Fehling's test

In this video is shown how to perform a fehling's test and how to prepare fehling's solution. As an example different sugars are tested.
Patreon: / randomexperimentsinter...

[@abhayanand9585]

Wonderful Demonstration as well as explanation!

[@stop_procrastinating2379]

Just wanna thank you from 9 years ago. I'm a visual learner and this helped me with my final project 😅

[@RaExpIn]

That's nice to read! You're welcome! :)

[@MehvishFatema026]

Thank you so much This made easier to understand the test

[@Boring_bug]

Very nice explanation!

[@sanatani7660]

super cool video! the part about water bath was helpful. And also I didn't know about the toxicity of cuso4. Thank-you!

[@EtherealRoninERProductions]

If you want to remind yourself of this easily, think of that among us task where you test 4 or 5 test tubes and they are all blue, when you check back on it one of them turns brick red, I never knew that was added in that game until when I first learnt about this

[@averageanon007]

how do you remember the among us task

[@werallgnnadieintheend]

oooh yeaaah🤓😯🤗

[@xx-zp4or]

@@averageanon007 He is an Among us kid

[@Uma_Vlogz]

I could never complete that task actually

[@sankalpyadav2926]

Thank you sir You made life easy

[@osabnis]

Very good explanation

[@Garima8532]

Thanks you sir this helps a lot

[@jomo3480]

Great video

[@sintayehukochito903]

An excellent explanation.

[@nithinthogiti6289]

Lots of information bro

[@belenghohn7093]

great quality video

[@himadribiswas852]

Nice explaination

[@IshratJahan-hr1rl]

Good job

[@sukhendumukhopadhyay4219]

it helps me a lot

[@saeedahmadkhan8554]

Love u

[@jovanakostencova1813]

Im doing this at the science month on 23 of november Its proving glucose in honey and i need to explain everything that happeneds and why..the expiriment is a bit short so i wanted to see a video explanation so that i know more things that i can say there.Didnt see more than i knew but thanks!

[@madara.n]

This helped me a lot. Thank you!

[@geetikasingh3936]

Good explanation and really helpful

[@nahulaluckshman9489]

thanks a lot

[@souvikroy11]

Very nice.

[@taranveer3370]

Thanku very much 😊😊

[@lalitmohan4445]

If we see all the organic reaction pratically we an under stand better

[@poojakumari-qj6im]

Very nice

[@knowingchemistry735]

great explanation...sir u made my day !!

[@benanerad2173]

so good!! this is what i need thank you love u

[@1dan1609]

Thank you so much

[@fatimanaveed5269]

Ty

[@susmitamondal4795]

Thank you .

[@bamboomed215]

well done

[@nishanirajapaksha587]

thank you

[@lakshaydhull7527]

Amazing

[@ansaricraft8051]

Keep up man

[@divyamtaneja1835]

Thanks

[@anushkamishra7926]

What about fructose content sir . How to find it ?

[@israelaster9111]

it is very nice and help full

[@deepikabharti9909]

Thanks for the awesome video.

[@atrimdas1534]

brilliant

[@porvik.sharma]

but you didn't told us if Aromatic Aldehydes give fehling test ?

[@AuroraBorealis850]

But though explanation was nice i got it nd appreciate you

[@Naturevs]

Lia qiao ...can yu tell me aboute Qualitative test name for monosacride oligosacrides and polysacrid i waiting fr yu

[@joaomateusciprianodasilva5201]

so cool man

[@joleyreliquias2547]

Why are Fehling’s A and B solutions made separately when they would be mixed afterwards?

[@RaExpIn]

It's just to increase shelf life. The complex would slowly decompose after a while, while these two solutions can be stored for months or even years.

