Questions tagged [solutions]

This tag should be applied to questions dealing with solutions of any kind. A solution is a liquid or solid phase containing more than one substance where, for convenience, one (or more) substance(s) called the solvent is treated differently from the other substances, which are called solutes. If water is the solvent, then the more appropriate 'aqueous-solution' tag should (also) be specified.

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1answer
864 views

Does the outcome of aromatic nitrations depend on the concentrations of nitric acid and sulfuric acid?

I came across a few equation and observed that when concentration of the $\ce{HNO3}$ and $\ce{H2SO4}$ with benzene ($\ce{C6H6}$) or its derivative varied the product changed. I did not perform any ...
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1answer
2k views

Why can we not use water instead of blank control solution in enzyme catalysis with Peroxidase experiment?

I have to do a lab about enzyme catalysis with Peroxidase in my Chemistry class. We are to use the blank control solution in the experiment. My question is, why can we not use water instead? I did ...
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1answer
3k views

Concentrations of mixed solutions

If I mix a $\pu{2 M}$ solution with a different $\pu{1 M}$ solution, do the individual solutions reduce in molarity to $\pu{1.33 M}$ and $\ce{0.33 M}$ respectively?
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3answers
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How is langmuir's adsorption isotherm different from Freundlich's

I see no difference between the two,both say that degree of adsorption reaches a limiting value at high pressures and at very low pressures degree of adsorption is directly propotional to pressure. ...
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1answer
313 views

Standard solution and extracted solution : same concentration?

Summary : I am currently testing how a certain type of foam adsorbs HAP, PCB and OCP, and to this end I am depositing some on the foam, then extracting it. To know how much was extracted, I need to ...
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4answers
6k 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
5k views

Does rate of Evaporation change with surface area?

Two vessels of the same volume, in the same location and open to the atmosphere. One is of a small diameter, the other is of a larger diameter. The question is will the vessel with the larger surface ...
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2answers
67k views

What is the differences between partial pressure and vapour pressure?

Was looking at Henry's law and Raoult's law constants and there seemto be lots of equations involved. Henry's law involves partial pressure and the latter involves the vapor pressure. Wondering what ...
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5answers
41k views

Difference between solubility and dissolution?

How is solubility different from dissolution? And how are they both different from solvation?
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1answer
4k 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
10k views

What is an equivalent?

I want to know what is an equivalent and how is it different from equivalent mass. How to calculate and why is it used in chemistry for knowing concentration?
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1answer
13k views

Why is M1*V1 = M2*V2 only used for diluting solutions?

Why is $M_1V_1 = M_2V_2$ only used for diluting solutions? Why can it not be used to figure out how many moles to add to make a solution more dilute?
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1answer
1k views

Converting sulfate ion to sulfur trioxide?

I have a solution of only sulfate ions (no other positive ions belonging to the sulfate ions, because the positive ions are attached to the intermediate in a catalytic reaction). I want to convert ...
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1answer
2k views

Mole fraction of solute of a dilute solution

According to our book, when the solution is dilute, the mole fraction of solute can be given as: X2 = molality (m) x mass of solvent (M1) / 1000 Actually it is written as: X2 = m/(1000/M1) How is ...
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1answer
246 views

How does shock trigger nucleation of gases dissolved in a liquid?

When you drop a bottle of soda, the dissolved $\ce{CO_2}$ starts nucleating. Opening it before it's 'settled' will trigger more nucleation and usually makes a mess. Why does the shock trigger ...
4
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1answer
12k views

Deviation from Raoult's law because of adhesive and cohesive forces

A solution made of two or more compounds have adhesive and cohesive forces. Cohesive forces are the attractive forces between the same molecules. Adhesive forces are the attractive forces between ...
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1answer
889 views

Oil :water partition coefficients

Is there a database or a website with a list of oil : water partition coefficients of substances ? I actually want the oil:water partition coefficients of : cholesterol, starch , methyl citrate , ...
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1answer
183 views

Solvated solids

I have a very basic question concerning solvation. If a solid (solute) was dissolved in a liquid (solvent), is the solute still in the solid state? or does it convert into another state of matter when ...
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1answer
1k views

Shelf-life of solutions

If I prepare the silver nitrate solution or any other solution, how can I know the shelf life of this solution? I know that it depends on the stability of the substance, but maybe there is some ...
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2answers
4k views

Does freezing a solution with water always cause the water to separate and form the ice lattice?

I'm curious, I was trying to look into the affect of freezing a solution with water even when the solution is completely miscible. I came across something that detailed this regarding salt water and ...
27
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3answers
25k views

Why do salts such as NaCl dissolve?

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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2answers
762 views

How can I calculate the energy of a solution by knowing all of it's elements?

How can I calculate the energy of a solution by knowing all of it's elements? For example: If I have 2 liters of salting water $\mathbf{NaCl_{(aq)}+H_2O_{(l)}}$ contains 1.5 g of salt, how can I ...
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9answers
447k views

Why does ice water get colder when salt is added?

It is well known that when you add salt to ice, the ice not only melts but will actually get colder. From chemistry books, I've learned that salt will lower the freezing point of water. But I’m a ...
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2answers
158 views

How to estimate HCN content in a volatile mixture?

How can you accurately qualitatively and quantitatively determine the HCN in a volatile product from water?
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0answers
160 views

How do xanthan gum and other hydrocolloids work?

Does anyone know what causes things like xanthan gum to make water into a slimy substance on the molecular level?
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2answers
5k views

Spontaneous explosion of a bottle containing alcohol and milk

A friend of mine gave me a bottle of home-made liquor which is a concoction of pure alcohol and sweetened milk. I accepted his gift happily and then I put the bottle in my cocktail cabinet. After an ...
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5answers
269 views

Is it possible for an acid and base to react to form an even stronger base or acid?

Is there a combination of an acid and a base that when mixed results in a solution that is more basic or more acidic than the initial base or acid, respectively? If so, do such combinations have a ...
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1answer
6k views

Why does permanent marker writing come off a white board when coated with white board marker?

Why is it that dry erase markers allow permanent markings to come off? Here's a demonstration.
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1answer
346 views

Why do some solutions eventually stop boiling and start “popping” as they get more concentrated?

A very long time ago I performed an experiment in my kitchen, part of which was to remove all water from a solution. Unfortunately I don't remember what was in it, but the point is that as the ...
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1answer
12k views

Physical state of hydronium

I am doing my chemistry homework and I am supposed to write the products when strong acids react with water, but I am unsure of the physical state for hydronium ions. Should it be liquid (l) or ...

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