two substances,a and b have same melting point.How can you determine if they are the same without using any form of spectroscopy? Explain in detail.
If they are the same compound then the melting point of a mixture will be the same as a and b. If a and b are different compounds then a mixture of the two will have a different (lower) melting point than a and b.
what is the structure of phenylhexane?
It is not a good idea to piggy back questions because it looks as though the original question has been answered, so one looks at the next.
I have answered the hexyl benzene question above.
To determine if two substances, A and B, with the same melting point are the same without using any form of spectroscopy, you can perform a simple experiment called a mixed-melting point test. Here's a step-by-step explanation of how to do it:
1. Start by obtaining small amounts of substances A and B in pure form. Make sure you have enough of each substance to perform the test multiple times if necessary.
2. Next, mix a small amount (a pinch) of substance A with an equal amount of substance B in a test tube or a small capillary tube. Ensure that the mixture is thoroughly blended.
3. Prepare a separate control sample for each substance by placing a small amount (a pinch) of pure substance A in one test tube or capillary tube, and also a small amount (a pinch) of pure substance B in another test tube or capillary tube.
4. Now, it's time to heat the mixtures. Use a melting point apparatus or a Bunsen burner to gradually heat the pure substance A control sample, the pure substance B control sample, and the mixture of A and B. Observe the melting points of all three samples.
5. If substance A and substance B are the same, then the mixture of A and B will exhibit a single, sharp melting point that matches the melting point of the control samples. In other words, all three samples will melt at the same temperature.
6. However, if substance A and substance B are different, then the mixture will have a lower melting point than the melting points of the control samples. The melting point of the mixture will show a broadening or depression below the expected melting points.
7. Repeat the experiment several times to ensure consistency in the results. If you consistently observe a matching melting point for the mixture, it suggests that substances A and B are likely the same.
It's important to note that this method only demonstrates similarity based on melting point, not chemical identity. To confirm the exact nature of substances A and B, spectroscopic techniques like infrared spectroscopy or mass spectrometry would be necessary.