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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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How to take a sample of a hot salt solution without it precipitating in the cooler glassware due to the difference in solubilities at different temps?

I'm doing an investigation to see the effect of temperature on the solubility product of strontium hydroxide. I made a supersaturated solution left in the oven overnight at 85°C for equilibrium to be ...
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2answers
57k 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. I wish to understand the reason for these ...
7
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1answer
910 views

What substance has the lowest Kₛₚ value?

What substance has the lowest $K_\mathrm{sp}$ and what is its value? The lowest I could find is $2.6\cdot 10^{-124}$ for cobalt(III) sulfide $\ce{Co2S3}$.
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Is honey really a supersaturated solution? Does heating to un-crystalize redissolve it or melt it?

In the SciShow video Honey: Bacteria's Worst Enemy after about 00:30 the narrator says: Honey is only about 17% water. Most, but not all of what remains is sugar....
2
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1answer
32 views

Techniques to extract lipids

I am planning an experiment on how to isolate casein and part of the process involves removing any lipids that may still be in it after filtering the precipitated casein out of the milk. I have read ...
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1answer
69 views

Q. 36 2018 molar solubility of CaF2 at pH3 given molar solubility at pH7 and pKa of HF [closed]

This is Q36 on the 2018 Chemistry Olympiad: Calcium fluoride, $\ce{CaF2}$, has a molar solubility of $\pu{2.1e–4 mol L–1}$ at pH = 7.00. By what factor does its molar solubility increase in a ...
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1answer
65 views

Solubility of dimethyl ether in aliphatic hydrocarbons

I'm having trouble finding information on the solubility of dimethyl ether in a hydrocarbon like butane, propane, or isobutane. I've read that its soluble in methanol, ethanol, isoproanol, ...
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4answers
19k 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?
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0answers
174 views

The behaviour of Ag3PO4 in solution

To a $\pu{1L}$ flask, we add $\pu{4.1900 g}$ ($\pu{0.01001 mol}$) of $\ce{Ag3PO4}$, then fill it up with water. Knowing the following constants, we are asked to find the concentration of all species ...
2
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3answers
178 views

If all intermolecular forces are electrostatic in nature, why don’t large non polar molecule dissolve in water?

If I have a large non-polar substance A that forms strong dipole-induced dipole force (DIDF) with water, with strength comparable to that of H-bonds between water molecules, will A dissolve in water?
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Is the analyte included in the ionic strength equation?

I don't quite understand the calculation for ionic strength of a solution. The formula includes the concentration and charges of the ions in solution, however, is the analyte (whatever we're trying to ...
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What are the steps to making a soluble salt? Please help i have a test tomorrow that's 80% of my grade! [closed]

Complete the method of preparing dry crystals of the soluble salt cobalt (II) chloride-6-water from the insoluble base cobalt (II) carbonate. The method involves 4 steps. Step 1: Add an excess of ...
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1answer
4k views

Can dissolution reactions be endothermic?

Is it possible for a dissolution reaction of the form $$\ce{X(s) ->[solvent] X (solv)}$$ or $$\ce{M_mX_x (s) ->[solvent] m M^x+ (solv) + x X^m- (solv)}$$ to be endothermic, i.e. $\Delta_\...
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2answers
51 views

Determination of solubility equilibrium using galvanic cell reactions

This is the problem: We can determine the solubility equilibrium for silver bromide using cell: Ag (s) | AgNO3 (aq) || KBr (aq) | AgBr (s) | Ag (s) We know that: $\text{AgBr} + \text{e}^- \...
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how can I predict the rate of water ions precipitation on a surface?

Consider a titanium pot that contains 1kg water with the following ions: $[Ca^{2+}]=22000$ ppm, $[Mg^{2+}]=1500$ ppm,$[Sr^{2+}]=791$ ppm,$[Na^{1+}]=48000$ ppm,$[Cl^{1-}]=120000$ ppm,$[SO_4^{2-}]=...
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1answer
124 views

Solubility of a tribasic weak acid

I have a question that reads: $\ce{H3A}$ is a tribasic acid. The three deprotonations can be written as $\ce{H3A <=>[pKa1 = 2.9] H2A- <=>[pKa2 = 4.2] HA^{2-} <=>[pKa3 = 5.2] ...
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1answer
2k views

Is butanoic acid more soluble in water than ethyl acetate?

