Potentiometric pH measurement
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- čas přidán 25. 04. 2013
- The pH-value of a liquid can be calculated using the potentiometric measurement principle. This video shows what it is about and how this measuring principle works.
www.products.endress.com/ph - Věda a technologie
I am a RO plant operator and I found this video very helpful, thanks!
This was exactly what I was looking for! Thanks!!
This is a fantastic video, thank you
so nice of you to make such videos
I really appreciate
1 hour lecture explained in 5 min, GG youtube
Yes, teachers are regularly awful at teaching this in class
I agree (I don't speak english very well, but this video was usefull..)
GG industry professionals who made the video.
@@leonardotroya2084 ٠
ًهح
1جج
#الوتر ٩٠٠ ٨ ١١
Great video. Clear and straight to the point, with a good array of visuals. Thank you!
Awesome video on the principles of pH sensors!
Would you be able to briefly explain the stirring effect and why it affects the pH measurement? And also if there is a way to measure the pH or ion concentration (using ion selective electrodes) of flowing liquids?
U made this so easier for me to understand ...thank you
Excellent video!
Really helpful
Thx god. Finally find such animation. No confusion anymore!!
Thank you very much! This video is amazing, I love it
superb explanation!thanks!want to see more
Its osum ....I understood everything ,thank you for providing such videos
Nice elaboration of pH electrode and its working.Thanks from Pakistan.
This video has been of great help to me. Thank you.
Mansi Gupta where ‘re you from, Mansi. I ‘m Charlie come from Viet An Enviro, representative of EH in Vietnam. Welcome to support you about EH products
Mansi Gupta 2
Wow ! Great explanation.
Thank you so much.
Great and very helpful, thank you.
Thank you for the great video
I found all the information I wanted.Thanks you.
Simple but detailed explanation of the principle.
This video is fantastic, thanks a ton!
Sir thank you very much for this video.We are using ph analyzer in a power plant in Saudi arabia.All of made of Endress Hauser......Sir very grate invention.I am proud on you.
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Excellent video. Superb !!
nice explanation..thank you
Thanks a ton...great explanation
Really nice explanation...
What a wonderful explanation with clarity! keep it up.
Following
wow perfect vid! explained very well!
A great video, thanks!
This is a fantastic video, thank you.
Jeannette Socorro Cruz hi
Hi
Well-made and illustrated video
awesome video. Thankyou!
Thanks very much because I was looking for this
i love you for this, many many thanks!
Awesome! Thank you!
Very helpful. Thanks!!
Fantastic explanation
So which me provides more reliable results and which one is faster and lasts longer ?
Bahuut achcha sir👍
@spiritu sancti - if the acid is dissolved in water, then the pH/acidity of that solution can indeed be measured by a pH meter
Great video. Thanks.
is it okay to store the probe in ph 7 calibration solution since the probe is filled with Kcl buffered at ph 7?
I wish I could have an ISFET electrode in my lab. Thanks for the vid !
Excellent video
thank you for the info 😊😊😊
Thanks for this amazing vid
Thank you for this video. Really helped me in my lesson preparation. :)
Woooooooow very helpful thanks 🙏
fantastic video
really its great......
Best explained
This was brilliant
I'm really thanksfull (I', learning write and speak english), I had see thw video several times..but ist I'm looking for, I read many text in spanish, and didn't understand, always the same cuestion..but how the solution provoque a difference potential???.. Until I saw this video..Tanks x1000 from Ecuador.
Como es el tipo de conexionado en el analizador podrian explicarme
Grat explain
Wow fantastic.....👍🏻
thank you
Excellent ...
Great video, but didn't quite understand the animation of the junction. If the junction should "protect the reference system from the medium measures" then I guessed that it would chemically isolate the reference system but the animation was to the country. Until I found this explanation, which you might also find helpful:
"The reference junction, also known as a diaphragm, creates electrical contact between the reference system and the solution. Much like the reference electrolyte, the reference junction must possess certain qualities.
Diffusion voltages at the junction are a common measurement error, so the junction plays a major role in the precision of measurements. To keep these disruptive potentials small, the junction must guarantee a relatively large and consistent outflow of reference electrolyte. However, the junction must only be slightly permeable to prevent electrolyte from escaping too quickly, which is especially important with electrodes utilizing liquid electrolyte. Different junction types have different outflow rates of electrolyte.
In addition to the permeability of the junction, its electrical resistance should be as low as possible and it must be chemically inert."
Good observation, you are absolutely correct. The junction does not isolate the reference cell completely from the other medium, but it will limit the leaking of electrolyte into the medium. This is necessary to ensure an electrical connection. The sensor shown in this video has a PTFE ring-diaphragm, but for different applications other options are also available. Other options are for example 1 or 3 ceramic junctions witch are smaller and have a smaller pore size, this will have a lower outflow of KCl. Or for some applications an open junction is used, this will be basically just a hole on the side of the sensor. That the KCl will not flow out immediately, the KCl is here solved in a gel. As our last example for your question, if measured in deionized water the KCl can deplete faster, then a KCl storage vessel is connected to the sensor to keep the reference filled.
What kind of software do you use to make the animation? Thanks
For further information regarding the production of this animation, please contact our external movie producer Dipl. Des. B. Terstegge (terstegge@email.de)
Thank You
good job!
good explanation but emf is taken by flow of electrons or the proton
which direction
ac or DC
Beautiful
describe resonant frequency type transmitter
great 👍👍👍
Where from the hydrogen ions inside the membrane of the glass electrode I thought it was a potassium chloride solution inside the glass??please help
The hydrogen ions inside comes from the special layer on the glass.
