Titration (using phenolphthalein)
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- čas přidán 3. 03. 2011
- *** For those who have not noticed the previous comments about the accuracy in the video:
This video was made as a quick guide for one of my classes about what a titration is and it wasn't meant to be an exact representation since that would have taken longer and I wanted to get to the end point faster so they could see what happens. I explained to them that it would need to be done more accurately if they were ever to do one themselves. ***
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A titration experiment is used to calculate an unknown concentration of acid (or alkali) using a neutralisation reaction.
In this titration an alkali (with a known concentration) is carefully added to the acid (of unknown concentration) using a burette. The volume of alkali used in the experiment is needed in order to perform a calculation to work out the concentration of the acid.
The acid used in this titration is hydrochloric acid (HCl, 25ml volume, unknown concentration) and the alkali used is sodium hydroxide (NaOH, 0.1M concentration).
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Useful equations to calculate the unknown concentration of acid:
number of moles = concentration x volume
concentration = number of moles ÷ volume
Concentration is measured in moles per litre (moldm-3)
Volume is measured in litres (decimetre cubed: dm3)
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The equation for this reaction is:
hydrochloric acid + sodium hydroxide ---- sodium chloride + water
HCl + NaOH ---- NaCl + H2O
(using subscript for the 2 in H2O)
You're welcome! ...Finally, someone who actually reads the comments to realise it was an approximate method simply to show what a titration is and not to point out to me the same thing many people before them have written! :)
this was EXTREMELY helpful! I'm doing this same exact experiment in my chemistry lab this week and i had no idea what my lab manual is telling me to do, so this helped a lot, thank you!
Man science Xperiments is savage!!!😂😂 but thanks for the help. You have my appreciation
Really nice vid it helped me so much for my lab report I really appreciate the time and effort put into this ,man, you saved me ;)
very helpful !! i have my exam tommorow, wouldnt be passing without this video thanks loads!!!
Great video as a quick guide. Exactly what I needed. Thanks.
Thank you for helping us with my brother,now every thing is perfect....
Thank you so much! We made this on our chemistry class but i didn't understand it well, now i do. Thanks again ;) (P.d: i don't know why the people complain about the music, i think it's ok :v)
Kastro44 Jyoti
Now l'm 12th grade student studying Titration , Tomorow l have Chimistry Exam , this video was helpfull to understand that , Thanks
It's by my favourite guitar player, Joe Satriani. The song is called 'A piece of liquid'.
i was about to sleep with the tune of the music but nice project !!!! :)
Yesss!!
Lol
😂😂
🤣🤣
thank u so much for conceiving such a wise concept of titration.
@fizzy2o11 The video was intended as an intro/overview as to what a titration is so it isn't too accurate. Glad it jogged your memory :)
Only watching this in 2021…bless up, i enjoyed watching this so much and the music just does it for me.
Thank you sir because of you I got good marks in titration 🙏🙏🙏
Thank you so much bro! I have my chem practical tomorrow and you helped me out a lot!
Rahul Gupta mine is today🙂🙂
Mine is today
Same lol
Tomorrow 👍🏻
I have tomorrow
you dropped the base too hard
That's what it's all about! No room for treble ;)
Lmfao
You made my day :)
Its should pale pink not dark pink so its wrong experiment
😂
Really helpful! I have a test tomorrow ab this and you do help a lot. Hope I will do it as half well as you do! ^^
@d3sire100 You are correct about the less-than-accurate drops! This video was made as a quick guide for one of my classes about what a titration is and it wasn't meant to be an exact representation since that would have taken longer and I wanted to get to the end point faster so they could see what happens. I explained to them that it would need to be done more accurately if they were ever to do one themselves. The shade of pink of the phenolphthalein indicator is fine in this experiment.
@MrTon43 Yes it is slow doing it this way but it's generally the way it's done in schools.
