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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Stoichiometry based on addition of simultaneous equilibria
I read on another equilibrium question that if two equilibria occur at the same time, then it is not accurate with actual stoichiometry to add the two equations and multiply the equilibrium constants $...
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1answer
176 views
Mixture of water, methanol and dichloromethane
If I have a mixture of 25 vol% methanol in water and I mix it with an equal volume of dichloromethane (which is miscible with methanol but not water) can I roughly say that both phases (i.e. water and ...
2
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1answer
83 views
Solubility of lead phosphate
I've read that lead phosphate is very slightly soluble and so any addition of protons shifts the equilibrium back to the solvated ions. What I can't understand is why the lead phosphate is more ...
6
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1answer
109 views
Does aluminium dissolve in soda glass?
Specifically, if a piece of aluminized glass is heated to the melting point of the glass will the coating dissolve into it or otherwise react with it?
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51 views
For azeotropic mixtures, is the total vapour pressure at equilibrium equal to the partial pressure of one of the components?
I know, a ridiculous statement. But here's how I reached at it .
Say we have a solution of two components liquids A and B.
By Raoults law,
$$p_A= p_A^o \times x_A \tag1$$
Also by Dalton's law,
$$...
2
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1answer
543 views
How to dissolve beeswax on the underside of a porous wood structure
Honeybees, like most insects, communicate through smell. They are attracted to the smell of beeswax. My profession is to rescue and relocate honeybees that have taken up residence inside walls, attics ...
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1answer
67 views
What is the percent of potassium as K₂O in the fertilizer sample?
The solubility of sodium tetraphenylborate in water is $\pu{470 g/L}$ while the solubility of potassium tetraphenylborate in water is $\pu{1.8e–4 g/L}$. Due to the orders of magnitude difference in ...
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2answers
510 views
What is the best way to calculate the mass percentage of Calcium Carbonate from water?
Where I live it's believed that local tap water is really bad for drinking because of the amount of limestone. As a science experiment for school I wanted to approximately calculate the percentage of ...
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1answer
154 views
Can buffer solutions be used to control the pH of ethanol?
For my experiment, I want to investigate the effect of differing pH on the solubilities of a sparingly soluble drug. However, the solubility is too low for me to conduct a reliable study on the ...
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1answer
84 views
Why does water expands when we add salt to it? [closed]
When we add salt to water the volume of the water expands. Why is that
0
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2answers
831 views
Does propylene glycol dissolve plastic?
According to Médecins Sans Frontières propylene glycol can dissolve plastic:
As propylene glycol can dissolve plastic... (Source).
Is this claim true? This seems rather spurious to me. If it ...
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1answer
142 views
Why does a weak base, which is also a salt, dissociate completely in water? [closed]
I'm answering a problem where $\ce{KOH}$ and $\ce{KOAc}$ dissociate nearly as much as each other in separate aqueous solutions at equal concentrations. The problem essentially assumed both completely ...
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1answer
33 views
How can I reduce sodium chloride levels in water, without removing other minerals?
How can I reduce sodium chloride levels in water, without removing other minerals?
Good day,
I make a sole from Himalayan Salt which I add to my Reverse Osmosis treated water to ensure my body isn't ...
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1answer
36 views
Should I include ions from the solvent in solubility product constant calculations?
I'm trying to determine the Solubility Constant $K_\mathrm{sp}$ of $\ce{Ba(NO3)2}$ dissolved in nitric acid solution $\ce{HNO3}$ from experimental data.
$\ce{HNO3}$ will be mostly dissociated so ...
6
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1answer
2k views
Can I boil off chlorine? Does it evaporate quickly at high temperatures?
Can I boil off chlorine?
Does it evaporate quickly at high temperatures?
I am asking because I want to remove it from drinking water, and I don't want to wait 24 hours for it to evaporate naturally.
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1answer
345 views
How dependent is the molal depression constant on the nature of solute?
I've been reading about the molal depression constant (freezing point depression constant) for binary solutions in class.
I encountered a problem (see below) in which the constant $K_f$ was to be ...
0
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1answer
198 views
Is NaCl the only precipitate when you add HCl to concentrated NaCl [closed]
When aqueous HCl is added to a saturated salt water solution, is NaCl the only precipitate or does some HCl crystalize as well?
Sources online say that NaCl crystallizes but they don't say what ...
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36 views
Effect of temperature on concentration of ammonia in trichloromethane
By reviewing some literature on the distribution of ammonia in water and trichloromethane, I've found that increasing temperature decreases the partition coefficient of ammonia given that the formula ...
2
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1answer
53 views
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
75k 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 ...
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1answer
1k 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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2answers
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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....
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1answer
78 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
414 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
188 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
22k 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?
3
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0answers
232 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
307 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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42 views
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 ...
3
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1answer
6k 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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votes
2answers
157 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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38 views
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
131 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
152 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 ...
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0answers
426 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
767 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
128 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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1answer
118 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 ...
4
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2answers
125 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
1k 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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0answers
46 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 ...
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1answer
238 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
2k 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
2k 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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1answer
26 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
101 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 ...
3
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1answer
805 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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4answers
1k 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
920 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. ...