Great
Amazing
Nice... But what is the source of H+ ions at inner side
The source of H+ ions is the buffer solution (potassium chloride) mol 3 , ph neutral
Good video
Nice video
Great ✌
such an amazing vedio thank you so much sir
We're glad you liked it!
this. made. so. much. sense.
Why should Bubble (KCL 3 / Mol ) should be stored at the end of the electrode in a solution?
While all components of has been working electrode into the solution.
Because of the KCl concentration in the reference half-cell is 3M KCl the sensor has to be stored in a 3 M KCl solution. Otherwise the KCl concentration in the reference will change due the diffusion law. If there is a semipermeable membrane between two solution with different concentration of ions, than the liquids are forced by the diffusion law to equal their concentrations. Therefore the ions from the higher concentration will invade the solution with the lower concentration the both liquids are equal. The same will happen to a pH reference cell,
because the junction of the reference cell is a kind of semipermeable membrane. If the sensor is stored in destillated water, e.g., all the KCl moleculs will leave the reference cell to equal the concentration of the
water. That will lead to a decreasing of the KCl concentration in the reference cell and to a change of the redox-potential. And this again will lead to a wrong measurement value. A characteristic sign for a bleeded reference is a shift of the zeropoint
Thanks very much,for the answer and attention you desire.
Hossein Moghadam .
describe or make new videos for resonant sensing element
Wow
Great video!!! But could you add subtitle of this video? I think, it wil understand easier. Thanks a lot!!!
Where i can learn how to storage in the best way or Calibrate this sensor in the best way?
For questions like this please contact our Sales Center near you. They will be glad to answer your request. For contact data please look at www.endress.com/en/contact Thank you in advance!
nice
Nice!
thank you for this
You're very welcome!
Can I use your video in my presentation for academic, education purpose.....
???
@@DrGovindKLohiya no
will this PH analyser getting poor/fails when water pipe line gets empty?
@Hemalsinh Rathod: the sensor in this video is a CPS11D. If this sensor is kept dry, the gel layer at the bulb will get dry as well. This will lead to a deterioration of the measuring performance. This deterioration depends on the time, the sensor is kept dry. If it is only for 15 minutes it wouldn't matter. The measurement is immediately proper. After a few hours the sensor needs a longer time to regenerate and to provide a stable signal. If the sensor is dry for e.g. the whole weekend or longer than it is highly recommended to put it into 3M KCl for 24 hours for regeneration.
Conclusion: The deterioration of the measuring performance depends on the time the sensor is kept dry. The longer the dry-period, the longer the regeneration time. But it is always possible to regenerate it.
Sir how can we determine pka of unknown solution using graph?
I'm confused with equivalent and half equivalent point. I'm not understanding which point we have to select for correct pKa value.
Can you please tell me with reference of any book or anything else.
Thanks 😊
Use the Henderson Hasselbalch equation. A good starting reference is "Chemistry" by C.E. Mortimer.
Cool
The ph value not stable give me any suggestion
Upto what sized cations pH meter works?
The size of the cations doesn't have any impacton a pH sensor because we are talking about a potentiometric measuring system. As long as there are ions in the media (cations and anions) independent of the size, a pH measurement with a sensor is possible.
Endress+Hauser one more thing if pH is based on potentiometeric principle then won't it detect potential difference due to all cations present in soil and not only H+ ions?
The potential difference in the case of pH is only influenced by H+- ions. The reason is the special glass on the measuring part of the sensor, where there is a gel layer on (thickness of 0.0001 mm) which is ion selective, in this case H+. If there is an excess of H+-ions in the media this will "stick" on this layer and the charge will be positive. With lack of H+-ions the charge will be negative.
Why do these explanations of glass electrodes always leave out the role of alkali ions in the glass?
pH measurement is based on the concentration of H+ ions
Soren Sorensen
Correction At 1. 40 it is the HCl (usually 0. 1N) filled on inside of the glass bulb and not neutral kcl
Who made this video ?
This presentation was created in cooperation with an external partner (www.wiegaertner.com). They are working with a software called "Maya". For more information please contact our partner directly.
Wickid! Sören Sörenson....
what a madlad
Why we are using 3M kcl what is special character of this solution
The KCl is an almost ideal electrolyte because the mobility of the K + ion and the Cl- ion is almost equal. Because of that the potential difference in the salt bridge is reduced to a few millivolts or less. ;)
@@larrykpija6026 thank you
@@manikantamaddula4056 👍😁
The advantage of the KCl solution is the good electrical conductivity (thus connected to the drainage electrode), the chemical neutrality and tendentious reaction inertia. Reactions of the membrane glass and the anions of the buffer are suppressed with the presence of the potassium chloride solution, ie with a higher concentration of KCl a decrease of the leaching and thus a reduction of the voltage drift is shown. One uses just a 3 molar solution, since this is an approximately saturated solution. For low temperature applications, 1.5 molar KCl solutions are used as the potential for solution decreases at lower temperatures. Another advantage of KCl is that the ions (K+ and Cl-) have the same migration rate, because otherwise a different diffusion velocity can lead to an interference potential (diffusion potential), ie different concentrations at the phase boundary.
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Your video is mis cut for the voice
3:27 and 3:39
Ph meter works on the principle