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

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How does lignin dissolve after hydrolysis with sulfuric acid?

The hydrolysis is performed on biomass and consists of pretreatment with 72% sulfuric acid at 30 degrees Celsius for 1 hour. Then water is added in order to dilute the acid concentration to 4%. Then ...
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What is the physics/chemistry behind gold dissolution in water/seawater?

Global ocean contains some amount of dissolved gold (around 0.05-0.005 ppb). Is it ions of gold? Is it just suspended atomic gold (like water vapor in gases - just suspended molecules)? Can pure ...
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Why does the solubility of some salts decrease with temperature?

It is well known to us that the Solubility of solute in a solution increases with the increase in the temperature because, when the temperature increases the molecules of the solvent gain more kinetic ...
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46 views

How soluble is uranium in molten iron?

As I know, uranium and iron simply aren't mixable, which means there are no U-Fe alloys. The Google says, uranium is insoluble in molten iron. But, if something is "insoluble", it actually means only ...
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1answer
57 views

How to extract caffeine from coffee

To extract caffeine from coffee, I tried reacting it with baking soda to make tannins more soluble. I then put in salt to push caffeine out of solution. I saturated it with salt and then mixed the ...
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32 views

Why are Alkali Metal Ions Soluble?

I think the question needs no elaboration. Why are salts containing Group 1A cations extremely soluble in water? I speculate that the reason involves the low charge density of those ions in a given ...
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1answer
27 views

Which isomers (cis or trans) are more water soluble?

As a general sense I know that cis isomers are less symmetrical and more polar in nature whereas trans isomers are less polar. Now given those information, would it be appropriate to assume that cis ...
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1answer
65 views

Vapor pressure of immiscible liquids

I have read that vapour pressure of a mixture of two immiscible liquids is $$P=P^0_A + P^0_B$$ where A and B are immiscible liquids. My question is, if they are immiscible, they would form separate ...
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23 views

How to calculate the new concentration of a solution after adding more solute and convert it to ppm?

My question is the following: $2~\mathrm{g}$ table salt is added to $0.5~\mathrm{m^3}$ water whose salt concentration is $10~\mathrm{mg\,L^{-1}}$. Compute the salt concentration of the mixture in ...
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1answer
51 views

After opening, when is a can of Diet Coke most acidic? (Based on a true story)

Situation: Clogged toilet, no plunger. Goal: Trying to use the acidity from a can of Diet Coke as toilet drain cleaner. Question: How can I maximize the acidity of a Diet Coke? Question 1: Should I ...
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23 views

Does the activity product decrease with increasing ionic strength?

I have a question regarding what happens to the solubility of $\ce{CaSO_4}$ or the rate that $\ce{CaSO_4}$ will dissolve when we add $\ce{NaCl}$ to the solution: $\ce{CaSO_4}$ will dissolve into ...
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Equilibrium constants and

I have a few questions about this two relations: We know that: $K_p$ = $e^{\frac{-\Delta G^0}{RT}}$ $(1)$ and $K_c = K_p (RT)^{\Delta n}$ $(2)$ Ok now I'm solving this problem about solubility: ...
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Calculate Solubility [closed]

So I've been looking at some chemistry processes and I was trying to conclude how they got the numbers they got. How would I go about calculating the solubility of Phenyl-2-nitropropene in Isopropyl ...
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1answer
38 views

How to calculate the amount of substance of nitrogen that dissolves in water?

The Henry's law constant for the solubility of $\ce{N2}$ gas in water at $298~\mathrm{K}$ is $10^5~\mathrm{atm}$. The mole fraction of $\ce{N2}$ in air is $0.8$. The amount of substance of ...
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The behaviour of Ag3PO4 in solution

To a 1L flask, we add $4.1900\mathrm{g}$ ($0.01001\ \mathrm{moles}$) of $\ce{Ag3PO4}$, then fill it up with water. Knowing the following constants, we are asked to find the concentration of all ...
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1answer
66 views

Why do alcohols and ethers have approximately the same solubility in water but different boiling points?

