what effect would each ofthe following have on the observed melting point range
ID: 685112 • Letter: W
Question
what effect would each ofthe following have on the observed melting point range of asample? a)filling the melting point capillary two thirds full. b)not packing sample tightly in the capillary. c)the presence of insoluble impurities such as glass and inorganicsalts in the sample. d)too rapid a heating of the melting point capillary. what effect would each ofthe following have on the observed melting point range of asample? a)filling the melting point capillary two thirds full. b)not packing sample tightly in the capillary. c)the presence of insoluble impurities such as glass and inorganicsalts in the sample. d)too rapid a heating of the melting point capillary.Explanation / Answer
a) filling the melting point capillary two thirdsfull. We have to put the capillary with the sample at the tipof the burner while determining the melting point of the sample.Inthis case only one third part of the capillary is at theburner & remaining is far away from this.Upon reaching themelting point ,the sample nearer to the burner is melts meanwhile this heat is absorbed by the sample far to the burner,sothere is some loss of heat by the sample at the burner. Tomelt all the sample in the capillary excess heat than that of themelting point is required by the sample.b) not packing sample tightly in the capillary. If the sample is not packed tightly then no sharpmetting point is not observed.If the sample is packed tightlythen upon heating & as the melting point is reached ,since allthe molecules in the sample closely bound then the heat istransfered from one molecule to other instanteniously , so themelting point is sharp. c) the presence of insoluble impurities such as glassand inorganic salts in the sample increases the melting point ofthe sample .Since some additional amount of heat is utilized by theimpurites .There by the melting point is excess than that ofthe actual value. d) too rapid a heating of the melting pointcapillary. On Rapid heating of the capillary we don't observe the sharpemeting point.Uniform heating is required.
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