Questions tagged [evaporation]
The evaporation tag has no usage guidance.
44
questions
1
vote
0
answers
55
views
THF-H2O mixture at 80°C? isn't THF supposed to evaporate completely?
I was running a synthesis of TiO2 nanoparticles starting from a aqueous solution of TiCl4 2THF 0.125M at 80°C. Through a different experiment it was detemined that the maximum reaction yield was 96% ...
- 19
-2
votes
1
answer
244
views
Can a heated gas leave a container through downwards direction?
If I have a flask full of heated gas, with an opening at the BOTTOM of the flask and connected pipe facing downwards, can the heated gas can leave the flask through that opening?
And for an alternate ...
-2
votes
1
answer
167
views
If I spilled mercury in a carpeted room 28 years ago will it have evaporated by now? [closed]
I made a really stupid mistake as a kid 28 years ago and spilled about one teaspoon of mercury onto a carpeted floor of a room about 12x12 feet. I’m assuming it was organic mercury only because it was ...
5
votes
2
answers
615
views
Residue left after evaporation of a salt solution
When a salt solution is evaporated (bunsen burner, evaporating dish/beaker), for example CuSO4 aq, there will be residue left over, as with all salt solutions.
However, the common form of copper (II) ...
- 75
3
votes
0
answers
42
views
How might humidity inhibit the drying or hardening chemical oxidation process of linseed-based oil paint?
I understand that linseed-based oil paint essentially dries or hardens by the chemical process of oxidation and not by evaporation. If it is possible that humidity somehow inhibits the chemical drying ...
- 95
0
votes
0
answers
73
views
What equation can be used to determine the mass of water evaporation over time, when cooking?
When baking, cooking or writing recipes, it would be useful to have a ballpark estimate of evaporation rates. This question asks about water, although the answer would ideally include an ...
-3
votes
2
answers
98
views
Powder left everywhere after solution was left to evaporate. What could it be?
I dissolved a coin made of silver and copper and probably other metals in nitric acid. I neutralized the solution with some sodium hydroxide and then added salt(NaCl) to make Silver Chloride. A white ...
1
vote
0
answers
23
views
Advice on Evaporation / Leakage of Marquis and Ehrlich's reagents
I had ordered both Marquis and Ehrlich's reagents from a manufacturer and they came in eye dropper like bottles inside of prescription pill like bottles. The perscription pill bottles also had cotton ...
-1
votes
1
answer
334
views
Explaining Vapour Pressure and Evaporation by Chemical Potential
According to the coexistence curves, both gas and liquid phases can only exist when the chemical potential of both phases are equal.
Does this mean above and below the coexistence curve of liquid and ...
- 47
-4
votes
1
answer
73
views
What is the relationship between solutions and changes to states of matter?
For example, when liquid water evaporates, my instinct is to say that of course it's become gas, but I'm a bit unsure because, if I understand correctly, evaporation occurs because air dissolves the ...
-3
votes
1
answer
95
views
Understanding how evaporation works [closed]
I am struggling to grasp the concept of partial pressure and vapor pressure.
Consider a sealed container filled with water and a bit of air that is sufficiently dry placed in a room of temperature 25 ...
- 95
0
votes
2
answers
239
views
If everything tends to entropy, why does water spontaneously evaporate? [closed]
Knowing that the second law of thermodynamics states that everything tends to entropy, why does water and other volatile substances spontaneously evaporate, getting energy to do so from the surface ...
- 29
2
votes
0
answers
66
views
How does the Szilard-Einstein refrigerator design evaporate its refrigerant?
In their 1927 patent, Leo Szilard and Albert Einstein use butane as a refrigerant in their non-compressive refrigerator design. In the patent the authors begin the description of the principle of ...
- 121
1
vote
2
answers
132
views
"Cleaning" of HNO3 solution using distillation
In many industries, pickling baths are common. These are 10 cubic meter baths containing acid baths that metal components are dipped into prior to surface treatment. When the metals are dipped, some ...
0
votes
1
answer
49
views
Is the process of volume decrease in NaOH solutions reversible during evaporation of water from the solution? [closed]
While preparing w/w 50% NaOH solution I noticed a decrease in solution volume (5-10mL) in a 2L volumetric flask, so I am wondering if there is an increase in water volume during the water evaporation ...
