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2answers
26 views

Cocrystals vs Eutectic mixtures

I was reading around about the different solid states of materials and I got to a point where I have reached the multi-component solids. I was not able to find a major difference between the cocrystal ...
2
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1answer
41 views

What is this equation for?

I have been given a formula on the topic of alloys and temperature, however am unsure specifically what this equation calculates. The equation is as follows: $xC_{1} + (1 - x) C_{2} = C_{3}$ I am ...
2
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1answer
72 views

What is the entropy of mixing of two ideal gases starting out with different pressures?

The entropy of mixing of ideal gas is given by this equation: $\Delta S_{mix} = -nR(x_1\ln x_1 + x_2\ln x_2)$ Does this equation works only when the initial conditions of both compartments are at ...
2
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1answer
277 views

Determining weight-percent methanol in water from specific gravity and temperature

The company I'm working with uses a fuel mixture of methanol and water. We use a hydrometer to measure specific gravity, in order to test the composition of fuel received from our suppliers. To ...
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3answers
772 views

Why 1-octanol is immiscible with water?

Octan-1-ol is polar due to the presence of the $\ce{-OH}$ group, but it is immiscible with water. How is it possible?
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2answers
60 views

Different techniques of distillations

I know that fractional distillation is used to separate two liquids that are miscible in one another and have close boiling points. However, I am really confused about vacuum and steam distillation - ...
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1answer
47 views

Change in pressure or volume of molten salt

I am doing a project in which I fill a cylinder with a volume of $636cm^2$ (made of stainless steel) with molten salt: 60% Sodium Nitrate ($NaNO_3$) and 40% Potassium Nitrate($KNO_3$). The container ...
6
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3answers
8k views

What is the carbon dioxide content of a soda can or bottle?

I sort of know how carbonated beverages are carbonated: a lot of $\ce{CO2}$ gets pushed into the liquid, and the container is sealed. There are at least two things I don't know. First, how much carbon ...
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2answers
246 views

Why does gold react with cyanide and sodium hydroxide

Why does gold react with cyanide and sodium hydroxide and what is the chemical reaction's impact on gold's atomic structure and bonding? What I think is since in the 'flotation' process, when the ...
2
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2answers
144 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, ...
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0answers
18 views

Soy Wax / Corn Syrup

I am trying to mix corn syrup with Soy Wax. Ratio is approximately 90% Soy Wax (in molten state) with 10% Corn Syrup but they are not miscible. Does anyone know of some type of "emulsifier" that could ...
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1answer
908 views

How to separate KCl from NaCl and MgCl2?

Having mixed powder of $\ce{KCl}$, $\ce{NaCl}$, and $\ce{MgCl2}$ (and, perhaps, some crap), how can the components be separated?
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1answer
104 views

Size of dispersed phase particles in colloid?

I am really confused about what the size of particles of dispersed phase in a colloid is: one of my textbook says its between $1 - 100nm$, another says its between $1-1000nm$, and Wikipedia says its ...
3
votes
2answers
149 views

Gold nanoparticles in a water/oil environment

I am currently investigating the assembly of gold nanoparticles in a mixture of water and oil. The thing is the following: If we have gold nanoparticles (35nm diameter) dispersed in water and we put ...
5
votes
2answers
433 views

How to determine a Reynolds number for mixture of 2 liquids

I'm experimenting with synthesis in microreactors and I'm using 2 reactants. I'd like to estimate the Reynolds number of the flow containing two miscible fluids. I have the values of their properties ...
3
votes
2answers
86 views

Is this relation in case of a mixture of ideal gases valid?

I came across the following relation in a book(written as a fact, with no proof), for a mixture of ideal gases both at the same pressure and temperature. The final volume of the mixture of gases ...
2
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2answers
272 views

What is the difference between a mixture and a composed substance?

In my textbook it says, that a composed substance is a substance made of more than 1 type of atom. And It also says, in another chapter it says that a mixture is the grouping of more than one ...
3
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1answer
118 views

Stir bar size and volume to stir

I'm looking for a table showing which size of bar to use for a given volume to stir. Or a formula if there is one.
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2answers
202 views

What household substances could be distilled

I'm looking to experiment with distillation to have a basis for understanding the theory slightly better, and get a better feel for it. I'm hoping for some suggestions as to what I could try ...
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2answers
1k views

Why water can't mix with oil or cooking oil?

Why water can't mix with oil or cooking oil (both saturated and unsaturated)?
12
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1answer
2k views

How does oobleck work?

Oobleck is basically a mixture of cornstarch and water. It has the interesting property of going hard when pressure is applied. For example, it feels like a liquid when you swirl your fingers through ...
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3answers
857 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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3answers
3k views

Why do any impurities lower the melting point of an isolated substance?

It is known that impurities in a desired isolated product lower the melting point of the mixture, even if the impurities melting point is much higher than the desired product. Why is that?