Potentiometric titrations (Principle, Procedure, Types, Ion-selective electrodes, applications)
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- Опубликовано: 3 июл 2024
- This video describes the principle of potentiometric titrations. It also tells about the different types of potentiometric titrations and suitable electrodes. It describes the procedure for FeSO4 vs K2Cr2O7 redox titration. The different ways of determining the end point or equivalence points using the redox titration curve, first derivative curve and second derivative curve. It lists the advantages, disadvantages and applications of this technique.
Potentiometric titration is a technique similar to direct titration of a redox reaction. It is a useful means of characterizing an acid. No indicator is used; instead the potential is measured across the analyte, typically an electrolyte solution. To do this, two electrodes are used, an indicator electrode (the glass electrode and metal ion indicator electrode) and a reference electrode. Reference electrodes generally used are hydrogen electrodes, calomel electrodes, and silver chloride electrodes. The indicator electrode forms an electrochemical half cell with the interested ions in the test solution. The reference electrode forms the other half cell.
Potentiometric titration is a titration used to measure the amount of an analyte present in the given solution by measuring the change in the potential by a suitable indicator electrode, as a function of volume of titrant.
Potentiometric titration : Types
Redox reaction
Acid-Base (Neutralisation )
Complex formation reaction (Complexation)
Precipitation
Inert electrodes - Redox reaction
When dipped in the analyte solution, it indicates the potential of the bulk solution
Metallic electrode - Pt, Au, Ag etc.
Other conductive electrodes - Graphite, glassy carbon etc.
Nernst equation
Ion-selective electrodes - It responds to the change in the activity or concentration of a particular species in the analyte solution.
Glass electrode - Acid-Base titration - measurement of pH (H+ ions )
Liquid-ion-exchanger electrodes, solid-state ion-selective electrodes, Coated-wire electrodes, Field-effect transistor electrodes
Neutral-carrier ion-selective electrodes - Complexometric titration
Gas-sensing electrodes - used to monitor dissolved gases
Biomembrane electrodes - enzyme catalysis
Redox reaction - Pt, Au, Ag etc.
Acid-Base (Neutralisation) - Glass electrode or Combined glass and reference electrode
Complex formation reaction (Complexation) - Mercury-coated silver electrode, Neutral-carrier ion-selective electrodes
Precipitation - Silver indicating electrodes, ion selective electrodes
Reference Electrode: Calomel electrode
Indicator Electrode: Pt electrode
Analyte solution : FeSO4 (or) Ferrous ammonium sulphate + H2SO4
Titrant : K2Cr2O7
Acid-Base/Neutralisation reaction
Reference Electrode : Calomel electrode or Ag/AgCl electrode
Analyte solution : Acid/Base
Titrant : Base/Acid
Indicator Electrode : Glass electrode
Advantages of Potentiometric titration :
Used for coloured solutions
Suitable for turbid, fluorescent solutions
Suitable for dilute solutions
Uses small quantities of the sample
Special care is not required at the end point, as it is determined graphically- Can obtain sharp and accurate end point.
Does not require indicators.
Disadvantages of Potentiometric titration :
Accurate known concentration of solutions is required.
Labour intensive and time consuming measurements.
Highly pH sensitive.
Applications of Potentiometric titration :
Clinical chemistry - analysis of metals.
Pollutants in water such as metal ions, cyanide, fluorides, ammonia
Agriculture - Determination of various elements in soil, fertilizers etc.
Food processing industries
Detergent manufacturing industries
Other industries such as cosmetic, textile, paper, paint, explosive, energy etc.
After watching your lecture, I could understand the topic of Potentiometric titrations of IGNOU text book [25/07/2023]. Thanks a lot Ma'am.
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thanks mam your explination will be good and i got cleared about potentiometry
This was so clear and detailed. Thank you very much
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I found this video very helpful, thank you.
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Awesome explanation madam thk u so much now I'm fully cleared in this topic ♥️♥️♥️
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everything is very clear and well understood!!.....
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oh my god thank you so much. this was so helpful
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From principle to applications, your video covered all the necessary points. That too, in less than 20 minutes. Great work madam.
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Really, gr8,thank a lot Mam, This is the content I was searching for
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Wonderful video mam thanks ❤🌹😊❤a lot for such informative video
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Super! Thanks you!
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Excellent explanation mam... Thanq
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Thank you so much ☺️
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It's easily understandable explanation ... In this lockdown this is a magical pill for us mam 😍.. thank u mam 🤩👍
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Thank you mam....🌻❤
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Very nice explaination
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Very helpful vedio mam 😊😊
Thank you. Happy that be it helped you
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Helpful 👍👍
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Very good explanation Madam
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Madam, can you please provide here the ppt?
It will be very helpful for us. Thanks.
awesome...mam
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Thanks a lot mam🙏
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May God Bless You
Thank you so much for your heartful blessing.
I wonder I can't find the profile of the lecturer.
Thanks a lot❤
Really helpful
Do make videos like this in future!
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Kindly is ka reference zarori bta dena k kidr sy lia ap nay
Mam please give link to the ppt of potentiomerric and conductometric titrations
Check my blog
Nice explanation. Tan q mam
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Mam can you tell me the reason of increasing potential when we add titrant
In the Nernst equation, the concentration of Fe3+ keeps increasing and the concentration of Fe2+ keeps decreasing till the equivalence point because Fe2+ gets oxidised to Fe3+ with the addition of the titrant. This is why the potential(EMF) increases.
@@RevathiPurushothaman thank you so much aapne kafi ache tarike se btaya ab mer doubt clear ho gye 😊
Name an electrode representation?
Ya kis book sy lia hai any reference??
I have refered many books and resources.
Please tell the cell representation of redox titration
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Already there are many videos in engineering chemistry. Find the videos in this channel.
@@RevathiPurushothaman I need your help
I want to contact you
MATURED LECTURE
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Classic
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Galgotias University students network
Great details. Thank You.I want to buy the potentiometer to analyze the silver content in a solution. Document says I need to have a potentiometer with combination silver electrode or silver chloride coated silver electrode and mercury/mercury sulphate (Hg/Hg2 SO4) electrode or other suitable reference electrode.Can you help to suggest suitable make where I can purchase this instrument set up.Thank You for your guidance.
Wonderful video mam thanks ❤🌹😊❤a lot for such informative video
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