube having a saturated $\ce{Ag2SO4}$ solution, with its solid at equilibrium, the number of $\ce{Ag}$ ions in the solution increases. ...
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54 views

Is is possible to Generate ~1ppm Copper in Solution from Elemental Copper? [closed]

I am designing a hydroponic system and need to control algae. Copper is a known algaecide and lettuce actually needs some copper to grow well. I had read stories about people using copper pennies in ...
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1answer
379 views

How does recrystallization work to purify if compounds have equal solubilities, but one is present in a greater quantity?

Every article or text I've read on crystallization states that it works by taking advantage primarily of differences in solubilities, but I've also been told that it can purify compounds with ...
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1answer
701 views

Solubility equilibrium [closed]

This is a worked example about solubility equilbrium I am new to this subject and I am really confused first of all I know that Q is the product of concentration of Ag and Cl in the solution and ksp ...
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Why is this scintillator component turning into a milky-white emulsion?

I am a chemistry and physics double major doing some chemistry work in a nuclear physics lab. My mentor is a physicist, so his area of expertise is occasionally mismatched with what I need for my ...
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1answer
1k views

Why are nitro compounds with at least one alpha-H soluble in NaOH?

Are all the nitro-compounds having at least one alpha-$\ce{H}$ soluble in $\ce{NaOH}$? And what does solubility has to do with alpha-$\ce{H}$? I was reading about tautomerism today and got stuck on ...
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1answer
877 views

Difference between Codeine Phosphate and Codeine Sulphate

I am concerned about Codeine medication. What are the differences between the two medications Codeine Phosphate and Codeine Sulphate and why are these two different types available as medication? Are ...
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1answer
45 views

How to evenly mix NaCl and Lactose

Q: You have 10 g NaCl (s) and 90 g Lactose (s) (both easily soluble in water.) You want to achieve a 100 g mixture of these two compounds in solid form where they are completely evenly mixed. (A 1 mg ...
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48 views

Transfer of odor molecules from oil to water

I brew beer, I'm not a chemist. I want to add natural peanut aroma to a beer. The most common way this is being done by brewers is the addition of peanut powder, which is essentially the product ...
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1answer
2k views

Sodium Carbonate saturation curve [closed]

Where can I find the saturation curve for Na2CO3 (Sodium Carbonate) versus temperature? Thanks, ECD40
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1answer
665 views

How to choose alcohol solvent for organic extraction?

Assuming I have an organic substance that is known to be "soluble in alcohol" (e.g. capsaicin) I want to extract, which alcohol should/can I use? I know that both ethanol and methanol are commonly ...
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2answers
1k views

What does pO2 of blood mean and why do we use it?

I understand the basic Dalton's law of partial pressures in gases. Also, Henry's law of diffusion, says, the concentration of gas dissolved in a fluid is proportional to the partial pressure above it. ...
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1answer
76 views

Will the solubility product constant differ in this case? [closed]

I am considering the solubility product of sodium citrate. I need this value, I do not have it. However, I do know that the solubility product of calcium citrate is (7±2)×10^−14. Is it safe to ...
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3answers
1k views

Calculating the density of a saturated salt solution

Is there a way to calculate the density of a saturated salt solution from the solubility limits or does it have to be experimentally determined? First instinct, is to add the mass of the salt to ...
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1answer
398 views

Why are copper salts less soluble than zinc salts?

Compounds with cations having pseudo-inert gas electron configurations have more covalent character than those that don't, therefore they should be less soluble. Here are some solubility products: $$...
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1answer
449 views

Potassium citrate in water

I take potassium as a supplement in the form of potassium citrate. I dissolve a small amount in tap water and I drink it. Usually, I need to stir a lot, and sometimes I warm the water a little to make ...
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How much calcium hydroxide will precipitate after addition of sodium hydroxide into saturated calcium hydroxide solution?

Below was question 34 in the USNCO 2017 exam: If $\pu{0.10 mol}$ of solid $\ce{NaOH}$ is added to $\pu{1.00 L}$ of a saturated solution of $\ce{Ca(OH)2}$ $(K_\mathrm{sp} = \pu{8.0 \times 10^-6})$, ...
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Polarity of Acetic Acid, Ethanol and 1-Propanol

In order to compare acetic acid, ethanol and 1-propanol in terms of solubility in hexane, I would like to order them in terms of (a)polarity. By looking up the dipole moments, I found that these ...
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216 views

Varying data about solubility of sodium acetate trihydrate

I recently looked up the solubility of sodium acetate trihydrate in water at 20°C and found surprisingly diverse values such as: 613g/l (GESTIS-Stoffdatenbank) 762g/l (TU Freiberg) 1250g/l (applichem, ...
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1answer
528 views

What is the logic behind the division into groups of anions and cations in qualitative inorganic analysis? [closed]

I find it very confusing and hard to memorize. Is there a way to deduce it, like understanding how it is derived, or is it just one of a lot of ways you can do it but is the standard one? Do people ...
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2answers
1k views

How to dissolve white dextrin in water?

Dextrin is labelled as highly soluble in water. I have white dextrin (analytical from Sigma Aldrich). When I mix it in water, no matter how long I stir and how little dextrin I put, I get a suspension....
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1answer
3k views

How to make pyramid-shaped NaCl salt crystals

I'm attempting to make sea salt pyramids like the one below. I understand this needs to be evaporated at a reasonable speed to stop the crystals forming a cube, as the when formed quickly, the edges ...
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1answer
1k views

Why is magnesium sulfate acidic? Why are my calculations showing that it is basic?

