Questions tagged [mixtures]
Questions related to the physical combination of two or more substances on which the identities are retained and are mixed in the form of solutions, suspensions, and colloids.
154
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How to find the volume of the products in methane combustion?
The combustion of methane gas, $\ce{CH4}$, gives as products $\ce{CO2}$ and $\ce{H2O}$, both in the gas phase. If $1$ liter of methane is burned in the presence of $10$ liters of $\ce{O2}$. Suppose ...
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0answers
38 views
Why Does Adding Catalyst Slow Down My Reaction?
I currently did a lab where I was meant to identify factors that increase the rate of the reaction. I reacted Glucose with Potassium Permanganate and used Sulfuric Acid as a catalyst. But in my ...
0
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1answer
58 views
dissolving powder [closed]
I have small amount of rosemary herb powder mixed in a cup of water and it's only party dissolving. I was wondering if there is another powder that can be added to this water solution and dissolve the ...
0
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0answers
22 views
Combining two high-VP chemicals to get a low-VP mixture
I'd like to do a class experiment as a metaphor for human relationships. Two people each have a different chemical which evaporates quickly (at STP). There is one glass between them. If only one ...
0
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1answer
55 views
Why does adding salt to water help distillation?
I've been looking at instructions on how to get lanolin from fleece and a lot of the instructions mention that adding salt to the water before distillation will increase the lanolin yield. Why is this?...
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2answers
53 views
Ratio of Water to Isopropyl Alcohol? [closed]
I am looking for a very simple formula to calculate the ratio of water to 99% isopropyl alcohol that I need to prepare a solution with a density of 0.925 g/cm3. I am assuming there is one.
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0answers
19 views
Carbon Capture Absorption with Henry's Law
Assume the Henry’s coefficient for water at $\pu{20 °C}$ is $\pu{1.6E8 Pa}.$ What is the mole fraction of $\ce{CO2}$ that will be dissolved in water assuming that it is at equilibrium with a flue gas ...
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2answers
23k views
Why is water considered a pure substance instead of a mixture?
Why is water considered a pure substance instead of a mixture?
Wouldn't it, when the hydrogen atoms combine with the oxygen atom, be considered a mixture, because the atoms were combined to form a ...
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0answers
24 views
Gelifying hydrogen peroxide
What substances could be used to gelify 60% hydrogen peroxide? I imagine anything organic like agar would be broken down by the radicals. I tried looking up what dentists use and the only thing that ...
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0answers
27 views
Mixing ink with alcohol, MEG and water
First of all, I'm not a chemist and my knowledge in chemistry is not that extensive. However, I would like ask the following question: are there any chemical reasons that would explain that mixing a ...
2
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1answer
2k views
Will adding apple cider vinegar to freshly pressed fruit juice preserve it
Would adding apple cider vinegar to freshly cold pressed fruit juice be able to preserve the fruit juice and extend its shelf life? Would the juice change into vinegar with time?
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6answers
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Un-denaturing industrial alcohol
I have a question regarding the denaturation of industrial ethanol with methanol to discourage its consumption.
The boiling point of methanol is 64.7 °C, while the boiling point of ethanol is 78.37 °...
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1answer
92 views
How Would A Vast Mixture (Like an Ocean) of Ammonia-Water Behave in Terms of Evaporation and Freezing?
First, I'll go ahead and say I'm not very versed in chemistry. My question comes from my interest in planetary-sciences, specifically the speculation that there are likely exoplanets and moons with ...
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0answers
34 views
How do blue shifts in Raman spectra indicate a co-crystalline compound?
The short conference paper The Acetylene-Butane Co-Crystal: A Potentially Abundant Molecular Mineral on Titan (mentioned in EurekaAlert's 'Bathtub rings' around Titan's lakes might be made of alien ...
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1answer
43 views
Club soda manufacturing process and problem in quality
How to increase $\ce{CO2}$ gas in club soda? I am planning to start a PET bottled club soda industry. My process involves chilling the water up to about $\pu{4 °C}$ and filling under pressure up to $\...
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0answers
52 views
Over time what happens to soluble liquids with different densities
I have a case with two liquids: Water and another chemical which is miscible in water.
The chemical has a density of 800 g/l so it's 20% less dense than water.
Initially the chemical was mixed with ...
6
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0answers
506 views
Dry water using graphite
Dry water or "powdered water" is essentially a bunch of extremely small water droplets surrounded by $\ce{SiO2}$.
