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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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Difference between solubility and dissolution?

How is solubility different from dissolution? And how are they both different from solvation?
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1answer
3k 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
4k 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
10k 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
856 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 ...
8
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1answer
217 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
10k 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
832 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 , ...
4
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1answer
157 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 ...
14
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2answers
3k 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
21k 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
472 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 ...
35
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6answers
387k 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 ...
5
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2answers
152 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
158 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
4k 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 ...
4
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5answers
247 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
5k 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
321 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 ...
2
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1answer
10k 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 ...