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One of the easier and more reliable ways to check if a solid compound is pure after re-crystallization is to check its melting point. Impurities will always lower the melting point of a sample, and the more impure, the lower the melting point will be. By checking the melting point of your sample with a reference value from a book or reliable internet source, it can be determined exactly how impure the sample is.
If perhaps your compound is unknown, and thus are unable to obtain a reference value, you could obtain melting point of the sample, and then re-crystallize a few more times, obtaining a new melting point each time, until it is unchanged by re-crystallizing. This will of course decrease your yield, but if there is little fluctuation in your series of melting points, you can be sure you have a relatively pure sample.
What else can I help you with?
How do you say pure French?
pure-or-re
How do you say 'pure' in french?
purée is a french word!
What do you do with bubbling bath crystals?
they are a re crystels for bubblese bath
How would you say the English words pure light in French?
"lumière pure"
How would you separate and purify constituents of mixture of salt of iodine?
To separate salt and iodine, you can use sublimation. The iodine will sublimate at room temperature, leaving the salt behind. To purify the iodine further, you can re-sublimate it by heating it gently and collecting the vapor to form pure iodine crystals.
What are pure substances represented by?
change is re[resented by a chemical and a chemical formulasymbol
To what extent should the burden of proof be task upon the affirmative to prove?
I don't want to guess at what is being asked. Please re-word the question and re-submit
What is recrystallization?
Recrystallization is a process in which rocks actually change. It is whereby the crystals of one mineral slowly convert to few but larger crystals of the same mineral with out melting the rock. It is them followed the the process of neomorphism then metasomatism.2.Crystallization is the (natural or artificial) process of formation of solid crystals from a homogeneous solution or melt, or more rarely directly from a gas. This process is often used as a technique to separate a solute from a liquid solution, bringing it into a pure crystalline phase.
Why are crystals large in re-frozen ice cream?
The faster ice cream freezes, the smaller the crystals of water in it as they don't have much time to form - eg. if you are like Heston and use liquid nitrogen to make icecream it freezes really quickly and is lovely and smooth. This is also why icecream makers constantly stir the ice cream when it is freezing to keep the crystals small and the icecream stays smoother. Ice cream that has re-frozen has solidifed much more slowly so larger ice crystals can form - this not only affects the texture but also the taste of the icecream.
How can you prove that x iy r expia where rsqrtx2 y2 and aarc tanyx?
Can you re-write that...your question is quite ambiguous
How would you determine the purity of the solid crystals in crystallization?
One of the easier and more reliable ways to check if a solid compound is pure after re-crystallization is to check its melting point. Impurities will always lower the melting point of a sample, and the more impure, the lower the melting point will be. By checking the melting point of your sample with a reference value from a book or reliable internet source, it can be determined exactly how impure the sample is. If perhaps your compound is unknown, and thus are unable to obtain a reference value, you could obtain melting point of the sample, and then re-crystallize a few more times, obtaining a new melting point each time, until it is unchanged by re-crystallizing. This will of course decrease your yield, but if there is little fluctuation in your series of melting points, you can be sure you have a relatively pure sample.
When salt has been heated to melting point and allowed to cool does it reform into crystals or does it form a glass-like sheet as sand does?
Salt re-crystallizes, and the size of the crystals varies according to the cooling time. Salt does not form an amorphous state (non-crystalline glass) as silicon does.
