Titration (using phenolphthalein)

Рет қаралды 1,594,204

13 жыл бұрын

*** 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)

Пікірлер: 404

@scidemos 11 жыл бұрын

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! :)

@naomielfalan5747 7 жыл бұрын

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!

@sazgarmuhammad8364 2 жыл бұрын

Now l'm 12th grade student studying Titration , Tomorow l have Chimistry Exam , this video was helpfull to understand that , Thanks

@bestnoobs4ever464 5 жыл бұрын

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 ;)

@anonymousjoe291 6 жыл бұрын

Man science Xperiments is savage!!!😂😂 but thanks for the help. You have my appreciation

@chartchasers1 3 жыл бұрын

Only watching this in 2021…bless up, i enjoyed watching this so much and the music just does it for me.

@jeanbooysen3845 11 жыл бұрын

Great video as a quick guide. Exactly what I needed. Thanks.

@mwilamike4496 5 жыл бұрын

Thank you for helping us with my brother,now every thing is perfect....

@harkritjassal8335 10 жыл бұрын

very helpful !! i have my exam tommorow, wouldnt be passing without this video thanks loads!!!

@scidemos 9 жыл бұрын

@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.

@livelife1823 8 жыл бұрын

+Science Xperiments | sXp I love you

@scidemos 8 жыл бұрын

+live life aww, you'll make me blush ;)

@sunitakumari-sr2gf 7 жыл бұрын

Science Xperiments | sXp thank you for the calculation it really helped alot

@icetouch77 8 жыл бұрын

you dropped the base too hard

@scidemos 8 жыл бұрын

That's what it's all about! No room for treble ;)

@shabanamoona3231 6 жыл бұрын

Lmfao

@ujjwalrawat5105 6 жыл бұрын

You made my day :)

@ravikumawat7006 5 жыл бұрын

Its should pale pink not dark pink so its wrong experiment

@bharwabhindi3786 3 жыл бұрын

😂

@amirali-cw1ky 5 жыл бұрын

thank u so much for conceiving such a wise concept of titration.

@isteaqahmed957 8 жыл бұрын

i was about to sleep with the tune of the music but nice project !!!! :)

@Cafe11A 3 жыл бұрын

Yesss!!

@mariamhashim9283 3 жыл бұрын

Lol

@LaXayGaming 3 жыл бұрын

😂😂

@alekhya_c22 2 жыл бұрын

🤣🤣

@scidemos 12 жыл бұрын

@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 :)

@scidemos 11 жыл бұрын

It's by my favourite guitar player, Joe Satriani. The song is called 'A piece of liquid'.

@kastro4460 7 жыл бұрын

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)

@jyotisharma9451 6 жыл бұрын

Kastro44 Jyoti

@scidemos 12 жыл бұрын

@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.

@scidemos 12 жыл бұрын

@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 KZfaq that contain the required accuracy you desire :)

@abhilashsbharadwaj8630 5 жыл бұрын

Thank you sir because of you I got good marks in titration 🙏🙏🙏

@scidemos 12 жыл бұрын

@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.

@ritenchaudhari397 2 жыл бұрын

Thank You man I seriously needed that

@scidemos 12 жыл бұрын

@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.

@arctiem 9 жыл бұрын

Thank you so much bro! I have my chem practical tomorrow and you helped me out a lot!

@Indiantubeer 6 жыл бұрын

Rahul Gupta mine is today🙂🙂

@daniyalhussain4909 5 жыл бұрын

Mine is today

@JohanLiebert47 5 жыл бұрын

Same lol

@valanali376 5 жыл бұрын

Tomorrow 👍🏻

@NileshKumar-sq1eb 4 жыл бұрын

I have tomorrow

@shivshankarchaudhary9644 5 жыл бұрын

This experiment clarify more clearly that a lecture.

@scidemos 12 жыл бұрын

@MrTon43 Yes it is slow doing it this way but it's generally the way it's done in schools.

@scidemos 11 жыл бұрын

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.