In Morrison & Boyd, I found this question: Butan-1-ol (b.p. $118~\mathrm{^\circ C}$) has a much higher boiling point than its isomer diethyl ether (b.p. $35~\mathrm{^\circ C}$), yet both ...
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A problem in ionic equilbrium

Question 1998(b) My attempt: I thought that $\ce{AgCl}$ would yield $\ce{Ag+}$ and $\ce{Cl-}$ ions, whose concentration can be found from $K_{sp}$ as $\sqrt{K_{sp}}$. This $\ce{Ag+}$ reacts with ...
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55 views

Understanding effect of ph on solubility of salt

In the following picture why Ksp is not simply S2- ? Why is f included with one species only? Please explain the last part. What does f represent and why it is used in molar solubility?
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43 views

How to filter out magnesium acetate (a soluble salt) quickly and cheaply from water

I am conducting an experiment that involves reacting a weak acid and a weak base to form water and a salt with this overall equation $$\ce{Mg(OH)2(s) + 2CH3COOH(l) <=> 2H2O(l) + ...
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28 views

Moderately soluable

In solubility rules, there is some exceptions. It says for example: All sulfate ($\ce{SO4^2-}$) compounds are soluble except those of $\ce{Ba^2+}$, $\ce{Sr^2+}$, $\ce{Ca^2+}$, $\ce{Pb^2+}$, ...
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Solubility of n-butanol and n-butanamine

I ran across something saying that n-butanamine is miscible in water while butanol is only partially soluble. Is this correct? Can anyone offer an explanation? I would have guessed that the decreased ...
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1answer
48 views

Freezing Point Depression Problem

Assuming an ideal solution, which of these 0.10 M solutions would have the least freezing point depression? $\ce{HCl}$ $\ce{NaBr}$ $\ce{KNO_3}$ $\ce{MgSO_4}$ They all produce ...
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32 views

What solutes will give the largest reduction in volume when dissolved in water

This question is inspired by another question. If you take some common salt (NaCl) and some water and mix them, then the volume of the solution is less than the volume of the constituents. I did ...
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Solubility of succinic acid in water vs ethyl acetate?

Today I completed an organic lab practical test about discontinuous extraction. I had to extract succinic acid from a water solution using ethyl acetate as the solvent extractor. After the ...
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50 views

Unique Solubility Expression for Sulfide Salts

While looking at aqeuous $\ce{K_{sp}}$ values in the back of my textbook, I noticed that there is a asterisk by all of the sulfide compounds (such as $\ce{HgS}$), and the asterisk says, "For a ...
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21 views

Mixing a Tagged Sample of Lead Iodide with another Iodide Salt [closed]

A sample of sparingly soluble $\ce{PbI_2{(s)}}$ containing radioactive $\ce{^{133}I}$ is added to 0.10 M $\ce{KI_{(aq)}}$ and stirred overnight, what happens? I The radioactivity of the liquid phase ...
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1answer
67 views

How to calculate saturation point of a solution?

Is there a way to calculate theoretical saturation point between 2 materials? For example, let's say I want to determine solubility of vitamin A in water, or vitamin B in olive oil, or vitamin D in ...
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Looking for solubility kinetics of zinc chloride hydroxide monohydrate

$\ce{Zn5(OH)8Cl2·H2O}$ is a crystalline solid insoluble in water. Often used as nutritional supplement. Preparation and chemistry of zinc chloride hydroxide monohydrate is known. I am looking for some ...
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Preventing precipitation of Ca(HPO4)2

Determine the $\ce{[H+]}$ needed to just prevent precipitation by $\ce{H2PO4^-}$ in a 0.25 M $\ce{H3PO4}$ solution that has $\ce{[Ca^{2+}]}$ = 0.15 M. The $K_{a1}$ of $\ce{H3PO4}$ is $7.1 \times ...
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2answers
63 views

Does exothermic solvation mean solute is more soluble at low temp?

(I'm surprised this question or a very similar one hasn't been asked, so I wouldn't be surprised if I just failed to find a question with my search that does answer this question.) I dissolved some ...
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Poor aqueous solubility of chloroazodin

Below is the structure of chloroazodin: Why is chloroazodin poorly soluble in water? It has multiple amine and imine nitrogens, all of which appear to be available for hydrogen bonding, and thus it ...
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Relative Solubilities of Salts in Acidic Solution [closed]

While studying for the Chemistry Olympiad, I stumbled across this problem which I don't understand the answer to: Which solid is much more soluble in 1 M $\ce{HCl}$ than in $\ce{H2O}$? (A) ...
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Solution , Solubility and Colligative Property? [closed]

Which of the following 0.1 M aqueous solution will have the lowest freezing point ? 1) Glucose 2) Urea 3) NaCl 4) K2SO4 How to relate Molarity with freezing point ? Should I use the relation ...
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Why does adding PBS to a lipid+propylene glycol solution cause the lipid to precipitate?