Some time ago, I was messing around and mixed some powdered graphite with water. (The ...
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0answers
38 views
What kind of chemical reaction happens when combining Tahini and Date syrup?
While both Tahini and Date syrup are quite thin, when mixed together they form a paste-like substance that is very delicious, and quite thick. But what kind of chemical reaction leads to such sudden ...
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2answers
15k views
How does dimethylsulfoxide serve as a cryoprotectant?
In cell culture, dimethylsulfoxide (DMSO) is added to prevent the formation of ice crystals which may lyse the cells. Exactly how does dimethylsulfoxide act as a cryoprotectant?
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2answers
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How do I calculate the total volume when i mix 1000 kg of glucose with 5000 L of water
I want to know how to calculate the resulting volume when I mix 1000 kg of glucose into 5000 L of water.
How does the calculation change if I'm mixing NaCl into the water, instead of glucose? Or ...
4
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3answers
270 views
Why does Coca-Cola Zero Sugar Contain Sodium Despite no Sodium Ingredients?
According to the Coca-Cola website and every label I read, Coca-Cola Zero Sugar is a mixture of organic compounds:
CARBONATED WATER (OC(OH)₂), CARAMEL COLOR (Various sugars), PHOSPHORIC ACID (H₃PO₄...
3
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1answer
4k views
Liquid to solid when exposed to air
Is there a liquid mixture that will become a solid when exposed to air/oxygen. Preferably a spongy material that is difficult to tear.
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3answers
3k views
Is it possible to boil a liquid by just mixing many immiscible liquids together?
In open air, when vapour pressure reaches 1 atm, boiling takes place.
I read that if we add two immiscible liquids together, the total vapour pressure of the 'mixture' is close to $p = p^*_A + p^*_b$,...
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0answers
70 views
Will evaporation from two immiscible liquids blow up a balloon?
Consider the following setup:
Two immiscible liquids A and B are placed inside a balloon at a temperature where neither one of them boils. The inside of the balloon contains some argon, and the ...
4
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1answer
414 views
Miscibility of Hexane and Ethanol (Anhydrous vs 96%)
In my lab, I mixed 8:2 (mass:mass) of Hexane:Ethanol
(Hexane: 0 ppm of water content, ...
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2answers
50 views
Average Molar Weight
We have a mixture of two gases, say nitrogen and hydrogen.
To calculate the average molar weight M , the formula says:
M (average) = (hydrogen pressure/100).M(H2) + ( 1 - nitrogen pressure/100).M(N2)...
19
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2answers
858 views
Can a stoichiometric mixture of oxygen and methane exist as a liquid at standard pressure and some (low) temperature?
This answer to the question Pre-mixing cryogenic fuels and using only one fuel tank written by a non-chemist (me) begins with:
At STP:
LOX's boiling point is 90.19 K
Methane's freezing ...
0
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1answer
49 views
Why do properties of colloidal solution depend only on dispersion medium's physical state? [closed]
According to a past year JEE question, properties of colloidal solution depends only on dispersion medium's physical state and not on nature of dispersed phase or dispersion medium, or temperature of ...
6
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2answers
2k views
How to determine the vapor pressure of a glycerine and propylene glycol mixture?
I am looking to calculate the minimum heat needed to create vapor from a specific mixture. I have a mixture of 60 % $\ce{C3H8O3}$ (glycerine) and 40 % $\ce{C3H8O2} $ (propylene glycol, propane-1,2-...
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1answer
10k views
How to calculate the vapour density of a mixture?
I have a gaseous mixture of $\ce{H2}$ and $\ce{CO2}$ which contains $66\%$ by mass of $\ce{CO2}$. I have to figure out the vapour density of the mixture (defined as mass of a certain volume of a ...
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0answers
92 views
Ethyl Acetate and other Solvents in a mixture: miscibility and stability
I was wondering about a heterogeneous solvent mixture containing multiple alcohols such as IPA, Ethanol, methanol etc. Would EtOAc (Ethyl Acetate) play nice in these mixtures at low volumes such as 1 ...
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1answer
63 views
Mass fraction in a mixture of metal salts given the total mass of the metal
I am trying to solve a question in my study and I don't get the answer required.
A mixture of $\ce{NaNO3}$ and $\ce{Na2SO4}$ weight $5.37$ grams, the $\ce{Na}$ = $1.61$ grams. What is the ...
