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.

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Heating a mixture of methanol and water?

I have a mixture methanol and water, at 25°C, and I want to take it to 250°C. I'll use two heat exchangers: one for taking the mixture from a liquid state (25°C) to a vapor state (X°C), and the second ...
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928 views

Will water allow salts to be dissolved in methanol (that are otherwise poorly soluble)?

If we make a mixture of water, methanol and a salt like $\ce{FeCl2}$, $\ce{NaCl}$ etc, will the ability of water and methanol to mix allow $\ce{FeCl2}$ and $\ce{NaCl}$ to be a part of this mixture and ...
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Is it possible for a compound to be soluble in a mixture of solvents but not the individual solvents?

Some weeks ago one of my friend needed to use turpentine. As a good but ignorant chemist on that point I did some research about it. I found (at the beginning) in the French wikipedia page of ...
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276 views

Mixing water and oil in microgravity outside of a container

What would happen if I where to mix water and oil in a vacuum in microgravity where the temperatures were low enough so that the oil and water remain liquids also, the mixture is not inside of a ...
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356 views

What is the pH of a solution that results of a mixture of two others with known pH?

Solution A has a pH of 1, soultion B has a pH of 6. If I mix the same volume V of each solution into one, what will be the pH of the resulting solution? I'm guessing here as no more information has ...
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3answers
724 views

How does a mixture not retain its chemical identity?

My book says that matter can be classified as an element, compound, or mixture. It further says that a pure substance (or substance) is matter that has distinct properties and a composition that doesn'...
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Chemical theory, formula(s) that predict final *volume* of a solution?

I asked this question a couple years back regarding the volume of a mixture being less than the volume of the original solute and solvent, but this question asks if there is theory and/or formulation ...
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1answer
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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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What happens if I increase the amount of water on water based epoxies?

I am using a water based epoxy coating that is composed of a resin and a hardener. There is a specific amount of proportion to use to obtain the optimum cured coating. But I am trying to introduce ...
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142 views

Is it possible for the remaining solute of a saturated solution to form a single even phase from top to bottom (similar to that of a colloid)?

If a solute that dissolves in a liquid solvent has reached high enough levels to cause saturation within the solution, is it possible for the remaining solute particles to form an evenly distributed ...
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54 views

Is there a way to find the mixture type with just the molecular formulas and masses of the solute and solvent?

If you had the molecular formula and molar mass of a solvent and a solute and no other specific information about the two, could one deduce the type of mixture (suspension, colloid, solution) they ...
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657 views

Titration to determine the amount of hydrogen peroxide

I have a mixture of sodium carbonate, sodium bicarbonate, ammonium carbonate, copper (II) sulfate, hydrogen peroxide, and sulfuric acid. I'm titrating potassium permanganate against this mixture to ...
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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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521 views

Why does mixing inks make subractive colors?

I have little knowledge of color theory and chemistery. Recently I came to know that printers use CMYK colored inks and combine them in different proportions to achieve any color on print. Let us ...
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1answer
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Boiling point elevation for a mixture of ethanol and water

Properties such as boiling point, freezing point and vapour pressure of a pure solvent change when solute molecules are added to get homogeneous solution. These are called colligative properties....
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How to deposit a durable layer of sensing molecules in a PVC matrix on the tip of an optical fiber?

Here is the situation that I have been tacking for weeks and I have still not understood. We are trying to understand how to do this: This mixture for the preparation of the "LI–PVC" was obtained ...
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118 views

Would combining essential oils and carrier oils be okay in terms of flash point?

With NO scientific, or chemical background, I am making my own beard oils. I found essential oil recipes online to mix with one or many carrier oils to make beard oil. I want to be original by going ...
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Jamming Theory or DLVO Theory for Oobleck

After doing some research I came across two theories that explain the shear thickening effect of Oobleck. The DLVO theory which involves the suspension of molecules via two opposing forces [...
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What is the difference between a mixture and a solution? [closed]

Is there an actual difference, or are they synonymous?
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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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738 views

Interpretation of miscibility curves

I stumbled across miscibility curves in the section Solubility of Liquids in Liquids (Organic Chemistry, by Wallwork and Grant) today. I'm not sure if my problem is with the way the content was laid ...
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Suppose a heated 5.00 g sample of sodium bicarbonate lost a mass of 1.00 g, what percent of impurity is in the sample?

The 5.00 g is a mixture of sodium bicarbonate and an unknown substance, making it impure. Balanced decomposition equation: $$\ce{2NaHCO3(s) -> NaCO3(s) + H2O(g) + CO2(g)}$$ There are 0.06 mol of ...
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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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Why does a distinction between homogenous and heterogenous mixtures exist?

