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

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Heat when dissolving solutes in water

Why do certain solutes dissolved in water release heat and other solutes absorb heat?
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18 views

Does removing solution affect a supersaturated solution

Given a mixture of: a saturated solution of a solute in a solvent together with excess of the solute compound as crystalline material. If one were to change the bulk composition of the mixture by ...
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1answer
59 views

Using Activities and extended Debye-Huckel equation, find the ph of the solution 0.020 M NaCl

This is from a study guide for an exam coming up. So the Question is: Use activities to calculate the pH of each of the following solutions, being sure to use $\alpha$ values and the extended ...
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1answer
53 views

Best solvent for crystallization + mass recovered from crystallization + purity of the product

I have a chemistry final tomorrow and this question on my sample exam through me for a loop. I'm not entirely confident I can work out problems B and C, but those questions rely on the answer to A. ...
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1answer
48 views

Why Ionic compounds dissolve into water

First, I would like to say that I understand the basic idea of disassociation and solubility. However, as I study intermolecular forces I feel like this basic Idea is being challenged. My ...
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1answer
39 views

How much water has boiled off when precipitation begins?

Here's a challenge problem I created! None of my students could get it; can you? $25$ grams of table salt (NaCl) is dissolved in $150$ grams of water. The temperature of the solution is raised to its ...
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1answer
36 views

Conversion of units for concentration: mol/l to ppm

The concentration of an aqueous solution of $\ce{Mg(SO4)2}$ is $0.001\, \textrm{mol} \cdot \textrm{dm}^{-3}$. Find out the concentration of solution and the concentation of $\ce{Mg^{2+}}$ ion in ...
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1answer
50 views

Determining Fluorescence Quantum Yield of C60 in Toluene

For my experiment, I am trying to determine the fluorescence quantum yield of C60-fullerene in toluene (at room temperature). In order to do that, I need to have a standard sample with a valid and ...
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33 views

Calculating concentration of an ionic compound

$n$ liters of $k$ M $\ce{NaCl}$ are poured into $m$ liters of $l$ M $\ce{NaCl}$. Determine $\ce{[NaCl]}$, $\ce{[Na^+]}$, and $\ce{[Cl^{-}]}$.
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34 views

Two chemistry inquiries

Here is my second question, I know 1000 grams of water is 1 liter. But does the density affect the result? What if the substance is mercury? When you add seed crystal in to a supersaturated solution, ...
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3answers
455 views

What is the carbon dioxide content of a soda can or bottle?

I sort of know how carbonated beverages are carbonated: a lot of $\ce{CO2}$ gets pushed into the liquid, and the container is sealed. There are at least two things I don't know. First, how much carbon ...
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30 views

Solubility of Ag+ in NH3

$\ce{Ag+}$ can make a complex solution with $\ce{NH3}$ in this reaction: $$\begin{align}\ce {Ag+_{ (aq)} + 2NH3_{(aq)} <=> [Ag(NH3)2]+_{(aq)}} &\; K_\text{f} = 1.7×10^{-7}\end{align}$$ ...
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Insoluble Group I/ammonium salts

Most solubility references say that there are "few" insoluble salts of alkali metals (http://goo.gl/eq2Uf). Are there any exceptions?
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1answer
36 views

Does supersaturated caffeine polymerize?

I tried preparing a supersaturated solution of caffeine by mixing anhydrous caffeine powder with water in a thin Turkish tea glass and heating it up over a candle (desperate times...). This worked ...
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3answers
164 views

Why do solutions become saturated?

Why can a solvent dissolve only a particular amount of solute? If we add more solute to the solution, the number of solute particles in contact with water increases. So rate of dissolution should ...
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3answers
147 views

Substance whose solubility increases with decrease in temprature

Is there any chemical substance, whose solubility increases with decrease in temperature ?
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154 views

Can two precipitates form in a precipitation reaction that starts with only two compounds in water? [closed]

I was wondering if two solids can form from two aqueous solutions? Any examples?
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2answers
111 views

Solubility Question

Im trying to do my chem homework and I'm stumped. Determine the solubility of $\ce{N2}$ in water exposed to air at 25°C, if the atmospheric pressure is 1.2 atm, assume that the mole fraction of ...
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2answers
83 views

Is tea powder better dissolved when put in hot water?