-1
votes
2
answers
414
views
What is the difference between "smell/odor" and "vapor" of a substance? [closed]
A solid chemical substance with a very high vaporization temperature can still produce potent smells at room temperature. What, then, produces smell, and could smelling some potent solid substance ...
- 7
1
vote
1
answer
64
views
Slow evaporation versus vacuum evaporation
I have a salt in water and I want to evaporate the water. I'm wondering, what will be differences (if any) in the character of the crystals in a few scenarios:
Slow evaporation - let the solution sit ...
- 33
2
votes
0
answers
45
views
Improving accuracy of water lead test
Home water tests for lead have an accuracy of about 15 ppb. If I first do a gentle/slow boil for one hour (hot plate under a glass beaker of water) to reduce 2000 mL to 20 mL, will I then effectively ...
- 121
0
votes
0
answers
44
views
How is it possible that some celestial bodies have icy surfaces when water boils off at any temperature in absolute vacuum?
Why doesn't the ice on comets or on the moon Enceladus sublime? Enceladus doesn't have an atmosphere, so what is it that prevents Enceladus' water ice surface from becoming a gas? Did I miss something?...
1
vote
2
answers
1k
views
Evaporation Rate of Hydrochloric acid
I'm currently working in a Chemical Plant as an intern, and I was given a task to improve the efficiency of the blower, which is already in place right now, by designing a new blower for the ...
0
votes
0
answers
44
views
Searching for evidence-based published study that compares disinfectant residues after evaporation
I've been plowing through databases to find evidence-based research reporting on the residue remaining after evaporation of chemical disinfectants. I want to know if there is a study which states the ...
-2
votes
1
answer
60
views
Boiling and Evaporation [closed]
A closed tank is filled with water completely and heated from outside. What will occur boiling or evaporation or both?
- 1
1
vote
1
answer
67
views
Evaporation of zinc oxide
My question involves the evaporation of silicate material (e.g., rocks, minerals, geologic material), specifically I am trying to work the number of electrons (n) that are involved in the evaporation ...
- 31
-1
votes
1
answer
438
views
Is boiling aqueous solution of copper(II) sulfate safe?
I want to create saturated coper(II) sulfate solution in order to grow crystals. Is boiling a solution of copper sulfate at home safe? Are there any risks? Is the vapour pure water?
- 109
1
vote
0
answers
105
views
Saturation of air within isolated system with water and ethanol
I am planning an experiment in an isolated system that contains two droplets.
One droplet is water and the other one is a 40% ethanol-water mixture.
The isolated compartment is filled with air at 20°C....
2
votes
2
answers
396
views
Is it appropriate to say "solid-in-gas solution" and "liquid-in-gas solution"?
A number of books mention "solid-in-gas" and "liquid-in-gas" types of gaseous solutions.
However, for something to dissolve in a gas, it must be in its vapour phase. So, for ...
- 37
0
votes
1
answer
751
views
Boiling of ammonia water [closed]
L̶e̶t̶'̶s̶ ̶m̶a̶k̶e̶ ̶i̶t̶ ̶s̶i̶m̶p̶l̶e̶.̶ ̶I̶ ̶h̶a̶v̶e̶ ̶a̶ ̶p̶o̶o̶l̶ ̶o̶f̶ ̶a̶m̶m̶o̶n̶i̶a̶ ̶w̶a̶t̶e̶r̶,̶ ̶a̶n̶d̶ ̶w̶h̶e̶n̶ ̶I̶ ̶h̶e̶a̶t̶ ̶t̶h̶e̶ ̶a̶m̶m̶o̶n̶i̶a̶ ̶w̶a̶t̶e̶r̶,̶ ̶a̶m̶m̶o̶n̶i̶a̶ ...
- 19
3
votes
3
answers
943
views
Some salts lower the vapour pressure of water - do any raise it?
Plain old NaCl salt can slightly lower the vapour pressure of water for a given temperature. Other salts such as CaCl₂ lower the vapour pressure to a larger degree.
Do any salts, or compounds of any ...
- 131
1
vote
1
answer
351
views
In an open system, can water vapor escape into the atmosphere before reaching the boiling point? [duplicate]
In a closed system, water vapor would have nowhere to go and atmospheric pressure would not be a factor. It would reach dynamic equilibrium with only water vapor.
But in an open system, I think that ...
