Junction is used in reference electrode since it allows movement of electrons from reference electrode to solution to glass electrode to complete the circuit.
@@VoiceofMalinki Thank you. But you mentioned the glass bottom only allows passage of positive ion exchange, then it must also allow the passage of negative electrons?
@@zl7650 Yes absolutely. The glass bottom is porous, and it only allows exchange of positive ions. Although electrons are negatively charged, but these are not negative ions, and electrons are very small, so indeed electrons can cross the glass bottom.
@@zl7650 Small ion exchange through the junction of the reference electrode completes the circuit. The glass bottom doesn't allow exchange of ions or electrons, instead it senses the difference in ion concentration of the inner neutral buffer (0.1 M HCl) and the test solution. This difference is recorded by the sensitive electrode as milivolts and reflected in voltmeter as pH. If the solution has more ions than inner buffer it is sensed as acidic and if it has lesser ions, it is sensed as alkaline compared to the inner neutral pH buffer. Hope it helped.
Beta, here no attraction between H+ ions and positively charged ions is going on. What actually happening is, glass electrode has a bulb in bottom, which is specially designed chemically, so that it attracts only positively charged ions. Hence, from both sides (inside bulb and outside bulb) positively charged ions are getting attracted toward the glass bulb. This allows exchange of ions from both sides.
Hi Rahul, actually the glass bottom is specifically designed in a manner so that positive ion exchange takes place through that part only. It is selectively permeable.
The pH meter works on potentiometric principle. As the acidic solution has more positive charge (H+ ion) than alkaline solution, and the acidic solution has greater potential to produce current than alkaline solution.
Thank you, I have one question: what is the purpose of the junction ? Wouldn’t it be easier without it - just keep the KCL in the reference rod?
Junction is used in reference electrode since it allows movement of electrons from reference electrode to solution to glass electrode to complete the circuit.
@@VoiceofMalinki Thank you. But you mentioned the glass bottom only allows passage of positive ion exchange, then it must also allow the passage of negative electrons?
@@zl7650 Yes absolutely. The glass bottom is porous, and it only allows exchange of positive ions. Although electrons are negatively charged, but these are not negative ions, and electrons are very small, so indeed electrons can cross the glass bottom.
@@zl7650 Small ion exchange through the junction of the reference electrode completes the circuit. The glass bottom doesn't allow exchange of ions or electrons, instead it senses the difference in ion concentration of the inner neutral buffer (0.1 M HCl) and the test solution. This difference is recorded by the sensitive electrode as milivolts and reflected in voltmeter as pH. If the solution has more ions than inner buffer it is sensed as acidic and if it has lesser ions, it is sensed as alkaline compared to the inner neutral pH buffer.
Hope it helped.
Mam I have a douby here... Isn't the glass electrode and reference electrode connected to potentiometer? Or is it only connected to voltmeter?
That is an amazing presentation!!!!
Thank you so much
Thank you very much for this quick explanation Ma'am. It was really helpful.
You are welcome
Maam is the reference electrode is the agcl covered silver wire? 🤔
Yes. Although now a days lots of modifications are going on in making different types of pH meter.
mam why positively charged H+ ions attracts positively charged K+ ions ..........................please answer mam
Beta, here no attraction between H+ ions and positively charged ions is going on. What actually happening is, glass electrode has a bulb in bottom, which is specially designed chemically, so that it attracts only positively charged ions. Hence, from both sides (inside bulb and outside bulb) positively charged ions are getting attracted toward the glass bulb. This allows exchange of ions from both sides.
How do exchange of K+ and H+ ions takes place through glass bulb (Min 6:18)?
Hi Rahul, actually the glass bottom is specifically designed in a manner so that positive ion exchange takes place through that part only. It is selectively permeable.
Nice lecture mam 😊👍
@@VoiceofMalinki thanks
@@mohitgupta4801 You are welcome
your explanation is really sweet and your voice is so nice
Thank u so much
Ma'am can reference electrode be made of Hg-Hgcl ? Also can HCl be added instead of KCl inside the glass membrane ?
U need salt bridge but i think HCl will act as strong acid so u can't use HCl as it will have very low pH
modern days glass electrode contain 0.1 m hcl to provide H+ IONS to balance the porous membrane H+ ion equilibrium
Thank you for this mam
Could you please tell me how to make this pH meter at home for exhibition
7:22 what is creating difference in electrical potential?
A Biochemistry student says
Thank you so much ❤❤
Welcome dear
thank you so much! this video is super helpful and detatiled, I understand this fully now
You are welcome
Video is good, but can u do a video of the same topic with calomel electrode
Why is glass electrode used to determine ph? Can we not use s.h.e or calomel electrode to find ph?
Thank you mam for this short and sweet explanation 😇
But mam can you tell the principal on which pH meter works
The pH meter works on potentiometric principle. As the acidic solution has more positive charge (H+ ion) than alkaline solution, and the acidic solution has greater potential to produce current than alkaline solution.
But mam basic solution have only Oh- ions?? How can we measure basic city??
@@jpgnt5721 Basic solution also contains H+ ions, but in less amount. This is the function of pH meter that it measures the amount of H+ ions.
Your lectures are amazing but your speed is little bit slow ,I watch your video at 2x speed 😅
Ok ok
Thank you so much... great explanation ma'am
Welcome dear
But how to sensitive a temperature in same
Pls recommend a cost-effective Ph meter.
Bio-Rad is good
Anyone gmers gandhinagar live
😂
Very well explained.. keep it up
Thank you so much
I liked your way of explanation in a very simple manner.
Thank you dear
Good one..👌
Thank you
Very helpful mam thank you very much
You are welcome
Mam, your voice is nice😊
Thank you dear
Thanks so much Butifual job
You are welcome
Thanks for the gift❤️
Welcome
Amazing explanation
Thank you
Thank you so much mam it's very helpful for me 🙏🌷🙏
You are welcome
Bengali?
Yes 🙂
❤
Can I get a video
You can download this video
Are you from British mam.. Your English is too much like understandable.
Hi dear. I am Indian.
Thanks
Thank u
Welcome
Where the Cl ions
VERY NYCE 👍👍👍
Thank you so much
Good
🤗thank you ....
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😀😀😀 thanks mam
Thank you ❤️❤️❤️❤️❤️
You are welcome
Nice
Thanks
Best explanation
Thank you so much
❤tq
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