I usually make tea by adding two spoons of tea powder to water at room temp. and start to heat it. My friend said it will be better to add the powder once the water starts boiling. She said that it ...
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1answer
100 views

why are Ca(OH)2 and Al(OH)3 less soluble than Na(OH) in water

Even though it has more $\ce{OH}$ groups and still it is very weak in terms of dissolving? please clarify to me in terms of polar and non polar solubility, how to determine whether a compound is ...
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1answer
64 views

Solutions, solvents and solutes

In all the chemistry books and eBooks it says that "like dissolves like"... but when it comes to some molecules like ether, cellulose, vitamin A and $\ce{CO_2}$, it confuses me. If we take ether, it ...
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1answer
71 views

How to liquefy or extract water from superabsorbent polymer

I am finding a good way to liquefy or extract water from superabsorbent polymer. From what I remember it was salt that can liquefy it. Since salt when dissolve will have sodium cation and there for ...
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1answer
50 views

Dyes that can stain oil and water

Is there such a thing as a dye that can stain both oil and water? In other words, does anyone know of an amphiphilic dye? Maybe a surfactant that is also a pretty shade of blue? Or maybe turn one ...
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1answer
78 views

Reducing temperature on dissolved Pb(NO3)2

I have pretty much zero experience in chemistry whatsoever but I wonder about how much crystal will I get from fully dissolved element when I reduce water temperature. Variables at 40°C 171g of ...
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1answer
37 views

Crystallization of sugars problem?

I produce high density balsamic vinegar, when it's winter and the temperatures are very low, High density products tends to crystallize . I think this is a problem of over saturation of the glucose / ...
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73 views

Best consumption-safe liquid for caffeine solubility?

The question is simple: What human-consumption safe liquid has the best caffeine solubility? It's 200mg/10mL of water. That's a lot of water for one dose! I found some ramblings on a fourm stating ...
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2answers
87 views

Imiscible fluids for demonstration

I have been considering building a fluid dynamics demonstration. Basically, it would be a thin plexiglass box, with some turbulence inducing elements attached to the back face, and a pump to move the ...
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1answer
56 views

Solubility in water and fats [closed]

Vitamin A is soluble in fat but not in water. This vitamin is found in foods such as yellow fruit and green vegetables. People who have little access to meat, frequently show signs of vitamin A ...
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4k views

How to calculate molality, molarity and mole fraction given density (g/mole)?

Calculate the molality, molarity and mole fraction of a $\ce{CuSO4}$ in a 17% m/m aqueous solution (density of the solution is 1.367 g/mole) I did .17 * 1.367 to find grams of $\ce{CuSO4}$ and .83 * ...
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1answer
1k views

How do I calculate the cell voltage using the following half-reactions and solubility products?

$$\ce{Cu_{(s)}|CuI_{(s)}|I^{–}_{(aq)}||Cl^{–}_{(aq)}| AgCl_{(s)}|Ag_{(s)}}$$ The concentrations of $\ce{NaCl}$ and $\ce{KI}$ are at $0.120 M$ and $0.090 M$, respectively, in the following ...
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1answer
63 views

Absolute limits on solubility of immiscible solutes?

I know that for a particular, immiscible solute, there is a limit on how much of it can be dissolved in a solvent at a given temperature. However, I was wondering if there is only so much "total ...
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2k views

Is H2CO3 (carbonic acid) soluble or insoluble in water?

I am asking this because I know that acids are normally aqueous but according to the solubility rules, all carbonates are insoluble.
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348 views

Which silver halide is the most soluble?

Halides are group 7 elements. They generally have a low melting and boiling point. They are highly reactive. Silver chloride and silver bromide are not soluble in water. So they will be precipitates. ...
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85 views

Thermodynamics behind Deliquescence?

The phenomenon of deliquescence wherein a water soluble substance absorbs water from atmosphere and dissolve in it forming a saturated solution, has thermodynamic roots. I have read the fact that the ...
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1k views

Why do salts dissolve? Why do $\ce{NaCl}$ crystals not stick together?