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2answers
626 views
How to separate two liquids with both having the same properties?
I was curious if it was possible to separate such liquids e.g. two vegetable oils that happened to have different ingredients, so it is a different liquid, but the same density etc.
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2answers
2k views
What is the difference between a mixture and a solution? [closed]
Is there an actual difference, or are they synonymous?
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0answers
4k views
Isolation of codeine phosphate from Tylenol 2
So here is my question. This may be controversial for some, but I would like to tell you it is purely speculative and has no bearing on anything I would actually do.
If one has in their hands a ...
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0answers
54 views
Is the negative excess volume of ethanol/water the cause of my math error?
I have a binary mixture, say ethanol at $90\%wt$ ethanol, $10\%wt$ water. According to Perry's Chemical Engineers' Handbook 9th Ed., that mixture has a density of $0.81797g/cc$ (at $20^{\circ}C$). ...
6
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1answer
3k views
Chemical potential of mixtures
I feel that there are very few textbooks that treat the chemical potential of mixtures in an understandable clear way, which is why I wanted to ask here about certain things. Although I do not have a ...
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3answers
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How to Make Ferrofluid in a Bottle
I am trying to accomplish the very famous magnetic Ferrofluid in a bottle aka office desk toy.
Before anyone suggest to buy online, I would like to make it myself and learn the whole process VS store ...
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4answers
21k views
Best way to mix essential oils with water?
I am using alcohol as an emulsifier. Of course, I can use a lot of alcohol to mix the oil and water but I do not like the color and the % of alcohol in the mix. The best mix I made was 10ml water, 0....
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1answer
26 views
How do I identify how many reactions are occurring when precipitating a mixture?
An example of a question is:
After dissolving $x$ grams of a mixture of $\ce{Na2SO4}$ and $\ce{NaCl}$ in water, you add an excess of $\ce{BaCl2}$ solution. You filter off the precipitate which ...
0
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2answers
70 views
Wetting agent for H2O2 solution
I need to increase the wetting of an $\ce{H2O2}$ solution on ceramic surfaces. Does anyone know of a common chemical I can use for this?
The properties it would ideally have are:
Increases wetting ...
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1answer
581 views
What forms the emulsion in chocolate?
Some days ago, before buying a chocolate I read the ingredients and saw that it contains a natural emulsifier. A Google search didn't reveal anything about of what the emulsion formed is, do you have ...
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1answer
38 views
Mix quaternary ammonium compounds with washing powder [closed]
So to get rid of bad smells from clothes that have stayed wet for long, I am wondering if I can just add a disinfecting product to my wash in addition to regular washing powder.
I have a product ...
0
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0answers
375 views
Why are Colloids Heterogeneous?
I understand that the definition of a heterogeneous mixture is a mixture in which 2 or more phases are present, i.e. you can see the mixture is not uniform. I know a homogeneous mixture is a mixture ...
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1answer
147 views
Connection between Gibbs Energy of Formation and Gibbs Energy of Mixing
Recently I found the following formula, which I cannot verify to be correct. Since I found this formula in several publications I assume that it is correct but I don't know why.
First there is the ...
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1answer
2k views
Difference between Excess property and property changes of mixing
I have some confusion in my mind about the difference between an excess property and a property change of mixing. I know that the Excess property is defined as the difference between the actual value ...
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1answer
97 views
Is the stoichiometric coefficient equivalent to the mole fraction?
I have a small problem to understand (or distinguish between) two concepts of free mixing enthalpy.
In several textbooks, I found the following formula for the molar free mixing enthalpy (binary ...
17
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5answers
3k views
Is enthalpy additive in mixing?
When mixing two fluids of different composition at constant pressure when no heat can escape, is the enthalpy additive?
If not, how to compute the enthalpy of the mixture resulting from mixing two ...
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2answers
74 views
Is the %V/V composition defined for homogeneous mixtures? [duplicate]
Why do major websites such as NASA and Wikipedia discuss the composition of the earth's atmosphere in terms of percentage by volume instead of percentage by amount of substance? Isn't the percentage ...
4
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2answers
4k views
Strictly speaking, is air homogeneous?
Why would air be considered homogeneous in its gaseous state (by Wikipedia and several other sources) even though its concentration keeps varying with time?
A homogeneous fluid as i think of it is as ...
