Dissolved Oxygen Estimation by Winkler's method Experiment
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- เผยแพร่เมื่อ 25 ส.ค. 2024
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X: / thomastktung In this video, i describe in detail both theoretical and practical aspects of estimating the dissolved oxygen content of a water sample. I cover in detail the Alsterberg Modified Winkler's (Azide) Method for DO estimation. I also touch briefly on the the Rideal-Stewart Modified Winkler's (Permanganate) Method.
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For this experiment this video is the best one on youtube by far. Presentation, mechanism, detailing everything is explained in a very lucid manner. Sir, I just can't thank you enough for how much this video helped me & a lot others. 🙏🙏🙏 (From India)
You are lucidly right there.
Superb. Sir you explained in detail. I didn't get like this in other videos. Thank you so much sir.
Sir really really awesome explanation.. u spent your time with us with a clear explanation.. no matter how much time has gone.. my time in this video values.. tomorrow I have my semester practical.. bless me sir ❤
The video helped a lot with my chemistry IA. It was explained really clearly.
Hello! Currently I'm also writing my IA on this topic, has yours been marked? Is there any tips you could give me? It would be awesome if you could
@@dilanazozturk5248 Glad to see a fellow chem student in the same boat. I just finished my draft IA and am still awaiting feedback/marking. But I could use advice just as much as you.😅😅
YO im also doing my IA on this, can you send me the sources you used for data comparison ? if so that would help a lot
Thank you. I use this method to find the water quality. just learning from this as what is actually happening when those reagents are added to water.
Well explained. Thanks
Sir accorinf to C=n/V the sodium this pulsate solution was 0.0196N not 0.0125N
i love this video so muchhhhhh!!!!!!!!!!! Hurrrayyyyy
Excellent explanation
Wonderful
Loved it💥✨ great work
Sir, you said that manganic hydroxide is formed after the first reaction, but it is manganic oxide in the equation. which one is correct?
The oxide originally formed is directly in contact with aqueous medium , which directly converts it to Hydroxide (oxide + water = Hydroxide)
@@TheSingtangpaScienceGuy thank you sir
@@TheSingtangpaScienceGuy so, sir the brown ppt is manganic oxide or manganic hydroxide?
What is (0.0125N) sodium thiosulphate in molarity?
PLEASE
It is the same as molarity
Thank you so much
Thank you for giving vedio sir once can ask you what are nutrients of bod like fecl3 and cacl2 and phaspte buffer solution. How we prepared and add in the bod determination method. Plz explain it than you
each and every step is very well explained.....if possible please also make video on COD
Thankyou. That was my plan. To do COD and BOD as well. But both these experiments require very expensive equipmemts like COD digestor, BOD incubator etc. So i will not be able to make a video on them as of now. My home laboratory is self funded. Not using some college or university lab 🤷🏽♂️
very nicely explained. thanks
Please explain the Calculation part with formula
Thank you sir, well explained
Wowo nice explanation and learned a lot
Ok sir
I have followed all your instructions. Yellow ppt is forming and dissolves after the addition of sulphuric acid. But there is no result in titration. No straw yellow colour nor violet colour. My water sample is industrial sewage.
I have a same problem my sample is from contaminated stream
Thank you sir
Tq so much sir
Take sodium iodide or potassium iodide with sodium hydroxide to make alkaline azide
why for standardisation, a lot of water is added or diluted to 400 ml
What reference source you used for this video?
can this method be used for supersaturated solutions of dissolved oxygen or need any modifications?
Can you make a conclusion for this?
Can I use potatoes' starch?
Offcourse
@@TheSingtangpaScienceGuy when i add soluble starch solution to my sample the dark blue cplour does not occur. i wonder what is it that am doing wrong
Can you explain why water is added to 400 ml in standardisation?
thank u sir
But I have an a small dought, how to calculate do,
When burret reading is =13.3
How to calculate please send me the final answer ,
The normality of sodium thiosulfate is=0.025
Good sir
What is the analyte
what is the final product of all the three (3) reactions in stoichiometric equation?
I also wish that final net ionic equation was included. We can do it as well if we just combine the three equations and cancel out the "like" groups.
Well explained Sir
what's role of MnSo4 and Alkaline iodine azide in DO analysis.
Please Do reply Sir?
To avoid the Nitrite interference
thank you for the explanation sir. I have a question sir. why in DO formula, Normal & Volume Na thiosufat times 8000? what 8000 mean? I'm sorry if my english is bad.
I am confused too about the 8000
good evening. Can you write sir a separate chemical reaction of manganese sulfate + water and alkali-iodide reagent with the solution gained from manganese sulfate and water? Thank youuu
I badly need separate chemical equation for educational purposes. Hope you'll read this po. Thank you, sir.
Such hard task
Sir, if blue color does not appear in the analysis, what is the meaning of this
Blue colour should appear. If not, there must be something wrong with the experiment. Prepare fresh starch solution. Repeat.
If you did not even get blue color after making head starch, then what to do
May i know the source of your water sample? Could be due to extremely low O2 in the sample
Sir, its chemical preparation is not like any affair
Maina Chemical Complex has done your method.
Great work. 👍
Help me with one querry. From where did you purchased the BOD bottle?
Kindly provide me the link*
*If you purchased online
Thank you 🙂
I bought offline. Its Borosil Brand 300ml capacity. Bit costly.
U can also use 125ml for small scale experiment. Saves u money.
Yup you're right. Borosil laboratory glasswares are a bit costly. In our college we are using 250 mL reagent bottles with glass stopper for the estimation of DO2 experiment. Works fine but I wanted to show the original BOD bottle to the students live.
@@durbadalgoswami when u used 250 ml reagent bottles, i hope u adjusted the volume of water sample to be pipetted out along with the volume of the reagents to be used accordingly. Otherwise it wud be wrong. Of course, for namesake practical classes, where the main aim is just to give the students an idea of how the process goes, any bottle wont be a problem. But BOD bottles are specially designed with special features for DO and BOD estimation, as i've briefly explained in the video. 300ml is the standard volume. 125ml is the small scale lab volume. Quantities of reagents and samples taken to be adjusted accordingly depending on which bottle capacity taken. If u r in the city, then u have the freedom of choice to buy cheaper alternatives that still does the intended function. U can go for generic borosilicate BOD bottles manufactured by some local brand and sold at much cheaper price than borosil or schott duran etc. Wishing u Good luck 👍🏾