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.
169
questions
7
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1answer
250 views
Is the density of a two-component mixture always between the densities of its individual components?
There exist eutectic mixtures, in which the freezing point of the mixture is below those of either component of the mixture, i.e., the freezing point of the mixture is not intermediate between that of ...
1
vote
1answer
51 views
Mass percent and mole percent of a composition
The Problem
A gas mixture contains hydrogen, carbon monoxide, and carbon dioxide. Calculate:
a) The mass% hydrogen if the mixture contains 15 mol% $\ce{CO}$ and no $\ce{CO2}$;
b) The molar composition ...
0
votes
1answer
45 views
How do I calculate the humidity inside sealed containers containing mixing salts?
At $\pu{25 ^\circ C}$:
saturated Magnesium chloride $\ce{MgCl2}$ keeps humidity 33% inside sealed containers.
saturated Sodium chloride $\ce{NaCl}$ keeps humidity 75% inside sealed containers.
I ...
0
votes
1answer
23 views
Hydrogen peroxide and ThickenUp (potassium chroride) [closed]
Retr0bright is used to whiten yellow plastic.
The original recipe contains xantham rubber that is a bit hard to find.
I'm thinking about using Nestlé ThickenUp that contains xantham rubber, but it ...
4
votes
2answers
414 views
What is the entropy of mixing a gas into the whole atmosphere?
Suppose I release 1 mole of pure argon into the atmosphere. What is the entropy of mixing? The equations I have found seem to only apply to the case of a fixed volume. Should I use an estimate of the ...
3
votes
2answers
230 views
Calculating the dissociation constant of one acid in a mixture
A solution contains $\pu{0.09 M}~\ce{HCl}, \pu{0.09 M}~\ce{CHCl2COOH}$ and $\pu{0.1 M}~\ce{CH3COOH}$. The $\mathrm{pH}$ of the solution is $1$. Given that the $K_\mathrm{a}$ of acetic acid is $10^{-5}$...
0
votes
0answers
13 views
Energy and impurities balance for adsorption with a fixed bed (with description)?
Do you have any suggestion where to look for a source of information about energy and impurities (component) balance for adsorption of mixture CO2/H2O in fixed bed?
I have looked into many articles /...
-1
votes
1answer
24 views
Difference between homogeneous and heterogeneous mixture [closed]
When i mix two equal but large number of stones it is possible (though extremely unlikely) that stone a and stone b perfectly segregate themselves into two halves or that they are uniformly ...
0
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0answers
22 views
Gas / Gas mixture dynamic viscosity temperature and pressure dependance
I’m trying to get an accurate interpretation of certain gases ($CO_2$, $N_2$, $NO$, etc.) dynamic viscosity [Pa.s] as a function of temperature and pressure (afterwards determine the dynamic viscosity ...
1
vote
1answer
95 views
Did I accidentally create phosgene gas [closed]
I accidentally mixed bleach and acetone trying to remove hair dye stains from my shower wall. The mixture turned orange when the bleach and acetone touched. Could I have created phosgene gas ...
4
votes
1answer
31 views
Combination of polydisperse polymer mixtures
Say I'm given a mixture of batches of polydisperse polymers. I know the weight $w$, the number average $ \bar M_n$, and the weight average $ \bar M_w$ of each batch that was added to the final mixture....
3
votes
3answers
438 views
What does my textbook mean by saying this about petroleum?
It reads:
Petroleum consists of crude oil and natural gas and contains a mixture of up to 300 hydrocarbons, including sulfur and nitrogen compounds. It is formed over thousands of years from the ...
4
votes
1answer
815 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, ...
5
votes
1answer
1k views
Strong exothermic mixing of two 'safe' liquids
I have read (thanks to Stack Exchange) that mixing water and sulfuric acid is exothermic, as is NaOH and HCl.
Are there two 'safe' liquids that can be mixed and produce anywhere near the same amount ...
14
votes
1answer
703 views
Mixing two containers of each water and ethanol to varying degrees of purity
In the following question, the water/wine mixing problem was recast in chemical terms. However, partial molar volumes can make this a much more challenging problem than it appears on the surface.
...
4
votes
2answers
2k views
How to calculate the partial pressure of oxygen in this mixture of oxygen and argon?
A $\pu{19.3 g}$ mixture of oxygen and argon is found to occupy a volume of $\pu{16.2 L}$ when measured at $\pu{675.9 mmHg}$ and $\pu{43.4 ^\circ{}C}$. What is the partial pressure of oxygen in this ...
2
votes
1answer
2k views
Most efficient way to purify household vinegar: distillation or freezing?
I am aware that there are better ways to purify acetic acid out of a water-acid mixture than these, but which one out of distillation (using heat) and fractional freezing (using cold) would gain a ...
0
votes
0answers
33 views
What is the result of the combustion of the mixture?
I prepared a little experiment about solid rocket propulsion. I have used water ($H_{2}O$), potassium nitrate ($KNO_{3}$) and saccharose ($C_{12}H_{22}O_{11}$).
I made the mixture in a pan by cooking ...
1
vote
0answers
41 views
Calculating concentration of a powder in a liquid
I'm trying to determine how to calculate proper measurements for a 5% concentration of a vitamin C ester powder (ascorbyl palmitate) mixed in a 50/50 carrier oil mixture (jojoba oil/squalane oil) with ...
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votes
2answers
27k 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 ...
0
votes
1answer
38 views
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 ...
0
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0answers
44 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
votes
1answer
230 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
votes
0answers
28 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
votes
1answer
67 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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votes
2answers
165 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.
1
vote
0answers
28 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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vote
0answers
28 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 ...
1
vote
0answers
37 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
votes
1answer
3k 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?
18
votes
6answers
7k views
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 °...
6
votes
1answer
116 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
40 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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votes
1answer
61 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 $\...
1
vote
0answers
91 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 ...
7
votes
0answers
529 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 ...
2
votes
0answers
51 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 ...
10
votes
2answers
16k 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?
0
votes
2answers
84 views
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
votes
3answers
559 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
votes
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.
14
votes
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 $p = p^*_A + p^*_b$,...
0
votes
0answers
84 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 ...
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votes
2answers
86 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)...
20
votes
2answers
959 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 point is 90....
0
votes
1answer
63 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
votes
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-...
2
votes
1answer
11k 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 ...
0
votes
0answers
102 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 ...
1
vote
1answer
70 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 ...
