The Winkler Method

[@ETiDeQuenVesSendo]

In the 3:25, after adding the acid, the bottle contains some fraction of the initial iodide ions and some iodine molecules. Is that what it makes it look orange?

[@asimplenaturalist3902]

The presentation was awesome. Easy to understand, thanks a lot.

[@paulasarebekoe6299]

Helped me a lot in my exams.. Make more of this

[@angielicacabugsa8810]

may I ask what is the chemical formula of Alkali-iodide-azide? Thanks for the response

[@CheckAvailabilityYo]

Thanks for the easy to follow presentation.

[@kosgeihillary]

what a powerful presentation. that presentation is clear and precise. thanks

[@ballapranavachaitanya3975]

thanks really helped good for revision before lab exams

[@sathyajitha9541]

its MnO2 and not MnOH2 incase of brown precipitate

[@kutluhankahraman6795]

what is the molarity of the sodium thisulfate? 10mmol ?

[@dr.nohaelnagdi415]

Does anyone know how did she get that each 0.1 ml thiosulphate is equal to 1 ppm DO?

[@simonpeterogwal7150]

I truly like this presentation. God bless you Miss Berkeley

[@sarbeshvenkat3849]

what are the concs of both manganese sulfate and the alkali iodo azide solutions

[@gilla7243]

Is there a replacement for maganese sulfate?

[@vu3dfq864]

it helped me a lot during ma exams tqs alot!!!

[@tamaraanand2968]

At 2:53 what is the name of the product formed? And what is the formula?

[@zadejoh]

It's manganese sulfonate, I'm pretty sure the formula is Mn(SO4)2

[@tamaraanand2968]

+Zade Johnston thank you!

[@IamDoubleP]

Thanks, this will be useful for my class.

[@87syakindaichi]

Do This kit suitable to bring during site sampling.. ?? I mean how long do it take for one measurement to complete.. Is it can reach to 20min(if required long time titration)

[@Asmabs004]

SMART demonstration. Thank you.

[@phy_ke]

What does it mean when the sample does not turn blue after adding starch?

[@kutluhankahraman6795]

no Iodide is present in the solution

[@kashmirshenaz269]

Who else is here after Dulan Sir’s recommendation? 😁

[@elitegamer4705]

Dulan Maduranga. 🙂🇱🇰😍

[@waterlikebahamas]

Who is that?

[@elitegamer4705]

@@waterlikebahamas Our chemistry teacher🥰

[@waterlikebahamas]

@@elitegamer4705 ia?

[@achepy6352]

You're BM is so loud and please put the materials and apparatus used in the description

[@manansuhail8693]

Manan Suhail 1 second ago the initial value of DO can be calculated by this method but can we calculate final DO by this method? if yes then how?. I have read that final DO is find by placing the sample in an incubator for 5 days

[@mritunjaykumar3954]

Thats a method for calculating BOD(Biological lxygen demand)

[@7sasaaal_zadjali636]

What factors affect amount of DO in water?

[@cassygilbertson119]

Watch this video with the subtitles on... so funny! =)

[@7sasaaal_zadjali636]

What is Winkler method? How it is better than other methods?

[@sahilaggarwal2004]

Awesome explaination!

[@maitripatel9070]

Thank you so much for this video it really helped in understanding the concepts clearly

[@nagarjunhanchate5609]

Nice explanation friend But in India we use conical flask and burrete

[@7sasaaal_zadjali636]

What is importance of DO?

[@wwewithphenomenal1522]

Subtitles are needed

[@mark515a]

Nicely done presentation; but curious about how your sample came to 14ppm when that is saturation point for fresh water sample at 0C..... didn't look like you were freezing! I understand there are controversies about Winkler method.

[@wagenlowyikhang7019]

just. best subtitle everrrrrrr

[@theoneoutofnazareth]

What happens to the DO results if you add too much Starch Indicator? I was in the field and my dropper was missing from my Starch indicator solution so I had to improvise. I ended up getting a DO that was typical for a stream, but I am just curious if I need to go to the site and resample? Thank you and great video presentation!

[@dr.similadeadeodun3119]

Yes, go back!

[@jaywantdhole]

nice presentation

[@arehchamkas6256]

Watching from November 2021❤️‍🔥❤️‍🔥

[@dr.a.sreenivasulu]

fine and the presentation is good

[@ruthalagovindu4102]

this presentation very nice

[@thulanithosalya]

Thank you so much 😍

[@sunnykumar9184]

Thanks a ton...!!

[@vu3dfq864]

thanks a lot!!

[@minakshi158]

a lot of thanks

[@MrJesspod]

Thank you!!

[@arielvega6344]

Show the sample drip like that? You just added sulfuric acid.. 😮

[@samikshyathapa4515]

Thank you 💌

[@ricknickwild3206]

ascent is not that clear though but good work

[@farzanashamim9994]

awsm..easy to understand

[@ramerramz3167]

Haiii ☺️ can u put subtitles 😁☺️

[@ramerramz3167]

please 🙏☺️😁😁

[@gitartha7]

Thank u Ma'am

[@shahriar3692]

Clearly precised👌 Thanks

[@amitisbuilding]

Loved it

[@villageboy5963]

Good job keep it doing

[@GhoOoda]

thanks!

[@winviez6842]

Vey easy to follow and understand. Thanks a lot

[@noursalameh7199]

kl zag

[@jamiruddin961]

thanks

[@charlesssdavid]

ChemLab HAU, where you at?

[@danialplay]

thank u

[@shubhamrajshristy795]

Love the presentation but frankly speaking you can be a huge distraction in my NO NUT NOVEMBER XDXD

[@VICTORBARREDA]

Que pena que no explique en español

[@entertainyourself6797]

welcome

[@lajoswinkler]

I was wondering why she says "manganate sulphamate" instead of "manganese sulphate"... but then I've remembered she says to use gloves and goggles for this. -_- Typical nervous nelly you don't want in a lab. This method is routinely done and calling for such strict safety is a laughing matter. It's not mercury salts or concentrated nitric acid...

[@roirat04]

Ha, dinosaurs roamed the Earth when this method was used. Nobody else uses this Winkler Method on GLP settings , unless prior calibration for older membrane tech. especially in Commercial Laboratory, It used back in early 1970s to 1980s prior to Ion Specific Ion meters , Dissolved O2 Technology. Good for a learning lesson using classical wet chemical analysis, but not for day to day use.

[@ba1l0rgana]

Amazing! Thank you so much.

[@Jkmthink]

Who is here after Dipro vaia's recommendation

[@sakilahmed5904]

❤️

[@sadiqueahmad6229]

Wrong, 1 ml of Sodium Thiosulphate = 1 mg/l of Dissolved Oxygen

[@SAURABHYADAV-hk1vm]

So cute☺

[@amitisbuilding]

You're gorgeous

[@usphann5307]

Insaan ka bacha ban

[@adityamehra7238]

I hate chemistry , i just don't understand chemical equations.

[@velinkolev2715]

Shite

[@kingrajput6202]

Ok sorry but she looks like Leah gotti 😐....,btw thanks mam

[@feedyourfaith7392]

The person in the back was creepy.🙄

[@08_avinashmeena57]

Wow..she is cute

[@feedyourfaith7392]

Avinash Meena the one in the back not saying anything?

[@vu3dfq864]

it helped me a lot during ma exams tqs alot!!!