@@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
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.
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.
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?
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.
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.
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.
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?
+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.
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.
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.
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.
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)
+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
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.
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.
