Acid-Base Titration Lab

Part of NCSSM CORE collection: This video shows the technique of an acid-base titration. www.dlt.ncssm.edu
Please attribute this work as being created by the North Carolina School of Science and Mathematics. This work is licensed under Creative Commons CC-BY creativecommons...
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[@abi3556]

whos here during covid19?

[@plantlover69]

when your teacher doesn't teach and just directs you to a youtube video

[@trackernivrig]

Exactly what happened to me because of coronavirus.

[@jamesmellismsd2345]

so what’s the answers to this vid cause this bitch slow af

[@saiyajin2k694]

@@trackernivrig same

[@ivansarmiento6659]

word

[@saeedafrimpong3550]

@@NerdyNEET lmao I think they were referring to themselves, in that since they're "slow", they don't know the answer to the question that the lady in the video was asking at the end and wanted someone in the comments to answer for them hahaha

[@TimpBizkit]

NaOH + HCl to NaCl + H2O so you have a 1:1 ratio of molecules reacting. 1.013M*25cc/21.5cc = 1.178 moles/litre to 3dp.

[@nathandoyle6547]

Where are all my fellow quarantine students who have to study at home! XD

[@casper8849]

Heya there 👋

[@marsbear7256]

eyyyyy

[@ethanmcgeough-gamache80]

Heeeeeey

[@isaacmartyn8336]

@ 3:38 and 7:58 the clips show the exact same volume, though the instructor says other measurements.

[@Ammar_H1234]

Yeah I noticed that too. At 3:38, it should've showed the 0 mark on the burette.

[@lambtonchemistry4408]

The final shots of the volume of acid and base are not reported correctly. It must be reported as 25.00 mL of acid as indicated by the presentor early in the video and the burette must always be read to the 1/100 of a mL i.e. a value between the visible graduations.

[@maggiediaz4518]

What was the initial and final reading of NaOH? and what was the volume used of NaOH?

[@Briansampson7852110]

I think the hardest part for me in titration is getting to the endpoint and adding that extra drop that is completely overkill.

[@ferrivillanico7823]

Gloves????? Where are your Gloves????

[@Mojomasonlovin]

I have to do titrations everyday at work. But don't know to much about it. Thanks for the video!

[@victorpius9389]

Hello ma,I love your teaching,the clearity of your voice and teaching,my name is Pius Victor,I am a graduate of chemical engineering from the university of Benin in Nigeria,i will love it if you can be my mentor.i currently teach chemistry in my school were I work and I have raw acids and bases just bought by my school from their manufacturing companies and I need guidance on how to prepare acid and base solutions from them so I can use them for titrations.i will be glad if you will be my mentor ma.

[@Noveleffect]

Excellent presentation! This'll be easy to replicate. Thank you for posting!

[@LeoAugustom]

I'm no chemist and I realize that she is handling possibly low-concentration solution of sodium hydroxide and hydrochloric acid, but shouldn't she be wearing gloves anyway, since NaOH is a strong base and HCl a strong acid?

[@harryaaron9895]

Not necessary. I once ingested a considerable amount of NaOH at low concentration while pipetting by mouth.The pipette had an air bubble in it which collapsed and send the solution shooting up into my mouth. The only discomfort I felt that day was due to me not being able to eat Cheetos without thinking what's in it.

[@PressY2Satisfy]

A strong acid doesn't necessarily mean that it will do more damage to you. Strong just means it completely dissociates in water. Gloves aren't required, although if some acid or base (strong or weak) spills onto your hand, it should be rinsed very well.

[@Adell39]

LeoM She may used a fume ho

[@bhupeshmittal5839]

Harry Aaron even me too

[@LucDeLaat]

Harry Aaron why do you pipette by mouth, isnt that very dangerous.. u can just buy a pipette balloon

[@logerbad19]

Thanks now I'm ready for lab tomorrow!

[@marthorn1]

Yes where are your the gloves. I am a chemical engineer and she should have gloves and a funnel??

[@robustusmaximus9295]

How would she lick her fingers then?

[@gilw1695]

@@robustusmaximus9295 haha nice

[@miftachulfitria4547]

So we must looking for consetration of NaOH? Is the answer 1,1779M?

[@polytopiaislife1255]

Exactly

[@karmakarma9940]

Soo perfect Dr.🌟 thanke you👍🏻

[@hatheetlove_476]

Thank you for the clear explanation:) This will really help me in my college lab

[@maskerid2055]

hatheetlove _ i m doing this in high school.....

[@Aj-me8mo]

@@maskerid2055 congratulations..

[@andy-wt6ok]

Well 1.178 M wasn't very close to 1M was it?

[@jkal1588]

you killed it. well done.

[@davidbehning4477]

1.2M NaOH, 2 sig figs because of the 25 mL

[@njmullins]

The 25 mL came from a volumetric pipette, which is calibrated to deliver to four sig figs, Thus there are 25.00 mL of the acid.

[@bananabeast9384]

its now 1:00am.... bet i stayed up longer than you doing chemistry

[@nataliehernandez2239]

try 4 am lol

[@bananabeast9384]

@@nataliehernandez2239 go to bed pls

[@donodan08]

Does someone have all the results for this I had trouble following along

[@briannabliss1530]

Aight, someone give me the calculation answers

[@trackernivrig]

I know I'm late but I got 1.1779069767441860465116279069767 as the molarity of NaOH.