I am trying to create an aqueous phospholipid suspension using ~50 mg of 1,2-dibehenoyl-sn-glycero-3-phosphocholine (DBPC), 13 mL of propylene glycol (PG), and 72 mL of phosphate-buffered saline ...
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What is the chemical equation for this specific titration experiment and the solubility of the potassium nitrate solution?

In the experiment I performed a titration by adding 5cm3 0.25M KNO3 (saturated with AgBrO3), 10cm3 1M HCl and 10cm3 10% HI solution together and allowed to sit for 3 minutes. The chemical equation I ...
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Gas solubility in water and alcohol

I know that a certain gas is soluble in water but not in alcohol. How can I find the solubility of the gas in mixture of water and alcohol? Do I use a simple linear relation? The gas in question is ...
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Solubility of Alum

What is solubility product of $\ce{K2SO4. Al2(SO4)3.24H2O}$? Can we consider $K_{\rm sp}$ of salts $\ce{K2SO4}$ and $\ce{Al2(SO4)3}$ or something else to find solubility? I know that ...
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How to read solubility graph

The following table is showing the solubility of CO2 at different pressures. However, I cannot figure out how to read this graph. The y-axis is molar fraction so that should mean that its value = ...
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35 views

Formula of ionic compound for solubility equilibria

I have a question for writing formula of ionic compound for solubility equilibria. $$ \ce{CaSO_4 (s) <=> Ca^{2+} + SO^{2-}_4} $$ Where do $2+$ and $2-$ come from? $$\ce{Ag_2CrO_4 (s) ...
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solubility of silver benzoate

The ionisation constant of benzoic acid is $6.46*10^-5$ and Ksp of silver benzoate is $2.5*10^-13$. How many times is silver benzoate more soluble in a buffer solution of pH-3.19 as compared to water. ...
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Precipitation Reactions Question

Salts of $\ce{Fe^3+}$ and $\ce{Al^3+}$ are in a beaker of water. If NaOH is added slowly, what compound would precipitate first? For me, I think it's Fe^3+ because of its lower Ksp value when it ...
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Why do some insoluble salts undergo slow chemical reaction instead of dissociation in water?

$$\ce{PbCl2 + H2O ->[\Delta] Pb(OH)Cl + HCl}\tag{1}$$ $$\ce{2ZnCO3 + H2O ->[\Delta] Zn2(OH)2CO3 + CO2}\tag{2}$$ $$\ce{2NiS + 2H2O → Ni2(OH)2S + H2S}\tag{3}$$ $$\ce{Hg2SO4 + H2O → HgO + Hg + ...
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Why are amines more soluble than ethers in water?

For example, diethyl ether ($\ce{C2H5OC2H5}$) has a limited solubility of $6.05\rm~\frac{g}{100~mL}$ water at $25\rm~^\circ C$. However, diethylamine ($\ce{(C2H5)2NH}$) is a lot more soluble in water. ...
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How does increasing the molecular mass of compounds of homologous series affect solubility?

First of all, I know that increasing the molecular mass decreases the solubility of that compound wrt, of another compound of the homologous series in organic chemistry. My question is how? My text ...
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68 views

Solublity values interpretation

"Solubility: Soluble in water (>25 mg/ml), and DMSO (50 mM)." It happens to be talking about a drug but that's irrelevant to my question. Does this solubility statement reasonably indicate that I ...
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Potassium Alum Crystals

This is a question regarding the crystallization of KAl(SO4)2 * 12H2O. I have an idea of what to do (I'll explain later in the explanation), but I would like to hear other suggestions encase the ...
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Solubility Enthalpy of NaHCO3 [closed]

What is the solubility enthalpy of $\ce{NaHCO3}$ at 25 degree Celsius ($\mathrm{298K}$)?
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Why ethoxyethane is not very soluble in water? Since, oxygen in ethoxyethane is electronegative, as oxygen in water

If the reasons is related to polarity, I have another question. Why water is polar it is also symmetrical?
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31 views

Which substance(s) can solve gelatin (on film stock)?

I want to loosen the exposed layer on film stock which is made up of gelatin. Anything which would make gelatin dissolve that's not overly toxic? Thanks
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Non-Linear Solubility Trend

I am doing a lab on carbon dioxide solubility in water and I have a non-linear trend which seems to agree with the accepted trend. I am examining the change in solubility as a function of temperature. ...