- 35
-1
votes
2
answers
1k
views
Why vapor pressure is unaffected by change in atmospheric pressure [duplicate]
I am a high school student and I am very confused in a topic about "vapor pressure of liquid". Why doesn't a change in atmospheric pressure affect vapor pressure? I think intuitively that ...
13
votes
2
answers
608
views
Do azeotropic mixtures evaporate proportionally?
Do azeotropes evaporate, without boiling, in proportionate amounts, or does this property describe their behaviour only at boiling point?
Concretely, if 91% isopropyl alcohol/water (by volume, i.e. an ...
- 241
3
votes
1
answer
458
views
Relative humidity and vapor-pressure in equilibrium
I have quite an unclear understanding of relative humidity. I am writing my understanding on the topic and please correct me wherever I'm wrong:
What I understood:
Let's say $\ce{H2O}$ has a (...
- 585
4
votes
3
answers
271
views
If all molecules have basically the same KE at a given temperature, why do lighter isotopes evaporate more readily?
One of the proxies used for paleoclimate is the ratio of oxygen-18 to oxygen-16 in ice cores and in sedimentary rocks. The idea is that water molecules with oxygen-18 generally evaporate less readily ...
- 1,249
0
votes
0
answers
132
views
Advice for a good solvent for fragrance
Hi any suggestions for a solvent for aroma oils, that has low evaporation and high diffusivity (low molecular weight and hence spreads well in the air). The solvent should also be soluble in water and ...
- 19
8
votes
5
answers
2k
views
Is the average kinetic energy of evaporating water molecules (at room temperature) equivalent to the average kinetic energy of boiling water?
Purpose:
On new year's eve, after a splendid red and an assortment of sumptuous repasts, I made a bold remark which, on further consideration, may turn out to be incorrect. Unless! Unless I can ...
- 83
1
vote
1
answer
279
views
Definition of enthalpy of vaporization
The amount of heat required to vapourize one mole of a liquid at
constant temperature and under standard pressure (1 bar) is called its
standard enthalpy of vapourization.
The enthalpy of vaporization ...
- 1,242
1
vote
1
answer
1k
views
Comparison of evaporation rate of liquids
Evaporation: Evaporation
is a type of vaporization that occurs on the surface of a liquid as it
changes into the gas phase. When a molecule near the surface absorbs
enough energy to overcome the ...
- 1,242
0
votes
1
answer
89
views
Dispersal of pyrethroid insecticide by vaporization - role of petroleum distillate in distribution in air
I live in Indonesia where there are many mosquitoes and products sold for their control.
One such product is this one:
The product contains 22ml of liquid, the contents of which likely vary slightly ...
- 101
0
votes
0
answers
25
views
Isolating additives in alcohol products
Given an alcohol-water solution (Liquor products) that may have additives and/or may have been aged in wood, I'd like to boil off the alcohol and the water to leave behind the various additives in a ...
- 109
-3
votes
1
answer
345
views
does NH4OH lose concentration when it is open? [closed]
I get a lot of variation on NH4OH titration and I am curious if anyone knows if NH4OH at concentration greater than 20% will evaporate the NH3 and decrease in concentration if it is open and at room ...
- 5
1
vote
2
answers
1k
views
How to make acetic acid more volatile so that it can be removed by vigorous aeration of an acetic acid-water mixture? [closed]
I want to remove acetic acid from a mixture of acetic acid and water by aeration. The concentration of acetic acid is 200 ppm (mg/L). The pH of the water is more than 5. I want to reduce the acetic ...
0
votes
3
answers
896
views
Why does Vapor Pressure decrease on addition of solute? [duplicate]
Consider a vessel with a volatile liquid in it. Let's say it has a vapor pressure $P^0$ when it is pure.
Now a non-volatile solute is added to it. Its vapor pressure decreases as $P^0\chi_{solvent}$.
...
- 159
8
votes
3
answers
948
views
Detailed kinetic explanation for vapor pressure reduction by dissolved solute?
The following problem was asked in JEE Mains 2020 (Sept 2, Shift 1),
An open beaker of water in equilibrium with water vapor is in a sealed container. When a few grams of glucose are added to the ...
- 3,033
0
votes
1
answer
492
views
Mass change during phase transition
When you fill up a balloon about a quarter way with liquefied butane fuel and let it sit at room temperature it will turn into gas. But why does the gas weigh the same as the liquified butane?
The ...
- 392