@mmeste5218 2 жыл бұрын

song goes hard at 2x speed

@youshaahmed88 Ай бұрын

Bruh I was here to study not vibe 😆😂

@elenalouis311 11 жыл бұрын

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! ^^

@ssr4181 8 жыл бұрын

thanks! tomorrow is my Titration experiment :)

@ammarfaruqui6258 7 жыл бұрын

Fire Man same here

@LJ-ml7oz 6 жыл бұрын

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

@samcrossley173 9 жыл бұрын

Hi, why didnt u use universal indicator or methyl orange? what made u pick phenolphthalein? cheers

@itsthandok 9 жыл бұрын

Thank you soo much, this helped me understand a whole lot better!

@scidemos 12 жыл бұрын

@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.

@SuperAbdu2010 9 жыл бұрын

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'?

@DrDeepakSharmaChemistry 3 жыл бұрын

For more Chemisty practicals please watch the following playlist link kzfaq.info/sun/PLThAifIv_dv6DrohJPL-Nys2aeRrv-TUi

@samadritatalapatra8475 4 жыл бұрын

Thanks a lot. Hv my exams tomorrow. Will be of a gr8 help

@myvideosfortheworld6122 8 жыл бұрын

Thanks A Lot ....... Nice Demonstration ! You Rock !

@scidemos 8 жыл бұрын

🤘🏼

@scidemos 12 жыл бұрын

@Anonymous2094 Phenolphthalein indicator is colourless in acid and pink in alkali (between pH 8.3 to 10)

@scidemos 11 жыл бұрын

You're correct - I've replied to several comments mentioning this and it's been added to the video description...reading before posting FTW ;)

@yashwanthhariharan6624 9 жыл бұрын

where will i get the observation tabular column

@rababshami9567 4 жыл бұрын

How we add Naoh from the buret ? After each drop we should close the buret or how?

@kirankumarp9103 6 жыл бұрын

Tnqs very much,,, for this video because I not attend the post chemistry lab of titration,,, by this video u r helped me

@malv4935 8 жыл бұрын

Thanks! Lovely video and lovely background music :D

@scidemos 8 жыл бұрын

Thank you for the positive comment :)

@samikshakohad6344 7 жыл бұрын

Ty it helps me a loy it is like a revision for us

@pareekshitvaid4605 8 жыл бұрын

why time lag between two titrations in NaOH -vinegar titration should be less?

@beatbusters2914 5 жыл бұрын

What is the alternative for phenolphthalien indicator...?

@idtelc3308 7 жыл бұрын

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.

@scidemos 7 жыл бұрын

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 :)

@shadabali4940 5 жыл бұрын

Thank you sir tomorrow is my practical and colour is pale pink

@ashrafa.swarieh1604 4 жыл бұрын

V. Nice vedio. Would I use the vedio as an educational tool for my students.

@starlight0208 12 жыл бұрын

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 :)

@mansipuri6437 8 жыл бұрын

now i am ready to perform my experiment 😊😇 thank u 😇😇😇😇

@AB6media Жыл бұрын

@Vaidh Saurav me also bsc student 1 st year ...

@scidemos 12 жыл бұрын

@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.

@alalalvita1863 6 жыл бұрын

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

@sakshikuchankar9233 6 жыл бұрын

thanks it's wonderful

@exploreanything20yearsago95 6 жыл бұрын

Sir, how much drops of phenophthelin we should mix with NaOH

@indrasai5411 5 жыл бұрын

Is it change its color after neutralization also?

@PKTN88 12 жыл бұрын

please i need your help which needs more volume of NaOH to increase its pH the strong acid like H2SO4 or the weaker one CH3COOH??? thanks in advance

@duaat.mohammad3961 9 жыл бұрын

Wow! i understand it better now..!

@isharasewmini1231 7 жыл бұрын

super.. wish your all the best!

@Reaperdoctor 12 жыл бұрын

@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. :)

@sammrayounas2681 3 жыл бұрын

Which solution take in burette or which take in titration flask???

@juniormasiya3706 9 жыл бұрын

I don't think the solution was titrated at " 25.5cm^3 , if you watch closely after the last drop the solution appears to be losing colour , i am sure he had swirled it once more the pink would have totally disappeared. But I understand that this is meant as a demonstration not for precision.

@gdshinely4560 11 жыл бұрын

Can I ask, How many drops do we put in the indicator to give the best result? is it 3 or more?

