pH Meter | working of glass electrode of pH meter
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- čas přidán 3. 07. 2024
- This is a detailed video on the working of pH meter. It describes how the glass electrode of the pH meter senses concentration of H+ ions in the solution. The potential generated by the glass electrode is compared with the potential of the reference electrode (which generates constant potential). This information is then used to calculate pH of the solution.
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This is the best video I've seen on the principle of pH meters. You simplified it in a good way. subscribed
I Agree 👍
Best video so far in explaining how electrodes work!
Very well made! The concept, the illuatrations, great work!
Explained very well and got some clarity about this topic
The best video about PHmetro. Thank u.
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The best lecture on pH meter ever. Thank you so much.
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This is the best explaination of ph meter that ive seen here on yt by far ! U explained it even better then my teacher;) thanks
Brilliant explanation! This video has explained in detail how potential voltage is produced when there is a difference in the number of H+ ions accumulated outside and inside the glass bulb. Thank you
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This is the best video I've seen for explaining the pH meter..Thank you sir for the lesson.🫡
Really great explanation about ph meter..thankful❤
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Glad it was helpful!
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Thank for your excellent lecture 🙂
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Glad it was helpful!
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VERY GOOD AND DETAILED EXPLANATION, but I have still a problem (at time5: 31) Why is it that if the electrode is enriched with - charges (because it's an acid, and therefore has a low pH), the measured potential is nevertheless greater (and positive) on the graphs?
Is this due to a departure of - charges towards the op-amp input, leaving a positive potential equal to that of the glass electrode? In any case, in the explanation given, between the positioning of the electrons on the central electrode (in the case of an acid), which would suggest that locally the potential at the end of the metal electrode is negative, and the fact that the potential measured at the op-amp input is positive, it seems to me that a step is missing in the description of what happens in the glass electrode. Of course, this is symmetrical in the basic case. How do you go from an electron-enriched electrode (acid case) to an electrode providing a positive input potential to the op amp?
When you say that the H+ from the external solution (to test) makes the inner H+ accumulate to compensate the charge difference, it seems incorrect as what will happen in this case is an accumulation of Cl- because the electric field produced by the H+ ions will repel the inner H+ and attract the Cl-. Can you please explain why then will the inner H+ accumulate on the surface of the glass ?
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I do not understand why the inner H+ ions move to the internal glass surface when the outer solution is acid. Should't they be repelled since they have the same positive charge?
I thought about the same thing, any reason for this?
The H+ are not going outside to inside and they can not go because of the thin glass in between and it results in unequal charge on outside and inside. SO to balance the charge the 0.1M soln. of HCl present in glass gets dissociated and move towards the glass surface leaving chloride ions behind .
@@palak3407 I do not understand the "to balance charge" thing. If the two solutions are completely separated, shouldn't they have indipendent behavior?
Thank you for your query. The thickness of glass membrane is approx 0.1mm which is a huge distance for tiny H+ ions. Hence, they will not repel each other.
@@quickbiochemistrybasics ah allora si
I have a question, Some documents say that the glass electrode side is filled with "pH7 KCl buffer solution" which is different from your information which is "HCl 0.1M" at 1:07 time . Can you help me explain this problem? Thank you very much
Sir what about the OH-ions?
A question. At 4'30", why the number of H+ ions in the inner and outer layers of the glass have to be balanced?
Exactly. why inner hydrogen ions should stuck to the surface of the inner glass because there are more hydrogen ions outside? It doesn't make sense to me
It seems to me the inner H+ should be Cl+, so its the other way around maybe: alkaline acidic
Real good sh*t
How H positive enters into electrode
my question is ........... what is the function of saturated KCL .............??
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Something may be wrong, H+ and H+ repell each other. F e. 4:30
Thank you for your query. The thickness of glass membrane is approx 0.1mm which is a huge distance for tiny H+ ions. Hence, they will not repel each other.
@@quickbiochemistrybasics What i am saying is that at 4:30 INSIDE the electrode its not the H+ ions coming to the glass wall but the CL- ions, that are attracted by the H+ on the other side. otherwise, there is no reason why they should move there, at least I don't see a reason why the H+ should go there in your video. Correct me if I am wrong please. I am not an expert.
@@sa8lviH+ ions from HCl solution moves towards the inner layer of glass to balance the negative charge due to oxygen ions of glass buld.
@@sa8lvi You are not alone. Only makes sense, if there are less H+ ions attached to the inner surface of the membrane, leading to an increased H+ concentration near the inner electrode and therefore a positive potential on the inner electrode. And indeed for ph < 7 the voltage of a pH-electrode is positive (+on the inner electrode an - on the reference electrode). All the sources I have found do not explain the detailed chemistry on the membrane at all or are all over the place. It seems to me nobody apart from some phds understands this properly.
Why the accent
Till before watching this video i had not understood the concept literally mugged up after watched this seriously very catchily registered in my mind 🤍🤍🤍
Well explained
Well explained