I have used your videos for help when writing almost every single one of my lab reports for organic chem 1. Thank you so much for taking the time to make the videos and including such helpful diagrams. Your way of explaining is so effective - it really helps with understanding the theory behind all these experiments.
These videos are very great for actually understanding the science behind each experiment. My organic lab doesn't really teach conceptually anything, they just give you a procedure and you follow it. Thanks!
Thanks, Professor Davis, I haven't watched the whole video yet, I am sure this video is going to be useful for me already. Please keep helping students by making these kinds of videos! You saved a lot of my time
Omg thank you so much for this video. It helped in a crunch. Having to write our first lab notebook and I was so co fused as to why melting point depresses. Really effective as I am a visual learner, and you instruction was simple, concise and to the point. Thank you.
so glad you appreciated it! I am hoping to produce a few more videos later this summer. Don't forget to subscribe to get notifications when new videos go up!
loved this video. you hinted that you would go into more detail of the "range of melting temps" (2:40) for impure mixtures. i would find that information interesting. I looked around for a bit but couldn't find anything like that. did you ever make a video on that?
so if a compound is pure and an impurity with a much higher melting point is added, will the melting point of the new solvent be somewhere in the middle?
+Orgo Keigxan Theoretically, not necessarily. In a very simple, very well-behaved system like the one you describe, the melting point of the pure sample would still be depressed by the addition of a SLIGHT amount of the high-melting impurity. But here is the catch, the eutectic composition of such a mixture is likely to be very close to the original pure compound (maybe 95%, for example), so depression of its melting point is only observed when a very small amount of the second compound is added. Once you cross the eutectic point, melting points will begin to increase again and our assumptions about depression go out the window! This is exactly why only a small amount of standard is added during mixed melting point tests. If you cross the eutectic your results will be ambiguous. If you are performing a mixed melting point analysis, then obviously you aren't sure what you have or what its phase diagram looks like. So, to be sure that melting point depression happens for every additive except for the original compound, we only add a pinch of standard just in case we are wrong!
I have used your videos for help when writing almost every single one of my lab reports for organic chem 1. Thank you so much for taking the time to make the videos and including such helpful diagrams. Your way of explaining is so effective - it really helps with understanding the theory behind all these experiments.
Well explained. 2023 and this video is clear, concise, and informative!
Thank you.
These videos are very great for actually understanding the science behind each experiment. My organic lab doesn't really teach conceptually anything, they just give you a procedure and you follow it. Thanks!
Glad you found it helpful! That always drove me crazy when I was a student, too!
Wow. I wasn't sure anyone actually stuck around for the website plug. I appreciate the support!... now go buy something :-)
almost 8 years later and this video is still everything i could ask for trying to understand melting point depression!
Thank YOU
Thanks for watching (and sharing!). This is one of my all-time favorites from my channel, too :-)
thank you!! this was confusing me so much but you explained it so simply ❤
Glad it helped... that's why I make the videos B-)
Thanks, Professor Davis, I haven't watched the whole video yet, I am sure this video is going to be useful for me already. Please keep helping students by making these kinds of videos! You saved a lot of my time
I certainly plan to. Please help me to help others by subscribing and sharing!
Wow.... Well explained.... This channel needs more views and subscribers... thanks
Omg thank you so much for this video. It helped in a crunch. Having to write our first lab notebook and I was so co fused as to why melting point depresses. Really effective as I am a visual learner, and you instruction was simple, concise and to the point. Thank you.
Bless your soul bcause i just so happen needed to explain the structure of benzamide and how the melting point is observed due to its structure.
Thank you Buddy! It was a great explaination about the point! Cleared my doubts! Keep going!
so glad you appreciated it! I am hoping to produce a few more videos later this summer. Don't forget to subscribe to get notifications when new videos go up!
Thank you for explaining the reasons for melting point depression in terms of intermolecular forces!
loved this video.
you hinted that you would go into more detail of the "range of melting temps" (2:40) for impure mixtures. i would find that information interesting. I looked around for a bit but couldn't find anything like that. did you ever make a video on that?
+1
I enjoyed this video, and actually understood it clearly. Thank you :)
This was very useful, thank you!
I agree!
THANK YOU THANK YOU... IVE BEEN BOTHERED BY WHICH IS WHICH BUT THIS CLARIFIEDDD EVERYTHINGG.
Glad it helped! Please subscribe and share it with students, friends and teachers :-)
awesome. did you ever make the follow up vid?
Sure did. Here you got. ruclips.net/video/7Ym-QyLpsiE/видео.html
Can I have the references for these reasons of melting point depression?
so if a compound is pure and an impurity with a much higher melting point is added, will the melting point of the new solvent be somewhere in the middle?
+Orgo Keigxan Theoretically, not necessarily. In a very simple, very well-behaved system like the one you describe, the melting point of the pure sample would still be depressed by the addition of a SLIGHT amount of the high-melting impurity. But here is the catch, the eutectic composition of such a mixture is likely to be very close to the original pure compound (maybe 95%, for example), so depression of its melting point is only observed when a very small amount of the second compound is added. Once you cross the eutectic point, melting points will begin to increase again and our assumptions about depression go out the window!
This is exactly why only a small amount of standard is added during mixed melting point tests. If you cross the eutectic your results will be ambiguous. If you are performing a mixed melting point analysis, then obviously you aren't sure what you have or what its phase diagram looks like. So, to be sure that melting point depression happens for every additive except for the original compound, we only add a pinch of standard just in case we are wrong!
great question (and answer)
A very good video .i liked it thanks
Thank you so much!
thank you!
nice
tell your wife to stop hating I'm trying to learn here