@sarthakkeshari3807 4 жыл бұрын

Heyy i want to ask that where to use oxalic acid and phenolpthalein

@sophiacuffy3057 11 жыл бұрын

this sure helped me to understand

@masdarec7158 8 жыл бұрын

THANK YOU !!

@henriqueclarke754 4 жыл бұрын

I want to know what the initial burette reading was

@producedby_jett 2 жыл бұрын

This vid definitely helped but can I know the song name of this also?

@whizzkid11k 12 жыл бұрын

@scidemos You're going to erode the burette quicker if you have the alkali solution in the burette instead of the flask though. Alkali and glass don't mix and it's cheaper to replace a flask.

@tavleen6129 10 жыл бұрын

wow! thanks for the quick revision! :D

@fional1212 12 жыл бұрын

Thanks so much! this really helped

@savagegamer8226 7 жыл бұрын

thanks a lot for the video

@arielpatterson1462 9 жыл бұрын

what's the concentration of the HCl? is it 0.1 M?

@dr.alimohammed5086 3 жыл бұрын

Q/explain in detail the neutralization curve between the reaction of a strong acid and a strong base ?

@yuanhuilee3082 9 жыл бұрын

Lol i thought we're supposed to put the acid into the burette, the base in the conical flask? Or are they the same

@prakharsrivastava5054 2 жыл бұрын

Thank you so much

@nirujaanton494 8 жыл бұрын

it's very useful to every science students.thanxx sir

@ashishdange3988 5 жыл бұрын

Nice one

@mattmarkarian8820 7 жыл бұрын

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

@sarahsweetlove2252 9 жыл бұрын

Wait so is it supposed to go colourless or should there still be some colour and that's when you record final reading??

@avizenoi 11 жыл бұрын

I like the background music :) Which one is it ?

@jrmora71 11 жыл бұрын

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).

@wariric 11 жыл бұрын

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.

@Driffoid 9 жыл бұрын

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.

@scidemos 9 жыл бұрын

Driffoid Yep, that's correct and I've stated about the lack of accuracy in the video description which you must have missed.

@shivaneri2294 5 жыл бұрын

Splendid sir

@scidemos 11 жыл бұрын

Glad the video was helpful! Joe Satriani is a great guitarist and musician - glad you liked the music too :)

@ignited_beast8113 3 жыл бұрын

8 years ago.....woah

@Anonymous-xh4hs 2 жыл бұрын

@@ignited_beast8113 ikr damn...

@Anonymous2094 12 жыл бұрын

Excuse me, would you explain why the color pink is obvious at the beginning of dropping but then by shaking the flask it disappears?? I mean why does it take to shake the flask few times before the pink color remains??

@moinrawani8447 7 жыл бұрын

i have my practical exam tomorrow , this video helped me revising the practical .thnks gr8 job . do u also make videos of phy experiments ? :)

@kurdtpage 9 жыл бұрын

Does anyone know the concentration of the Phenolphthalein? Is it a 1% solution?

@abhijeetsutradhar5661 2 жыл бұрын

Amazing

@azharmehmood2227 4 жыл бұрын

Please explain it why pink color disappear

@franciskalarickal4607 6 жыл бұрын

Thank you

@narendradubey9062 6 жыл бұрын

thanks to this video this video help in my practical

@scidemos 6 жыл бұрын

Narendra Dubey you’re very welcome 👍

@sharanpatil5624 7 жыл бұрын

Hey what would happen if you add excess naoh

@muhammadahmed6904 10 жыл бұрын

thankyou so much reallly helpfull

@samadshaikh4201 5 жыл бұрын

Thanks

@Indiantubeer 6 жыл бұрын

thnx..today is my practicle .n m soo weak in it .let see wht happens

@ztqfern 13 жыл бұрын

Thanks so much!!

@sciencethink 6 жыл бұрын

Hey, why don't you upload videos ?? It's been years you haven't uploaded . You have good content and better views . 😊

@mattkishon1 11 жыл бұрын

So can you tell me what was Observed and a Discusion about it?

@Anonymous2094 12 жыл бұрын

@scidemos Thanks a lot for the explanation & for the useful video & for the fast reply as well. :)

@jitumanithakurai1297 6 жыл бұрын

beautiful triple triple music nd good job...thank you sir..

@shwetasharma942 7 жыл бұрын

thanks a lot 😊😊