I was asked which of the two following isomeric compounds, a carboxylic acid and an ester, was more soluble in water. I believe both molecules should be somewhat soluble in water as they have polar C=...
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1answer
42 views

Is it possible to dissolve Raspberry ketone in warm water?

I poured a small amount of RK in cold water and it clumped together so I warmed it in the microwave and it disappeared in the water meaning it dissolved, but i was under the assumption that RK is ...
0
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0answers
26 views

why is methane gas solubility in water higher than carbon monoxide solubility in water?

The above graph depicts solubility in water at various temps. If we are dissolving in polar water, why is methane more soluble than a polar molecule like carbon monoxide?
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2answers
227 views

Calculating solubility of iron(III) hydroxide in water

The following example in Skoog's Analytical Chemistry uses mass-balance and charge-balance equations to calculate the solubility of iron(III) hydroxide in aqueous solution. $$ \begin{align} \ce{Fe(...
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3answers
56 views

Solubility of solids in liquids

How does crystallisation happen and why? I have been told that when a solid is dissolved in a liquid solvent, an equilibrium is set up between processes of dissolution and crystallisation. But if ...
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0answers
36 views

Why zinc sulphate solubility is higher in ethylene glycol than water?

I'm trying to find saturation point for dissolved zinc sulphate in water and ethylene glycol. Based on my knowledge, water is more polar than ethylene glycol as reflected in its higher dielectric ...
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1answer
43 views

In search of a safe and inexpensive solvent that can dissolve depolymerized polypropylene waste plastic

I work at a place where we depolymerize post consumer waste polypropylene waste plastic through a thermal catalytic conversion process. During process shutdown we have to clear up the vessels which ...
3
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2answers
51 views

Solubility of lead cyanide

I read that lead(II) iodide is soluble in excess KI solution due to complexation, but lead(II) cyanide does not dissolve in excess cyanide solution. This seems wrong since cyanide is a much better ...
3
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1answer
99 views

Solubility of Potassium Dichromate in Water

According to Wikipedia, the solubility of Potassium Dichromate increases very significantly with the temperature. At 20°C, 13g/100ml, and at 100°C, 104g/100ml. Therefore, it should be possible to ...
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1answer
33 views

Why does a lowered dielectric constant cause RNA/DNA precipitation in ethanol precipitation?

For ethanol precipitations, as mentioned in https://en.wikipedia.org/wiki/Ethanol_precipitation, given that the attraction of water molecules to charged ions like phosphates is based on Coulombic ...
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0answers
28 views

What causes the turbidity when preparing Fenton's reagent?

New guy, please be gentle. I might ask questions not according to conventions, I am not a chemist nor do I study chemistry. Feel free to adapt the question and the tagging. I am preparing a solution ...
9
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1answer
1k 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 ...
2
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1answer
168 views

How does lime prevent soda lime glass from dissolving in water?

How does lime addition as an ingredient prevent soda lime glass from dissolving in water? Does it form calcium silicate in the process of melting?
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2answers
159 views

Why is Mg(OH)2 sparingly soluble in water but soluble in NH4Cl

Is $\ce{Mg(OH)2}$ sparingly soluble in water because it's hydration enthalpy is not greater than its lattice enthalpy? Also, is it soluble in $\ce{NH4Cl}$ because it is a stronger base than $\ce{NH4(...
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1answer
1k views

Should moderately soluble compounds like calcium hydroxide be denoted (aq) or (s)?

I'm learning to write balanced molecular and ionic equations. For "moderately soluble" compounds such as calcium hydroxide, how do I know whether to write the state symbol as (aq) or (s)? This is the ...
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3answers
10k views

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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1answer
23 views

Can I have a homogeneous 2 molal solution of copper(II) sulfate at 20 °C?