If we look at solubility of salts in water, we are told that they disassociate, because the positive $\ce{Na}$ ion is attracted to the partially negative oxygen in water and the negative $\ce{Cl}$ is ...
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1answer
122 views

Is Mn(C₂H₃O₂)₂ soluble in water? [closed]

Also, can you explain why, as in which solubility rules apply in this case?
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3answers
830 views

Making a saturated solution of $\ce{Na2CO3}$

I need to make a saturated solution of $\ce{Na2CO3}$ and according to the available data I should add $22\ \text{gm}$ in $100\ \text{ml}$ of water at $25^\circ\text{C}$. I wanted to make $300\ ...
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1answer
211 views

Ksp of Manganese Phosphate

I can't find the $K_{sp}$ value for Manganese Phosphate ($Mn_3(PO_4)_2$) anywhere online. Has it been measured? What is it?
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2answers
148 views

Can you carbonate a non aqueous liquid?

We have a home carbonator for makeing seltzer. It blows $\ce{CO2}$ under high pressure into water. Could I use it to carbonate corn oil? Is $\ce{CO2}$ soluble in a no aqueous solution?
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1answer
2k views

Boiling point and solubility

Which one of the following compounds has the highest solubility : $$\ce{CH3CH3 \ \ \ \ \ \ \ \ \ CH3-O-CH3 \ \ \ \ \ \ \ \ \ CH3CHO \ \ \ \ \ \ \ \ \ CH3OH}$$ Which one of the following compounds ...
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1answer
187 views

Solubility in non-aqueous solutions?

How do you determine which solids are more soluble in non-aqueous solutions? Here is the question that I struggle to understand the answer to: Which solid is much more soluble in 1 M HCl than in H2O? ...
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2answers
1k views

Increasing the solubility of Sodium Hydroxide

$\ce{NaOH -> Na^+ + OH^-}\ \ \ \ \Delta H ^o = -44.51 \ kJ/mol$ The dissolution of sodium hydroxide in water is an exothermic process, and so, according to Le Chatelier's principle, cooling the ...
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1answer
1k views

Solubility of Calcium Fluoride in water

$\ce{CaF2}$ is insoluble in water, but $\ce{CaCl2}$, $\ce{CaBr2}$, $\ce{CaI2}$ are soluble. Why is this so?
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1answer
239 views

Influence of solubility at different pHs on the complexation constants

Given some small chemical compounds whose solubility varies with pH, and in the case of compounds that can form complexes, I have seen that the complexation constant varies with pH. I think there ...
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1answer
96 views

How to determine which gas is more soluble

I have a chemistry homework problem that asks whether $Br_2$ or $O_2$ is more soluble in water in room temperature. However, I can't seem to find a way to figure it out, short of looking it up. Is ...
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0answers
267 views

Prediction of solubility (from chemical structure) at different pHs

I would like to know What is the best method for predicting the water solubility (and in other solvents) of a compound given its molecular structure at different pHs. What I know now is based on the ...
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1answer
49 views

Are pesticides used on fruit easily washed off?

I was hoping there'd be someone who studies pesticides here. Are they water soluble? Do they get absorbed in to the fruit? How well would you have to wash the fruit to fully remove the residue?
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77 views

Is it possible to estimate a substance's water solubility from data like the substance's partition coefficient, dissociation constants, etc.?

If it is possible, how would you estimate a compound's water solubility from data like its partition coefficient, $ \log P $, its dissociation constant, $pK_a $, its molar mass, etc.?
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Can magnesium chloride absorb water and ammonia at the same time?

Anhydrous magnesium chloride will absorb ammonia to the tune of ($\ce{Mg(NH3)6Cl2}$). Incidentally, magnesium chloride is usually a hexahydrate ($\ce{MgCl2(H2O)6}$) at STP. My question is, could ...
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191 views

Why is my NaCl solution seemingly saturated, when I followed the recipe for an isotonic solution?

I prepared an isotonic solution of table salt in water following this recipe: 1 leveled coffee spoon of salt in 0,5L of water. 9g/L would be an isotonic solution, a leveled coffee spoon is commonly ...