the melting point of pure benzoic acid and pure naphthol are 122.5 and 123 degree Celsius respectively. you are given a pure sample that is known to be either pure benzoic acid or 2- naphthol. describe a procedure you will use to determine the identity of the sample.
Perform a mixed melting point; i.e., mix the unknown with pure benzoic acid and determine the m.p. If the unknown is benzoic acid the mixed m.p. will be 122.5 +/- a little depending upon how pure the unknown sample and pure benzoic acid are. If the mixed m.p. is lowered significantly, the unknown must be 2-naphthol. That will be sufficient to identify the compound BUT if you want to make sure, do a mixed melting point with pure 2-naphthol and the unknown
Well, first of all, it's good to know that we're dealing with some hot stuff here. So, to determine the identity of the sample, here's a clownishly clever procedure for you:
1. Step one: Grab some popcorn and find a nice melting point apparatus. Safety first, my friend! Ensure you have goggles and a lab coat. Safety can be fun too, you know.
2. Take a tiny sample of the mysterious substance and determine its melting point using the apparatus. Remember, you're looking for either 122.5°C or 123°C. It's all about precision, just like juggling flaming torches!
3. If the melting point is 122.5°C, buckle up, my friend, because the substance is as sharp as a benzoic acid! Celebrate by doing a victory dance. But be careful, we don't want any accidental spills!
4. If the melting point is 123°C, rejoice! You've got yourself a naphthol! Throw confetti in the air and shout "Naphthol-naughty!" (I apologize, I couldn't resist that one.)
5. If the melting point doesn't match either value, and you're getting mixed signals, it's time to dig deeper. Other tests, like solubility tests or spectroscopy, may be needed to uncover the true identity of our mysterious substance. It's like being a detective of the science world!
Remember, my friend, science can be fun, so perform the experiment with a smile. Just don't forget to record your observations and results. Good luck, and may the chemistry gods be with you!
To determine the identity of the given sample (whether it is pure benzoic acid or 2-naphthol), you can follow these steps:
1. Prepare a water bath: Fill a beaker or a suitable container halfway with water and heat it on a hot plate until it reaches around 70-80 degrees Celsius.
2. Obtain a small amount of the unknown sample: Weigh or measure a small amount (around 0.1-0.2 grams) of the unknown sample using a balance or measuring tool.
3. Test the melting point of the unknown sample: Take a capillary tube and open one end by gently heating it with a Bunsen burner flame. Insert the unknown sample into the open end of the capillary tube, ensuring it is placed inside securely.
4. Observe the melting behavior: Hold the capillary tube containing the sample over the water bath using a suitable holder or a clamp. Observe and record the melting point range displayed by the unknown sample as it is heated by the surrounding water.
5. Repeat the procedure: Repeat steps 2-4 at least two more times using fresh portions of the unknown sample each time. This will help ensure the accuracy and consistency of your results.
6. Compare the observed melting point with known values: Compare and analyze the melting point range observed in step 4 with the known melting points of pure benzoic acid (122.5 degrees Celsius) and pure 2-naphthol (123 degrees Celsius). If the observed melting point falls within the range of the known melting point of either benzoic acid or 2-naphthol, you can identify the unknown sample accordingly.
Note: It's important to note that this method relies on the assumption that the samples you have are pure and not mixed with other substances. In case the observed melting point range does not match either known value exactly, further confirmatory tests or techniques may be required to determine the true identity of the sample.
To determine the identity of the given sample, which could be either pure benzoic acid or 2-naphthol, you can employ the concept of melting point determination. Here's a step-by-step procedure to identify the sample:
1. Obtain a capillary tube: Start by obtaining a clean and dry capillary tube, which is a thin glass tube used for melting point measurements.
2. Fill the capillary tube: Using a spatula, fill the capillary tube with a small amount of the powder sample you want to identify. Make sure the powder is compactly filled into the tube without any air gaps.
3. Prepare a melting point apparatus: Set up a melting point apparatus, which typically consists of a heating device, such as a melting point apparatus or a melting point apparatus attached to a thermometer.
4. Calibration: Calibrate the melting point apparatus if needed, ensuring that the temperature readings are accurate.
5. Determine initial temperature range: Determine the initial temperature range for the melting point measurement based on the known melting points of benzoic acid and 2-naphthol (122.5°C and 123°C, respectively). For this case, start with a range between 100°C and 130°C.
6. Insert the capillary tube: Carefully insert the filled capillary tube into the heating block or melting point apparatus, making sure it is well positioned.
7. Begin heating: Gradually increase the temperature of the heating device while observing the sample inside the capillary tube. A heating rate of 1-2°C per minute is commonly used.
8. Observe the melting behavior: Keep an eye on the sample as the temperature increases. The melting point of the sample will be indicated by a clear change in the appearance of the powder, from solid to liquid. Note the temperature at which this occurs.
9. Record the melting point: Record the observed melting point of the sample.
10. Analyze the results: Compare the recorded melting point with the known melting points of benzoic acid and 2-naphthol. If the recorded melting point matches that of pure benzoic acid (122.5°C), then the sample is benzoic acid. However, if the recorded melting point corresponds to that of pure 2-naphthol (123°C), then the sample is 2-naphthol.
By following this procedure, you will be able to determine whether the given sample is pure benzoic acid or pure 2-naphthol based on its melting point.