@Anonymous2094 The technician I filmed dropped alkali into the flask (containing acid and phenolphthalein indicator). When the alkali drop made contact with the indicator in the flask it caused the indicator to turn pink in response to the alkali hitting it...but once the alkali that was dropped into the flask spread through the rest of the liquid, it made the initial drop of alkali a lower pH (because it was mixing with the acid already in the flask) and so the pink colour turned to colourless.
@JenkinsonTarron You weren't to know of course but this video was aimed at my GCSE class (not A level) and just needed to give an overview of what a titration is. It wasn't intended for the students to accurately replicate a titration themselves. So don't be sad, I'm sure there are plently of titration videos on CZcams that contain the required accuracy you desire :)
@Ariel Patterson
Vol of NaOH: 25.4 cm3 (ml) = 0.0254 dm3 (litres)
#moles NaOH = conc x vol
= 0.1 x 0.0254
= 0.00254
This is a 1:1 ratio of moles, NaOH:HCl so 0.00254 is used for #moles HCl
Conc HCl = #moles ÷ volume
= 0.00254 ÷ 0.025
= 0.1016 M
*I know the experiment would need to be repeated so that the concentration of NaOH is found more accurately but based on this experiment here is the calculation.
+Science Xperiments | sXp I love you
+live life aww, you'll make me blush ;)
Science Xperiments | sXp thank you for the calculation it really helped alot
thanks! tomorrow is my Titration experiment :)
Fire Man same here
You're correct - I've replied to several comments mentioning this and it's been added to the video description...reading before posting FTW ;)
@nalatwad Yes, that way is fine too, you just had it the opposite way around from my video. You had the acid in the burette and the alkali in the flask instead.
You are correct about alkalis and this has been addressed in previous comments. Either way is fine for a titration though as it depends on which one (the acid or the alkali) is the unknown concentration. This decides which one goes into the burette.
THANK YOU !!
wow, very good video!! I can't tell you how often i have done titrations and as i'm adding the base to the acid, i going 'Yep, nope, Yep, nope, Yep, nope' my teachers all laugh at me when i go.....lol :)
Thanks! Lovely video and lovely background music :D
Thank you for the positive comment :)
song goes hard at 2x speed
Bruh I was here to study not vibe 😆😂
Thanks A Lot ....... Nice Demonstration ! You Rock !
🤘🏼
This experiment clarify more clearly that a lecture.
@browngurl185 Phenolphthalein is colorless in acidic solution and turns pink in alkali. The way I did it was to put the acid in the conical flask (and so the phenolphthalein was colourless) and add alkali from the burette which would start to give the pink colour. You mentioned acid twice but if you got the opposite colours with the indicator then you must have had the alkali in the flask and added acid from the burette. You can do it either way around.
Glad the video was helpful! Joe Satriani is a great guitarist and musician - glad you liked the music too :)
8 years ago.....woah
@@ignited_beast8113 ikr damn...
now i am ready to perform my experiment 😊😇
thank u 😇😇😇😇
@Vaidh Saurav me also bsc student 1 st year ...
Thank You man I seriously needed that
Wow! i understand it better now..!
wow! thanks for the quick revision! :D
thanks it's wonderful
Splendid sir
Tnqs very much,,, for this video because I not attend the post chemistry lab of titration,,, by this video u r helped me
Hi. I am currently working with a Professor from the Nanyang Technological University, Singapore and we would like to use this video as part of his video lecture. Would it be possible to write in for permission to use this? We will remove the music so as not to infringe copyright.