Take a known homogeneous mixture like air (oxygen and nitrogen) for example. The two have different atomic masses, so the molecular weight is different. If I let the solution sit there for a long time,...
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Explain volume contraction in mixtures of alcohol and water

Could someone explain why volume contraction occurs when you mix an alcohol such as ethanol with water in relation hydrogen bonding and the dipole-dipole forces?
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Is there anything that doesn't mix with water OR oil?

It's well known that water and oil don't mix, and if you put them together, the oil will float on top of the water in a distinct layer. My understanding is that this is because water is polar due to ...
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Composition of carbon rods in alkaline batteries

The carbon rods in batteries look somewhat similar to graphite, but they do not leave a significant mark on paper. What form of carbon are they? Are they simply just graphite with a large amount of ...
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2answers
12k views

Are melting points for mixtures of solids ALWAYS below the melting points of the individual components?

In every chemistry lab we are taught that mixtures of compounds are going to have melting points lower than either of the components pure melting points. Is this always true? Or can there be ratios ...
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4answers
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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
606 views

It is possible to make an homogeneous solution of water and oil?

I wondered if in certain condition like very high pressure(so that water and oil remain liquids) and very high temperature(so that the variation of the Gibbs energy is negative--> ∆G = ∆H-T*∆S) we can ...
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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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If I mix 10 mg of salt in 1 liter of water… Will I drink exactly 0.01mg of salt per ml? [closed]

If I dissolve 10 mg of salt in 1 liter of water, will every milliliter of that water contain exactly 0.01 mg of salt? In other words, is a solution uniform in composition, or will there be areas ...
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Why can't salt water and fresh water mix?

Why can't fresh water and salt water mix? What happens when they collide with each other? What are their differences?
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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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2answers
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Separating Lipids from Milk

I am trying to develop a procedure to test the percent mass of lipids in (update: homogenized) milk. It doesn't need to be very accurate, just an interesting application of chemical principles. As I ...
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1answer
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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 ...
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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 ...
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2answers
735 views

Why did a former emulsion of oil and water precipitate after heating and cooling when heat made it originally?

I added 100 g coconut oil, 100 g distilled water and 500 mg lecithin to an 1800 watt blender. The motor from the blender has has a passive heating action. I blended it at full for four minutes. The ...
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Reaction of iron with steam

While studying about reversible reactions, my professor stated that the following reaction is a reversible reaction: $$\ce{Fe + H2O <=> Fe3O4 + H2}$$ She also stated that the product $\ce{...
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1answer
591 views

Volume changes when mixing DMSO and water

Since I know that a mixture of 500ml $\ce{H_2O}$ and 500ml ethanol gives less than a liter of mixture I wonder how strong this effect is when mixing DMSO and $\ce{H_2O}$. I'd assume it's nonzero - but ...
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Exothermic liquid-liquid mixing

Does anyone know of a good example of two liquids mixing very exothermically? As a reference, I'm thinking more like NaOH and water boiling when mixed at room temperature than ethanol and water are ...
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Is sand a mixture or a compound?

I was given an assignment to find out if sand is a mixture or a compound I'm sure it can't be an element. Considering the fact that a mixture contains two or more substances that are not chemically ...
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Why does the ink on my whiteboard move?

...or at least I thought so, when I saw that the ink that was on my whiteboard last night became really messed up the next day. The image below shows my whiteboard before (on the left) and after (on ...
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Does ethylene glycol sink in water?

I’m a little concerned that there is a far stronger mix of antifreeze in my car's coolant system than I am aware. I check the antifreeze level in my car (using a refractometer) when the engine is cold ...
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848 views

What is the molecular interpretation of Raoult's law?

I was reading about Raoult's law which states: It states that the partial vapour pressure of each component of an ideal mixture of liquids is equal to the vapour pressure of the pure component ...
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Meaning of “Diffusion Rate”

A friend is trying to understand a paper which discusses the diffusion of proteins through milk. Rather than listing a diffusivity (with units [Length]^2/[Time]), the paper lists the 'diffusion rate' ...
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What is the solvent and what is the solute?

This question is and I am learning about mixtures, solutions, solutes, solvents, and other terms related to these words. I know that a solute is the substance being mixed with or dissolved into the ...
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Is water a heterogeneous molecule? [closed]

My question is based upon the statement found here: an element may be homogeneous on a larger scale, compared to being heterogeneous on a smaller scale. This is known as an effective medium ...
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398 views

Does adsorption occur between liquids?

While reading a paper in a field other than chemistry, the author mentions a phenomena that he labelled "adsorption" and describes it as follows: ...I am told (though I do not know which liquids ...
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Can SLES get too old?

I've been using SLES to break surface tension in some water solutions. However after a year or so it seems like the ability to break surface tension seems to wear off in the solutions. So my question ...