I'm doing a high school chem project where I am making a calibration curve of copper(II) sulfate for spectrophotometry in which I make solutions with five different concentrations. The most ...
0
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1answer
42 views

Why are hydrogen-bonded compounds (such as NH3) excellent solvents for most lab reagents? [closed]

Hydrogen bonds are said to be one of the strongest molecular interactions in nature. Then why can most substances that interact through hydrogen bondig such as water and $\ce{NH3}$ able to dissolve a ...
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0answers
33 views

Solubility of copper(I) iodide in potassium iodide solution

Calculate the solubility of $\ce{CuI}$ in a $\pu{1.0e-4 M}$ $\ce{KI}$ solution, knowing that $K_\mathrm{sp}(\ce{CuI})=\pu{1.1e-12}$ and $K_\mathrm{s2}$ of the following reaction is $\pu{7.9e4}$. ...
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21 views

insoluble glue in acetone and alcohol

I am trying to make a tissue specimen for scanning electron microscopy. What I am looking for is a glue which isn't dissolved by both alcohol and acetone. Do you know of any?!
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1answer
95 views

why HI isn't fully miscible with cold water when HF is?

HF is more soluble in water than HI , due to greater hydrogen bonding in HF , accepted but, on the other hand HF is a very weak acid so it's dissociation will be meagre when compared to HI's ...
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What solvent can dissove both antimony chloride and titanium isopropoxide?

Am trying to create antimony doped titanium dioxide thin film. I plan on doing so with SILAR(successive ionic layer adsorption and reaction). My cationic precursor will be a solution of both antimony ...
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4answers
884 views

Ionic compound having highest solubility in water

Which ionic compound has highest solubility in water? I can find CsBr having highest solubility with 1230 g/L at 25 °C. Note: compounds like ethanol are soluble to any extent in water, but they are ...
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1answer
530 views

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. ...
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2answers
46 views

What explains the stark white colour of my iodometric titration analyte solution?

During my Advanced Higher (secondary school) investigation, I reacted pure copper with concentrated nitric acid to acquire a copper nitrate solution. This was neutralised with excess sodium carbonate ...
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1answer
47 views

Is there a Material that is High Heat Resistent and soluble?

What i‘m looking for is any sort of material that dissolves, while being able to resist temperatures of up to 1000°C. And it doesn‘t have to resist during dissolution, only while it‘s solid. And the ...
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2answers
14k views

How much carbonation is in one liter of commercial fountain Coca-Cola

From what I understand generally Coke is carbonated to roughly 6.2 g 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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2answers
20k views

Why does solubility of solids sometimes decrease with temperature increase?

Recently I was researching $\ce{Ca(OH)_2}$, and I found this on Wikipedia: \begin{array}{|c|l|}\hline {\rm \color{blue}{Solubility~in~water}} & {\mathrm{0.189\,g/100\,mL}\ (0\,^\circ\mathrm{...
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0answers
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Why gas solubility decreases with temperature? [duplicate]

I found this quote on a Chemistry LibreTexts website: If the heat given off in the dissolving process is greater than the heat required to break apart the solid, the net dissolving reaction is ...
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1answer
611 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
1k views

Calculating concentration of dissolved gas from its mole fraction

I came across the following (solved) problem in my textbook: The Henry's law constant for $\ce{O2}$ dissolved in water is $\pu{4.34 \times 10^4 atm}$ at $\pu{25 ^\circ C}$. If the partial pressure ...
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2answers
253 views

How to measure saturated salinity and mineral levels for flaked sea salt?

I am a sea salt enthusiast looking to make the perfect flakey sea salt. I start with sea water and boil it down to a thick brine. Then with less heat I reduce the brine more slowly and inverted salt ...
5
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3answers
549 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
52 views

What is the minimum mass of iron(III) chloride required to be added until the dark blue precipitate first appear?

How do I solve this question? The presence of iron(III) ion is confirmed in a qualitative analysis by adding potassium hexacyanoferrate(II) ($\ce{K4[Fe(CN)6]}$) solution. A dark blue ...