Thank you for asking for permission to use the video. Feel free to use it for the lecture. There's no need to write in, your comment is enough. I'm glad my video will be of help to you :)
Thank you sir tomorrow is my practical and colour is pale pink
V. Nice vedio.
Would I use the vedio as an educational tool for my students.
super.. wish your all the best!
thanks for the video, this helps me a lot.I'm going to have this experiment today and i dont need to worry anymore cause i've seen this video hehehe
@Anonymous2094 Phenolphthalein indicator is colourless in acid and pink in alkali (between pH 8.3 to 10)
For more Chemisty practicals please watch the following playlist link
czcams.com/play/PLThAifIv_dv6DrohJPL-Nys2aeRrv-TUi.html
Thanks so much! this really helped
are there any tips to differentiate the "imaginary pink" color from the clear color (cuz i cant really tell until i put 1 drop too many)?or you will just have to tell by experience
thnx..today is my practicle .n m soo weak in it .let see wht happens
Ty it helps me a loy it is like a revision for us
@whizzkid11k True, but it helps to have the alkali in the burette if it has the known concentration and the acid is the unknown concentration.
Thanks
thanks a lot for the video
Thank you for a great video! I just showed it to my 12 y/o daughter as an example of things that might look like 'magic', but that have a perfect scientific explanation. Nice to see people like you trying to educate our World, especially when we are bombarded with so much BS (including religions in general).
Science Xperiments | sXp I have my AS level chemistry ISA experiment tomorrow,do i use the 2 concordant results to get the average titre,or do i add up all of the titre's and divide by 'n'?
Thanks a lot. Hv my exams tomorrow. Will be of a gr8 help
Everything about this video was awesome. Except the music was a little too much during the guitar solo. But still, awesome video. I showed it to my AP Chem class. :-D
[ guitar music intensifies ]
[ demonstrator grows visibly more irritated ]
thanks a lot 😊😊
thankyou so much reallly helpfull
Thanks so much!!
Thanks You for your video.
it's very useful to every science students.thanxx sir
Hi
Nice one
Amazing
Thank you
this sure helped me to understand
beautiful triple triple music nd good job...thank you sir..
Thank you so much
i have my practical exam tomorrow , this video helped me revising the practical .thnks gr8 job . do u also make videos of phy experiments ? :)
U helped me a lot in my practical tnx bro
Hi, why didnt u use universal indicator or methyl orange?
what made u pick phenolphthalein?
cheers
Oh man, Satriani's the best, isnt he? I love Pat Metheny too, and i am supposed to a titration lab soon in my chem class. Thanks for posting this, it gives me a pre-knowledge now of what's gonna happen :D
Good....
Thank you soo much, this helped me understand a whole lot better!
Useful
I like the background music :)
Which one is it ?
Thank you so much you do this lab in simple way🖒🖒🖒🖒🖒🖒
فالح فالح حسن Thank you
When the pink doesn't disappear that means you have created a BASIC solution. You passed the end point. Also the pink is too deep a colour.
Driffoid Yep, that's correct and I've stated about the lack of accuracy in the video description which you must have missed.
Useful video
@paparaziandadnan Plus, it depends on which solution you are trying to calculate the concentration of. You always put the unknown conc. solution in the conical flask, and the known in the burette. This comes from a starting AS level student, so I think this is right. :)
where will i get the observation tabular column
@scidemos Thanks a lot for the explanation & for the useful video & for the fast reply as well. :)
excellent
The bass!
Thank you so much. Tomorrow is my chemistry exam
thanks to this video this video help in my practical
Narendra Dubey you’re very welcome 👍
Thanks =)
very helpful indeed........n i lovd the music aswel.....thnx buddy.....
fine
thanks for showing this. my lab instructions are too technical.
Very nice ❤❤❤
Nice
Hey, why don't you upload videos ?? It's been years you haven't uploaded . You have good content and better views . 😊
Wait so is it supposed to go colourless or should there still be some colour and that's when you record final reading??
@superherosue12345 Glad it helped you :)
To just add to the comment that you agreed to, that the acid should go into the burette. The reason my Chemistry teacher gave 35 years ago was that the caustic soda damages the ground glass surfaces of the tap and so it will eventually seize up, making the burette useless.
Both units are the same so it doesn't matter which is used really. I suppose it comes down to which habit you've acquired over the years and who taught you when you were younger. I use both of the units on different days probably depending on my mood really :)
Very good
How we add Naoh from the buret ? After each drop we should close the buret or how?