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Why is the melting point of impure water lower than the melting point of pure water plus how can this be explained?
Mel135
the melting point of IMPURE water is lower because excess chemicals and sediments (and whatever else making it impure) get in the way of the water freezing directly by making it so that when the the water froze, it also had to freeze the sediments and chemicals (or else it wouldn't be frozen)
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∙ 14y ago
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Who has higher melting point Pure or Impure Substance?
The melting point of an impure compound is almost *always* lower than that of a pure compound.
Is the melting point of impure water lower or higher than freezing point?
The boiling Point of impure water is 100 degrees celsius
Is a sharp melting point for a crystalline organic substance always indicates a pure single compound?
Nope; not always. So the answer would be false. You have to realize that there might be impure substances mixed. Likewise impure substance can either lower the melting point or increase it :)M. Bilal :)
Why is it important to determine the melting range of the impure and recrystallized sample of vanillin?
The melting point is an indication of purity.
Why is it important to determine the melting ranges for the impure and recrystallized samples of vanillin?
The melting point is an indication of purity.
If a substance is impure what will be the two effects on its melting point compared to the literature value?
the impurities will lower the melting point value.
What will melt faster pure or impure naphthalene?
Remember that the more impure the lower the melting point.
Who has higher melting point Pure or Impure Substance?
The melting point of an impure compound is almost *always* lower than that of a pure compound.
How is the melting of an impure compound expected to change with recrystallization?
The melting point of an impure compound will become closer to that of the actual melting point of the pure substance with recrystallization of your mixture.
Is the melting point of impure water lower or higher than freezing point?
The boiling Point of impure water is 100 degrees celsius
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.
Is a sharp melting point for a crystalline organic substance always indicates a pure single compound?
Nope; not always. So the answer would be false. You have to realize that there might be impure substances mixed. Likewise impure substance can either lower the melting point or increase it :)M. Bilal :)
When the observed melting point is less than the stanadr value what inference will you get?
The substance whose melting point is being observed is impure.
Why is it important to determine the melting ranges for the impure and recrystallized samples of vanillin?
The melting point is an indication of purity.
Why is it important to determine the melting range of the impure and recrystallized sample of vanillin?
The melting point is an indication of purity.
Why is it important to determine the melting ranges of the impure and recrystallized samples of vanillin?
The melting point is an indication of purity.
What is purity criteria?
The criteria of purity of a compund isÊdetermined at it melting point.ÊA pure compound a definate melting point. While an impure substance has an indefinate melting point.
