☁️☾✧AS Level Chemistry: Paper 3 (Practical Exam) // 9701/31/O/N/20 // Question 1 - Titration♡☁️
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- Опубликовано: 15 мар 2024
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This is a requested walkthrough of q1 which focuses on titration. We will be solving the calculation questions together. These questions involve finding the mass, molar mass, percentage error and more.
I hope you enjoyed this video! ✩⋰\(^ ▾ ^)/
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0:16 - Intro
0:17 Q1a - Preparation of the salt solution
1:19 Q1b - Rough + Accurate Titre
4:00 Q1c(i) and c(ii) - Calculate number of moles of iodine
5:31 Q1c(iii) - Calculate the number of moles of thiosulfate ions
5:56 Q1c(iii) - moles of hydrated sodium thiosulfate
6:56 Q1c(iv) - Calculate the value of x in Na2S2O3.xH20
8:41 Q1d(i) - Max error of balance
9:13 Q1d(i) - Max percentage error
9:55 Q1d(ii) - Minimum relative formula mass of FA1
10:58 Q1fUsing anhydrous sodium thiosulfate titre value
11:38 Q1e - Dilution of iodine?
12:01 - Outro
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#ASLevel #PracticalExam #Titration
hey my exam is tomorrow and i have a question, do you calculate the volume of FA2 added including the initial bit that was added before the solution turns yellow? or only after the indicator was added \?
Hey! Good luck tomorrow 🥰 They don't specify but it makes sense that the titration starts after the indicator is added because that is when we can indicate that a change will be made. (You can also write that you made an assumption on the exam paper)
@@AskAseel ahh so you'd take the initial volume as what was left after adding the bit into the conical flask? and thankyou 💗
@@glo457 Yup! That’s what I would do☺️. If you have time to ask your teacher to double check that would be good too!
Hey thank you so much for this video. I would like to ask, in this specific paper does the titration start from as soon as we start adding FA2 from the burette or only after the 10 drops of starch indicator? Because I was confused as to why your initial burette reading is 50.00 and not 0.00
Hey! You're very welcome🥰 They don't specify but it makes sense that the titration starts after the indicator is added because that is when we can indicate that a change will be made. Also when filling up a burette, the top will say 50.00 cm3 and at the bottom where the tip/nozzle is, you'll find that it says 0.00 cm3. So when we open the nozzle the liquid pours out and we go from for example 50.00 to 46.00, you'll just do the subtraction.
@@AskAseel Thank you for your reply, I was just confused bcuz the burettes at my school are the opposite the top says 0.00 and the bottom is 50.00😂 but anyways so after I’ve added the 10 drops, would I refill the burette again until the top mark?
@daliaganim9463 OHHH lmaoo 😂 It's the opposite for me whoops. You can refill to be on the safer side, but usually, it shouldn't take more than 25 cm3 to see a colour change. Even if you run out, you can refill the burette and keep note of how much of the solution you used.
@@AskAseel alright sounds good! Thank you aseel💖💖
You're welcome Dalia💖
Hii great video! I just wanted to ask if these type of questions are always in the paper 3 like titration and if they are like yk similar in structure ?? Also can you please do these types of vids for the 2nd and 3rd questions would be really appreciated!
Heyyy Thank you ☺️
Yes these exam papers are very similar in nature! There’s only a couple type of questions they can ask you. I created a break down of it in this video: ruclips.net/video/16QJyrEjh1k/видео.htmlsi=bUzIwjaxA3AWsbyW
And yes I can work on the other questions for this paper 👩🏾💻
@@AskAseel thank you so so much
You’re very welcome 😊
Do you have the pdf of your solved paper or the actual ms of this paper? I cant find the actual ms of this year anywhere.. the ms 2020 ON 31 has completely different answers than it should be
Yes I found it, it’s under the 9701/35/O/N/20
@@AskAseel thanks a lot!
You’re welcome 🥰
thankyou
You’re welcome!
Can u also do bio p3 videos?
I will do my best to make them!
How are you aseel
I wanted to ask if you could be the daughter of uncle sami
Hi Maan!
I’m doing good thank you ☺️ and yes I am his daughter. How are youu?
I'm fine,
I saw the name of your channel so I had a feeling that it may be you, and fortunetly, it was as I expected.
We miss you all so much, you, amjad, ayman,
and israa.
I'm now in the eleventh grade which is my as-level and I got at my o-level 4 a* and 3 a.
I see that your videos are going to be very helpful for me now and I would appreciate if you can be there for me when I need any help.
I hope we meet in the upcoming days and please deliver my greetings to uncle sami
Awww you have grown so much! And we’ve missed you all too!! I will be more than happy to help you out🩷 also congratulations🥳🥳🥳 your grades are soooo good mashallah!