0
Why is it important to pack the sample tightly in the melting point capillary?
Wiki User
∙ 13y ago
If left loose, the compound will be heated unevenly.
Wiki User
∙ 13y ago
Add your answer:
Earn +20 pts
Why is it important to pack the sublimate uniformly?
The melting point sample capillary tube has to be packed efficiently and uniformly, because air spaces can cause nonuniform heat transfer within the tube. This can inconsistency, with some parts of the sample melting before others, which results in poor reproducibility. A uniformly packed tube will melt consistently and evenly to give a sharp, reproducible melting point determination.
Sample speech about life?
sample speech about student life
How much ice water will it take to cool the sample to 20 degrees celsius?
That would depend on the mass of the sample, its temperature, and what the sample is made of.
What are the sample problems in free falling bodies?
Define "sample problems."
Will diffrent volumes of the same substance have the same density or different densities?
Yes. Density only depends on the substance, not the size of the sample. A pure drop of the substance has the same density as a pure truckload of the same stuff.
Why should each sample be tightly packet in melting poin tinto the capillary tube prior to heating?
It is Important to pack tightly in order to prevent the entrance of air into the capillary tube.
What is a capillary melting point?
The sample is placed in a sealed capillary and heated up to the melting.
Why is it important to pack the sublimate uniformly?
The melting point sample capillary tube has to be packed efficiently and uniformly, because air spaces can cause nonuniform heat transfer within the tube. This can inconsistency, with some parts of the sample melting before others, which results in poor reproducibility. A uniformly packed tube will melt consistently and evenly to give a sharp, reproducible melting point determination.
What steps can you take to determine the melting point of a substance that sublimes before it melts?
In such cases the melting point determination must be performed in a sealed capillary tube to avoid loss of sample. This can be achieved by heating the open end of the capillary tube, and with tweezers forcing it shut.
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 you can determine the melting point of a compound using capillary tubes and a digital melting point apparatus that need to be calibrated each time of use?
Melting points are ranges usually. It starts when the first crystal of the substance being tested melts and ends when the last crystal melts. Therefore the smallest sample possible and the slowest rate of heating will give the most accurate melting point.
What criterion is used for the purity of a sample of caffeine?
The closer the melting point of the sample of the caffeine you have extracted, to the known melting point of pure caffeine, the more pure your sample is.
What properties could be used to help determine whether the sample is rreally zinc?
Melting point of the sample & Density of the sample
What is Sample of physical change?
For example melting of lead.
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
How fast do you heat the sample when determining a melting point?
The apparatus used for determining the melting point will heat the sample at an appropriate rate. All you need to do is watch and note the point at which the sample melts, as should be demonstrated to you by your lab supervisor.
What is the term of melting point range?
The crystalline solids have a sharp melting point say 87oC but most of the amorphous solids do not have a sharp melting point they have a range of melting say they started melting at 87oC and continue till 89oC.
