Iodine was added to help visualize the process. It was yellow/brown in the water layer and purple in the organic. Glad the video was helpful.

@laurikrapf6460

4 жыл бұрын

Hi can you remember what the concentration of the iodine solution was? What would be the maximum amount of iodine I could have if I were to record the changes in iodine concentration of the aqueous phase after multiple repetitions of the extraction?

@yinu9320

3 жыл бұрын

after 4 years, it still helped me thank you

@janewissinger7811

3 жыл бұрын

@@yinu9320 happy to hear.

I love that you poured the organic layer from the top of the funnel to prevent contamination from the aqueous layer. Other experiments do not do that but I love that lab etiquette and I'll do it in my lab classes.

Thank you VERY MUCH Dr. Wissinger for posting this! I'm leading a lab on this tomorrow. Thank you for your super clear directions! :)

Starting a new lab tech job tomorrow and enjoying these videos as a refresher. Thank you :)

I did not have any idea about liquid extraction before watching it. Very well explained. Thanks.

Thanks for this video. I am about to go into lab so this was helpful to watch.

Wow, thank you for your videos. It helped me a lot. I can't believe that this was posted in 2014 and it is 2021 now but still helpful.

Nice explanation! Thanks, Professor Wissinger. :)

A trash quality summary of this video for people rushing for Friday's planning question (RI) (do not trust this I think I may have severe misconceptions but wtv) First, determine whether solute is migrating from aqueous>organic or organic>aqueous. this can be determined via solubility values. Also determine which layer will be the top layer and which layer is the bottom layer (density) preparation steps: 1. Add some water to separatory funnel to test that stop cock does not leak. 2. Lightly grease stopper with vaseline and invert separatory funnel filled with water to check that liquid does not leak out (may be used as a "precautions" point too 3. Label 2 conical flasks: -aqueous phase -organic phase Procedure: 1. Fill separatory funnel to about 2/3 with solute* in aq/organic (depending on question: example in video>aqueous iodine) [fill it 2/3 with the thing u want to separate something from] 2. Then fill separatory funnel 1/3 with solvent aq/organic (again depends on qn, in video, cyclohexane) 3. Place stopper onto top of separatory funnel 4.Carefully lift separator funnel off of the ring stand. 5. Holding the stopper in place, slowly do an inversion of the separator funnel. 6. Open the stop cock to release any pressure that might build up. 7. Close the stop cock and mix the phases by shaking the separator funnel. Open the stop cock periodically in between shaking to prevent build up of pressure. 8. Invert the separatory funnel the right way around. Swirl the liquids and place separatory funnel back onto ring stand. 9. Place aqueous/organic phase labelled conical flask (corresponding to denser/bottom layer) under separatory funnel, remove stopper and slowly open stopcock. 10. Drain aqueous/organic phase out of the bottom of the separatory funnel 11. slow down and stop draining just as meniscus of the top layer reaches the neck of the separatory funnel 12. Lift separatory funnel from iron support, remove stopper and pour top (organic/aqueous based on density) layer out from the top of the separator funnel into conical flask labelled aqueous/organic phase. 13. Continue extraction by returning aqueous/organic phase (your original phase! like here aqueous iodine so the aqueous phase) to the separatory funnel and repeat extraction steps 3 times in total to ensure as little solute remains in the aqueous/organic phase as possible. PRECAUTIONS: 1. Wait until layers separate before draining separatory funnel to prevent contamination of aqueous and organic solutions 2. Be careful not to knock the stopcock against the iron ring while placing separator funnel back onto iron ring to prevent spilling of liquids 3. Do not do one large extraction instead of several extractions as a lot of solute will remain in the aqueous/organic solution (original solvent) [hmm not sure if this is a precautionary step] 4. (MOST IMPORTANT) Be sure to watch the tip videos by Katie and Eric about draining separatory funnels lol. reply to add more notes if you catch other stuff from both videos Good luck planning sucks

@danielabarnes7729

2 жыл бұрын

Thx so much chief

Well demonstration from the expert!

such a wonderful explanation, thank you so much!

Great video!

Thank you so much this was very helpful!

thank you ! great video , I have a question though , let's say that we have two liquids that we want to separate , so we should have one component which has a high partition coefficient and for the other component should have a smaller value for the partition coefficient ? how is K related to solubility ? thanks!!

very well discussed. thankyou!

thanks for the video, really helpfull

Easily understandable! Thank you Madam.

@srinivasthumma5827

5 жыл бұрын

Nice explanation....

Nice presentation! Off to the rotavap you go😅

Wow brilliant.. Thank u

nice explanation

what was the reason for the organic layer turning purple? p.s Very helpful video! thank you so much!

Thank you teacher

This is so cool!

Oh my god. Thank you so much!!!!!!

this is great, thank you

Can someone tell me the chemical equation for iodine water?

Letting it just sit there builds up pressure again you shouldn't let it "settle"

tuqa gang

does anybody know the mechanism for this?

so much wow

can someone tell me what are the materials or apparatuses that are being used in the video? that would be a great help for me with my research huhu. xoxo thanks💓

@priscilla.gerard

3 жыл бұрын

Aqueous phase = water, organic phase = cyclohexane. Solute = iodine. Apparatuses = separatory funnel, iron ring, iron stand, Erlenmeyer flask, and measuring cylinder. I am probably too late, but I hope it helps :)

Thank you

Thanks♥️

Well done!! Thanks!!

How can be extracted two polar compound in from solvent phase

@adelawad1111

5 жыл бұрын

.

I am a cancer patient and i need to make my own THC oil. How can i do this using a soxhlet?

I hate chemical engineering