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k0ka [10]
3 years ago
6

When doing a recrystallization what observations would prompt you to perform a hot filtration?

Chemistry
2 answers:
viva [34]3 years ago
7 0

Answer:

I would do a hot filtering if I observed that I was facing a situation where crystallization occurs in a hot solution, but decrystalization occurs in a cold solution.

Explanation:

The hot filtration method is generally employed in solids purification processes (solids mixing), also called recrystallization purification. In general, hot filtration is associated with the vacuum filtration method.

The hot filtration method uses the principle of different solubility at different temperatures, ie a substance is hot soluble in one solvent but not soluble in the same solvent at room temperature. In the hot solvent, only one substance in the mixture dissolves completely, the other substance remains insoluble and is retained by the filter. When the filtered solution cools, the insoluble substance is separated from the solvent.

In this case, it is only favorable to use hot filtration if you observe that crystallization of a particular material occurs in a hot solution and its dissolution occurs in cold solution.

KATRIN_1 [288]3 years ago
3 0
Answer is: <span>because dissolved compounds can crystallizing from solution during filtration and forming crystals on the filter paper or funnel.
</span>Recrystallization<span> is a technique used to purify chemicals by dissolving both impurities and a compound in an appropriate solvent, either compound or impurities can be removed from the solution, leaving the other behind.</span>
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<u>Answer:</u>

<em>The mineral we are talking about here is olivine.</em>

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It is a bit dark in color which ranges between yellow to Green to olive green. The luster present in it is nonmetallic luster but has a glassy finish and a substance hardness that is ranging between 6.5 to 7.

This mineral has granular masses which we can say has mass like sugar grains. This mineral has cleavage with conchoidal fracture present in it.

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seropon [69]

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Explanation:

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3 years ago
a student poured water in to a paper cup and let it freeze,when she came to take it out she saw the side pushed out
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Great Question!

Everything around us is made up of matter. (Matter is just a fancy word for stuff.) If you cut matter up as small as you possibly can - much smaller than you can see with your eyes, or even a microscope - then you get what scientists like to call atoms. There's lots of different kinds of atoms, like oxygen, nitrogen, and hydrogen atoms. You may have learned about some of these in school. When you put several atoms together, they "bond" (or stick) together and you get what's called molecules.

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O

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H H

Other molecules (for example, different types of chemicals) have different shapes.

When a liquid (like water) is frozen, all of the molecules start sticking to each other and holding on very tightly. Because different types of molecules have different shapes, they hold on to each other in different places. Most of the time, when they start holding on to each other, they get closer together. When the molecules get closer together, they take up less space, so the frozen solid ends up being smaller than the unfrozen liquid.

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If you were to put that water in a closed container in the freezer, then it would still get bigger. What happens to the container depends on what sort of a container it is. For example, if the container were made of thin plastic, it would probably stretch a bit as the water freezes. But if you were to put it in a very full, tightly sealed glass container, then the frozen water would be pushing so hard that the glass might break. This is why if you put a glass bottle of juice in the freezer, you're supposed to take the lid off until it's frozen all the way.

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