[@firdouseflower6550]

Why fehling test doesn't give positive results with benzaldehyde؟؟؟answer the question please

[@Nafizul44]

It wont react cause its not contain aliphatic aldehyde

[@bikramroy3783]

Darun

[@HariharanAnnadurai]

thx a lot

[@vedanapunsuk4938]

3rd one looks tasty

[@unnikrishnanthaliyil9590]

Thanks....... 🙏😇

[@seblm_g3211]

This is why Germans are needed for chemistry

[@rubellite5766]

Really helped a lot

[@bera9919]

teşekkürler organik kimya gecenin bu saatinde izlediğim videoya bak!!!

[@HighAltitudeEnjoyer]

I smelled large amount of vapours of fehlings sol a+b+atetadehyde... Is it harmful

[@vgcxv3183]

6. What are the disadvantages of Fehling's test

[@RaExpIn]

It reacts with all kinds of reducing compounds and sugars. So it can't differentiate between aldoses and ketoses or other compounds like formaldehyde and acetaldehyde. To differentiate aldoses and ketoses the seliwanow test can be used.

[@alaababat4561]

Thank yooou it was helpful 😊

[@AbdulHakeem1.0]

Nice

[@이주현-i3i]

Excuse me, can I ask you why the sucrose + citronensäure(citric acid anhydrous) mixture shows the color change? I want to know the principles behind that.

[@이주현-i3i]

If you can explain for me, I'd be very happy. [e-mail] this is my e-mail address. You can send me an e-mail for additional explanation. Have a nice day ! :)

[@pigeonlove]

How thick do you have to be to write all that out instead of googling it yourself

[@tanmay______]

It's been four years, but I'm writing so that someone else doesn't have to google. Basically, sucrose doesn't give the Fehling's test because the aldehyde group (-CHO) is locked up inside the ring due to the glycosidic bond formed. But this glycosidic bond can be broken up in acidic environments, so when the citric acid is added along with the sucrose, it breaks down into glucose and fructose, which are the constituent molecules of sucrose. The glucose and fructose molecules are the ones which give the Fehling's test and the solution then turns brown.

[@sunnysadhwani7762]

Fehling's solution test-🤕🤒😞😖😭in this test aldehyde react with 2 molecules of copper sulphate and also with two molecules of sodium carbonate gives CO2 which is called as brick red precipitate with its byproducts carboxylic acid with 2 molecules sodium sulphate and 2 molecules of water

[@shamilathahir6283]

really helpful

[@alebass2948]

Can you also explain the reaction if you add starch or lactose in a fehling's solution? this is for my research x3 thanks inn advance

[@RaExpIn]

Theoretically amylose is a reducing polysaccharide, because the anomeric carbon atom is at the end of the chain. Nevertheless as far as I know, due to the large molecular weight, the number of functional groups per gramm is too small to get a visible reduction of copper. In lactose (3:45) you can see that the anomeric carbon atom of the glucose is not connected to the galactose. So the ring is able to open, while the connection from the 4th carbon atom of the glucose to the 1st one of the galactose stays.

[@alebass2948]

Thank you thank you so much! TBH i have learned more stuff about this experiment than in my class XD... i will recommend this vid to my teacher and hope she will learn something from it too (>-

[@RaExpIn]

You're welcome :D

[@belenghohn7093]

Thank you!!

[@sanjaysanjay-zx9ph]

Sir you explain in kannada please

[@razitok3069]

how this occur

[@sunnysadhwani7762]

in the form of reaction RCHO+2CuSO4+2NaCO3=RCOOH+2Na2SO4+CO2+H2O

[@sibghatullahsherazi9586]

❤

[@OmPrakash-ej2xb]

Please translate in hindi sir

[@OmPrakash-ej2xb]

I dont understand okeyyyyy

[@mazinmohammed7161]

there's no such thing as splited**

[@RaExpIn]

As you can hear I'm a non-native speaker and scientific language is even more difficult. So, I guess this happens quite often in my videos... My goal is that people understand what I'm talking about :)

[@harshjain3122]

@@RaExpIn it's alright bro. As u can see, he liked his own comment. So no one agree with him

[@niyatiaghera4871]

thank you

[@puttarajuv.r987]

Thanks

[@S.P.M.P.N.Karunathilaka]

❤