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Why will the observed melting point range be lower than true value if we heat the sample too fast?

A lower and wider melting point range could indicate that the sample was contaminated with trace amounts of impurities.


How would one determine whether a given sample of aspirin is pure or not?

One way to determine the purity of aspirin is through a melting point test. A pure sample of aspirin will have a specific melting point range, so comparing the observed melting point to the known range can indicate purity. Additionally, techniques such as chromatography or spectroscopy can be used to analyze the composition of the sample.


How can I get melting point by using Onset and Clear Points?

To determine the melting point using onset and clear points, heat the sample gradually and observe the temperature at which the first sign of melting occurs (onset point). Continue heating until the sample is completely melted and note the temperature at which the sample becomes transparent (clear point). The melting point is typically reported as a range between the onset and clear points.


What effect would too rapid heating have upon apparent melting point of a compound?

Too rapid heating can lead to an inaccurate measurement of the melting point, as the heat may not be evenly distributed throughout the sample, causing the melting point to appear lower than it actually is. This can result in a broadened melting range or even a false melting point. It is essential to heat the sample gradually to obtain an accurate melting point.


What is the effect of incomplete drying on melting point determination?

The melting point will be lowered and broadened. Incomplete drying of a sample may result in the presence of impurities. When impurities remain present in a sample, the melting point is both lowered and broadened. For example, if the normal mp of a substance is 104C - 106C, an improperly dried substance may contain impurities thus lowering and broadening the melting point range to something like 85C - 97C. (Note: these numbers are just arbitrarily chosen for the purpose of the example).

Related Questions

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.


How does the melting point of the crude sample compare with that of the purified sample?

An impure sample will have a lower melting point, and will also have wider melting point range than that of a pure sample of the same substance. a sharp melting point range can also indicate a eutectic mixture


Why will the observed melting point range be lower than true value if we heat the sample too fast?

A lower and wider melting point range could indicate that the sample was contaminated with trace amounts of impurities.


How would one determine whether a given sample of aspirin is pure or not?

One way to determine the purity of aspirin is through a melting point test. A pure sample of aspirin will have a specific melting point range, so comparing the observed melting point to the known range can indicate purity. Additionally, techniques such as chromatography or spectroscopy can be used to analyze the composition of the sample.


What is the term of melting point range?

The melting point range refers to the temperature range over which a substance transitions from a solid to a liquid state. It is the interval in which the solid begins to melt and continues to completely liquefy. This range is typically represented by a lower and upper temperature limit.


How can I get melting point by using Onset and Clear Points?

To determine the melting point using onset and clear points, heat the sample gradually and observe the temperature at which the first sign of melting occurs (onset point). Continue heating until the sample is completely melted and note the temperature at which the sample becomes transparent (clear point). The melting point is typically reported as a range between the onset and clear points.


Why is it important to determine the melting ranges for the impure and recrystallized samples of vanillin?

Determining the melting ranges of impure and recrystallized samples of vanillin is important because it helps assess the purity of the compound. A narrower melting range for the recrystallized sample indicates higher purity, while a broader range for the impure sample suggests the presence of impurities. This information is crucial for quality control and ensuring the vanillin is suitable for its intended use.


What effect would too rapid heating have upon apparent melting point of a compound?

Too rapid heating can lead to an inaccurate measurement of the melting point, as the heat may not be evenly distributed throughout the sample, causing the melting point to appear lower than it actually is. This can result in a broadened melting range or even a false melting point. It is essential to heat the sample gradually to obtain an accurate melting point.


What is the effect of incomplete drying on melting point determination?

The melting point will be lowered and broadened. Incomplete drying of a sample may result in the presence of impurities. When impurities remain present in a sample, the melting point is both lowered and broadened. For example, if the normal mp of a substance is 104C - 106C, an improperly dried substance may contain impurities thus lowering and broadening the melting point range to something like 85C - 97C. (Note: these numbers are just arbitrarily chosen for the purpose of the example).


When an obtained melting point range is broad what does it tell about the substance?

strong intermolecular forces attract the molecules


What effect would contaminating the sample with an insoluble impurity have on the melting point?

Soluble impurities (that is, impurities that are included within the crystal matrix) tend to lower the observed melting point and broaden the melting point range. Insoluble impurities have no effect on the melting point. Found from website: http://swc2.hccs.edu/pahlavan/2423L1.pdf


What would be the effect on the observed melting point if sample was too small?

Using too large of a sample when determining its melting point will flaw your results since, if the sample is too large it will be harder for the sample to melt in the melting point apparatus.