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Why is the melting point of aspirin not a reliable indicator of its purity?
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Can aspirin purity be tested using indicator and if so what one?
Yes, mel-temp
How do the melting and boiling point determine the purity of the substance and identify them?
*usually* melting point is a good indicator of a substance's purity. The technique of melting point determination is used frequently in organic chemistry labs.
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.
What can affect purity of aspirin?
Firstly place 100 to 150 mg of aspirin into a 125 ml conical flask. Next proceed to mix in 15 ml of 95% ethanol solution and add 2 drops of phenolphthalein indicator. Then use the titration method to mix this solution against a standard solution of sodium hydroxide from a burette. Using the value obtained from the titration calculate the molarity of the aspirin. Then calculate the ratio of the observed molarity of aspirin with its theoretical molarity and finally multiply this ratio with 100 to obtain the percentage purity of the aspirin sample.
How can you use a Mel-temp to check the purity of the aspirin?
A mel-temp is a very accurate way to measure the melting range of a substance. A pure substance will have a very narrow melting range, while an impure substance will have a wider melting range. Melting range begins at the temperature where the substance begins to melt, and it ends when the substance is a liquid. There are known values of the melting range of each substance available online. An adulterant will usually raise or lower this number Pure aspirin melts at 135 degrees C
When an obtained melting point range is broad what does it tell about the substance?
strong intermolecular forces attract the molecules
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.
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.
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.
How a termometer can be used to check the purity of a metal?
because gold or iron are metal if they are not a metal so they can not check the purity but they are metals..
How do you test for the purity of crystals formed?
You test it by checking the melting point