Let's say I was dissolving $\pu{1M}~\ce{MgSO_4}$ into water and I wanted to find the pH. I would go right to the reaction of the dissociation of $\ce{Mg(OH)_2}$: $$\ce{Mg(OH)_2 <=> Mg^2+ + 2OH-}...
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1answer
357 views

Finding equilibrium constant from solubility product constant

Given $$\ce{CuI(s) <=> Cu+(aq) + I-(aq)}\, ;\qquad K_\mathrm{sp} = 1.2 \cdot 10^{-12}$$ write a reasonable chemical reaction that describes the decomposition of $\ce{CuI2}$ in aqueous ...
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51 views

Can i calculate the solution of the problem in more simple way?

and i got a serious question. During my exercises at home, i found that im struggling a lot while solving simple problem`s like this one: I have an aquatic substance with 0.100 M of $\ce{Mg(NO3)2}$ ...
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972 views

Why is potassium bitartrate so insoluble?

The solubility of potassium bitartrate in water at 20°C is given by Wikipedia as 0.57 g per 100 ml, which is considerably lower than that of sodium bitartrate. Generally, a potassium salt is more ...
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386 views

Solubility of Calcium Oxalate in Aqueous Alcohol?

In searching through the literature for the solubility of calcium oxalate, I came across this post https://www.researchgate.net/post/Are_there_any_organic_inorganic_solvents_for_dissolving_Ca-oxalate ...
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2answers
97 views

Material that changes solubility when electric potential is applied [closed]

I am looking for a material witch is easy to deposit in thin films and which changes its solubility if a electric potential is applied. Do you know of any such materials ? EDIT: This is for what I ...
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1answer
127 views

A problem in solubility of salts with multistep hydrolysis of an ion possible

Calculate the solubility of $\ce{MnS}$ in pure water, $K_\mathrm{sp}(\ce{MnS}) = \pu{2.5e-10}$. Assume hydrolysis of $\ce{S^2-}$ ion. $K_1$ and $K_2$ for $\ce{H2S}$ are $10^{-7}$ and $10^{-14}$, ...
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1answer
125 views

Calculating weight of soluble salt in a solution

I got a solution which density is $\pu{1.035 g mL-1}$ and it contains soluble salt $\ce{Ba(NO3)2}$ at concentration of $\pu{0.250 M}$. The teacher is asking from me to "clear" the solution from the $\...
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1answer
509 views

Why would two isomers have different solubilities in water?

I was wondering as to why, e.g. $\ce{CH3CH2CH2CH2OH}$ and $\ce{(CH3)3COH}$, do not have the same solubility in water, considering they both have the same molecular formula.
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364 views

Aluminium sulphate solubility as function of the pH

earlier I asked about how to know the aluminium sulfate solubility as function of the ph (see the previous question here). I found this diagram on the page 57 of Rubin, A. J., & Hayden, P. L. (...
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1answer
297 views

How to know the aluminium sulfate solubility as function of the pH?

I'm trying to find a diagram or a reference for to know the solubility of aluminium sulfate $\mathrm{Al_{2}(SO_{4})_{3}}$ in differents pH values. Something like:
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1answer
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Order of Solubility [duplicate]

Why solubility of alkaline earth metals decreases down the group? In my book, it is given that solubility of earth metals increases down the group $$\ce{BeSO4 > MgSO4 > CaSO4 > SrSO3 > ...
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306 views

Multi-solvent recrystallization to extract solute from glycerol?

I have compound A contaminated with impurity B. Recrystallization in water would not yield pure compound A since impurity B is less soluble in it. The only solvent in which substances A and B have ...
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265 views

Beryllium iodide and solubility rules [closed]

The beryllium iodide $\ce{BeI2}$ as covalent compound is apolar, and thus, it should be water non-soluble. However, it is. Making a research on the web, I learned it is just in the middle of being ...
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2k views

Fajans' Rules Versus Lattice Enthalpy

In analyzing the solubility among $\ce{CaF2, CaCl2, CaBr2}$, I found that $\ce{CaF2}$ is insoluble due to high ionization enthalpy. But comparing among $\ce{AgF, AgCl, AgBr }$, it was said that $\...
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66 views

Formulation solubility?

Creatine is a popular sports/fitness supplement, generally sold as a powder to be mixed with water (usually like 5-10g creatine per serving). However, it is not very "soluble" in water -- barely 13.3g/...
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120 views

Solid with Boiling Point less than 100 °C [closed]

For an experiment I require a substance which is a solid at room temperature and boils at a temperature lower than 100 °C. Also, this solid should preferably be soluble in water. Are there any such ...
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1answer
58 views

Cheap antifreeze

We bought a house which has an outside boiler that is inoperable due to the tank freezing. I can repair but filling the boiler with 100 gallons of antifreeze is too expensive. Sodium chloride ...
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1answer
310 views

Treating a sample with water, how to deduce present compounds given precipitate and solution parameters?

A sample consists of one or more of the following salts: $\ce{Cu(CH3CO2)2}$ (acetate), $\ce{BaCl2}$, $\ce{(NH4)2SO4}$, $\ce{SrCO3}$, $\ce{KNO3}$. The sample, when treated with water, gives a white ...
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1answer
1k views

Explanation for solubility of group 2 halides [closed]

I understand that the solubility (in terms of moles/volume) of group 2 halides increase with increase in anion size, i.e. $$\ce{MF2 < MCl2 < MBr2 < MI2},$$ where $\ce{M = Mg, Ca, Sr, Ba},\...
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163 views

Effect on solubility by dissolution of other substance (no common ion)

In one of our recent classes on mass and momentum transfer, we studied qualitatively how blood drug concentrations vary after consuming a tablet containing that drug. We considered the following: ...