[@shine-uy5fq]

Use the M1V1=M2V2 equation. (M1)(0.0215L of NaOH) = (1.013M of HCl)(0.025L of HCl) you should get 1.178M of NaOH (The lady said 4 sig figs so I'm just taking an educated guess from there)

[@trackernivrig]

Monokyo Looks right. 10/10

[@lancearyn8656]

@@shine-uy5fq you my friend are a hero.

[@gilw1695]

@@shine-uy5fq carefully; he (or she or they)'s a hero

[@brafiifi]

Please is it advisable to add base to acid? I thought it`s acid to base rather? please educate ?

[@njmullins]

It is usual that base is added to acid. When the acid is delivered, it is termed a "reverse titration". The same stoichiometric information is derived. Traditionally, the burets for acids and bases have different size tips just so that the experimenter is confident of the buret contents.

[@DaFan86]

Phenolphthalein

[@Luvme4ever31459]

One thing I don't understand: how come you can rinse off the burette with water when you want to add just a little bit of hydrochloric acid? Doesn't the water change the concentration of the solution?

[@goten88]

+Christina Basler Yes, but all that matters in the titration is that the amount of acid and base equal out. You can add more water but the ratio of acid to base will still be equal. Hope that answers your question.

[@njmullins]

The moles of acid in the flask are determined entirely by the volume delivered initially (before the water is added). The same is true for the moles of base. The extra water doesn't change any of those values.

[@anna.i2494]

Your voice reminds me of Mathew Mcconaughey. I don't mean that in a offensive way either :) Thanks for the demonstration.

[@KevinQian98]

Amazing video.

[@JerryFrenchJr]

1.178M?

[@lolashenyansky7395]

+Tarek Rezig you need to calculate it by changing the units from ml to liter because the formula works that way.. : C1*V1=C2*V2 so you get a: 0.25*0.013=0.21*C2 C2= 0.0154 M

[@SidKolli]

+jerry french I got the same thing by using algebra to solve for x or, in this case, the molarity of the basic solution.

[@scarlettq81820]

titration is not dilution therefore dilution formula should not be used here

[@kikialeaki1850]

Lola shenyansky because the units are already the same (both are in mL) you don’t have to convert. If it makes you more comfortable to convert, the value wouldn’t change. Your conversion is wrong: 0.025 * 1.013 / 0.0215 = M is the correct equation if you convert to Litres.

[@kikialeaki1850]

zee kay if the mole ratio is 1:1 you can safely use CaVa = CbVb, where a stands for acid and b stands for base.

[@MMA_CAT]

Why do they make us do it 3 times in my class if we are using the same amounts

[@njmullins]

Because your technique may not be consistent. When using a color indicator, the interpretation of the correct color varies, and this corresponds to varying delivered volumes, hence different results.

[@prettybird5818]

Do u put unknown solution in the burette?

[@mohammadabbas3643]

pretty bird No you not! It depends upon the base you use. If the base is weak then you have to fill the burette with the acid and pipette out the base, and if the base is strong you have to do the opposite.

[@chloegerard4930]

Great Content

[@cielomrtnz]

Name of materials please?

[@binzayeduae9639]

PERFECT!!!

[@burathegreat5726]

NaOH is M=1.177

[@timothy_liu]

I got 1.178M, Did Anyone Else Get Something Like This?

[@korbinianhuber2511]

We are working with concentrated HCl in our lab without wearing gloves. A drop from time to time is no big deal and gloves are just not handy at all

[@polytopiaislife1255]

1.178 M of NaOH

[@judyxia5350]

I am wondering what is the device called under the Erlenmeyer flask~

[@wesleyruss778]

A Stir Plate with a stir bar in the Erlenmeyer

[@dewaynebarnes9221]

When you overshoot and make it too pink in your video

[@deet]

lunch prep

[@SamSung-rh2ub]

khela mktabo f denya ou mcha lakhra zrban

[@m-pressnickel1428]

Very Good Video ..(Y) explained well

[@martincarrillo7582]

Did the camera man burp at 1:10? lol

[@kanamechidori]

Thank you :)

[@mraarob3527]

hedwig kuze aniki

[@abdirahmansh.mohamed2031]

this vedoe is better

[@renerodriguez8807]

usefull 4 the test :D

[@ceufrscio707]

4:00 4:38 5:44

[@shlayershiv6015]

thank you

[@funmiadebayo8882]

Don't.Understand. AnythingThisWoman is. Saying

[@hanyroslie4401]

You didn't use glove. It could harm you. You didn't condition the burette with distilled water first and then the base. Contamination could occur. You didn't use a funnel when pouring and this could cause spillage cos we all know we all make mistakes. You didn't read it at eye level and it could lead to parallax error and will affect the expected volume. You didn't swirl it while adding hence it does not guarantee full reaction as it is not homogenous. My conclusion is that this is a horrible and awfully inaccurate experiment.

[@axelnz_]

She had an electric stirer

[@rajeshshahi1000]

You have now idea of amateur chemist a true chemist doesn't act like that looks like you are narcissistic

[@huntersikari]

1,176744186

[@zbynek2733]

ŠEBESTÍK GOT ME HERE