"Salting Out" Effect of Water and Methyl Alcohol

Рет қаралды 101,155

11 жыл бұрын

Alcohol and water are completely miscible, until you add potassium carbonate. Hydrogen bonding is always the answer.
This video is part of the Flinn Scientific Best Practices for Teaching Chemistry Video Series, a collection of over 125 hours of free professional development training for chemistry teachers - elearning.flinnsci.com
ATTENTION: This demonstration is intended for and should only be performed by certified science instructors in a safe laboratory/classroom setting.
Be sure to subscribe and check out more videos!
Subscribe: kzfaq.info/love/inn...
Facebook: / flinnscientific
Website: www.flinnsci.com/

Пікірлер: 63

@MichaelCzajka 4 жыл бұрын

You managed to combine ionic interactions, hydrogen bonding and the separation of two miscible solutions utilising the difference in one short video. The affinity the different ends of water molecule have for the (K2CO3) 2K+ CO3- was also nicely explained. Those small interactions really do matter... and visualising them clearly is the key to making chemistry much more interesting. Thanks :-)

@jhyland87 4 жыл бұрын

Your drawing actually cleared this up quite a bit for me... Thank you!

@justabrokemillenial4715 4 жыл бұрын

Thanks, this helped me understand the relationship between water and methanol once you introduce salts

@matthewmickelson6231 10 жыл бұрын

Very helpful! Great visual explanation

@MsTommyknocker 10 жыл бұрын

I really appreciate this upload

@laserfloyd 10 жыл бұрын

Nice explanation. I just recently did something similar with isopropyl alcohol and sodium chloride.

@Livelikehell 11 жыл бұрын

Very nice video. Thanks a lot!

@miguelmouta 11 жыл бұрын

You did help me a lot, for beggining studying proteomics .mfm MD.

@hasanabdulkareem8862 10 жыл бұрын

شكرا جزيلا على الشرح المفصل

@artandcraftchannel13 5 жыл бұрын

I have a question. What is the product and the anion of the following ? Salt solution+ methanol +sulphuric acid ----> ?.

@adamomar8401 11 жыл бұрын

Great vedio. Thanks a lot!

@drewdemien481 Жыл бұрын

that was really great.

@ankitganwani7822 2 жыл бұрын

Name and use of red colour solution in this extraction

@orhantokur7811 Жыл бұрын

Bravo!

@henrym.5884 3 ай бұрын

Thanks .

@nickyfox2977 10 жыл бұрын

is there a test like this you can do in a test tube to seperate or test for methanol in ethanol want to test for the methanol in ethanol even trace amounts

@spookywizard4980 6 жыл бұрын

Nicky Fox No way, something like that would need a much more precise test

@tommasopetrella4856 9 жыл бұрын

I think these video's are great, but unfortunately no one answers the questions people have about the experiment. I know this series is intended for teachers, but many of us watching are not and a response to some of the better questions would help us out a lot. Thanks.

@NikGPunto 7 жыл бұрын

Tommaso Petrella

@tommasopetrella9278 10 жыл бұрын

So has this in effect concentrated the methanol by separating the water, and if so is this a viable option to remove water from methanol?

@spookywizard4980 6 жыл бұрын

Tommaso Petrella somewhat, but you'd have the potassium carbonate solution to deal with. Easiest way would be just to distill methanol from the water because they have very different boiling points. The methanol produced in this is still 'wet' with water, not all of it separates

@spookywizard4980 5 жыл бұрын

Are there any other salts besides potassium carbonate that work for methyl/ethyl alcohol? I'd like to try this demonstration and I have a variety of salts but I'm lacking potassium carbonate.

@Tuyo420 2 жыл бұрын

sodium carbonate

@spookywizard4980 2 жыл бұрын

@@Tuyo420 didn't work

@Colonies_Dev 5 жыл бұрын

I'm about to do an extraction and I'm using this principle to separate an indole based molecule 😄

@bryton909 4 жыл бұрын

Are you talking A/B?

@off6006 4 жыл бұрын

i wonder what this indole is ;)

@saudkhanmychannel4471 Ай бұрын

Good

@j187sd 10 жыл бұрын

"salute" haha

@Xurreal Жыл бұрын

Ironically I feel I am beginning to understand how digestion really works, and how you can really screw it up (especially around bedtime)

@flxmkr Жыл бұрын

I'm impressed by that magnet stirrer! Where can I get one? What happens if we add a goldfish? Don't be mad. We don't advance without curiosity. 😁 I'm not serious. Don't add the goldfish. But the presentation really was interesting. Thank you.

@revimfadli4666 11 ай бұрын

Your local chemistry supply store I guess?

@dannyharris2846 4 жыл бұрын

what did you pour in their to make ethanol. or how much water do I add to a gallon of methanol to make ethanol

@Almagells 2 жыл бұрын

are you crazy, or chemistry incompetent?

@flxmkr Жыл бұрын

She told you in the video. Half ethanol and half h2o.

@michaelmolter6180 10 жыл бұрын

But why doesn't the hydroxyl group on the methanol also hydrate the ions?

@MsTommyknocker 10 жыл бұрын

That's a good point. I was wondering about that myself. I think it's because potassium carbonate is ionic, "with a big I" whereas methanol will have that non-polar methyl group. All things equal the most polar things (water and KCO3) will stick together

@priyankighosh6877 7 жыл бұрын

MrTommyknocker That's because water has a polar covalent bond i.e., it has slight positive and negative charge due to the high electronegativity difference between hydrogen and oxygen. Whereas methanol has a non-polar covalent bond, meaning no charge between the hydrocarbon and hydroxy group.

@spookywizard4980 6 жыл бұрын

Michael Molter It's because methanol is less polar than water. The -CH3 group is more nonpolar than a hydrogen would be on the water.

@9319Shoeb 4 жыл бұрын

H bonding is always the answer cracked me up hahahhahaha

@tag7299 4 жыл бұрын

Potässium

@mirzarashidbaig8008 2 жыл бұрын

nice vedio

@viewthedr 9 жыл бұрын

How about salt(NaCl) instead of potassium carbonate?

@spookywizard4980 6 жыл бұрын

K.U. Kim I was wondering why they didn't use it. It would still work, but perhaps not as well. Sodium chloride would only dissociate into 2 ions, Na+ and Cl- whereas potassium carbonate dissociates into 3, two K+ and one CO3(2-)

@scadvijay 2 жыл бұрын

Solubility also matters.. NaCl solubility in ethanol is 650mg in 1L K2CO3 is insoluble

@jackmclane1826 2 жыл бұрын

Why Potassion carbonate? Why not table salt?

@christopherblackhall2832 2 жыл бұрын

Lower solubility in methyl alcohol

@komisariatnr3127 2 жыл бұрын

I distilled vodka in this way and it was impossible to drink this spirit. Alone salt?

@christopherblackhall2832 2 жыл бұрын

Use dipotassium phosphate

@troubledseed 3 жыл бұрын

im just going to add *Poe-taaaaassssss-ium Carrrrrbonate*

@darrellbellaart4158 2 жыл бұрын

zoom in a little

@marchizaaa 3 жыл бұрын

Tons of salt, too much efforts to separate alcohol from water. This is not sustainable at industrial level, unless you distill. Remember that if you acidify It, you will go back to one phase again

@dannyharris2846 4 жыл бұрын

for hand cleaner.i burn this meth in my race car,and we can't race.i need to make hand cleaner