Electrochemistry is the branch of chemistry that studies the processes involving the transfer of electrons. Wet the tablet with about 1 cm3 of distilled water, grind it gently with the end of a glass rod, add 45. Potentiometry is one of the methods of electroanalytical chemistry. Potentiometry definition of potentiometry by merriamwebster. To do this, two electrodes are used, an indicator electrode the glass electrode and metal ion. Lecture 8 potentiometry, electrode potentiometry and. Sources of error in ionselective electrode potentiometry. Pdf the fabrication of potentiometric membrane sensors and their. The higher the concentration of the titrated substance and the titrant, the longer the steep part of the titration curve and.
Electrodes of the first kind pure metal electrode in direct. Most commonly used electrode in potentiometry tube 515cm long, 0. Loading slideshow in 5 seconds potentiometry powerpoint presentation. These files are pure backup media, and cant be installed without a retail product key. Feb 27, 2017 most commonly used electrode in potentiometry tube 515cm long, 0. It is usually employed to find the concentration of a solute in solution. Herein, thinlayer potentiometry combined with ionexchange membranes as barriers for. Measurements, first and second derivative in a potentiometric titration. The following links point to the official download server officecdn instead of iso format, they come as img images. Potentiometry useful in the detergent industry to study the effect of ca, ba, f on. Put a dentocar tablet into the beaker, weigh it again and calculate the mass of a tablet. If a sensitive indicating instrument is used, very little current is drawn from the source of the unknown voltage.
Potentiometry and ionselective electrodes powerpoint presentation. Scribd is the worlds largest social reading and publishing site. May 20, 2017 the potentiometry to know the valency of metal ions it is most helpful for the determination of instability of complex ions in complexometry the potentimetry helpful for the determination of ca, k, cl ions in the body fluids like blood, plasma, sweat and serum. Potentiometry science method solution titration in which the end point is read from the electrodepotential variations with the concentrations of potential determining ions. A typical set up for potentiometric titrations is given in figure 2. It is a method of analysis in which we determine the concentration of an ion or substance by measuring the potential developed when a sensitive electrode is immersed in the solution of the species to be determined. Reference electrodes a reference is an electrode that has the halfcell potential known, constant, and completely insensitive to the composition of the solution under study. Ppt chapter 23 potentiometry powerpoint presentation. Potentiometry article about potentiometry by the free. Our new crystalgraphics chart and diagram slides for powerpoint is a collection of over impressively designed datadriven chart and editable diagram s guaranteed to impress any audience. Potentiometry is frequently used in one of two modes, namely a directmeasurement mode where electrode potential is measured and used to compute concentration and a titrimetric mode where electrode potential is used to detect the end point in a titration. End point detection many things that have been told about use of indicators in acidbase titration hold also for potentiometric titrations. Potentiometric titrations provide more reliable data than data from titrations that use chemical indicators and are particularly useful with colored or turbid solutions and for detecting the presence of unsuspected species. It can also use as a variable resistor in most of the applications.
Potentiometry and ion selective electrodes xpowerpoint. Potentiometry, daniele naviglio analytical chemistry. In potentiometric measurements, the potential between two electrodes is measured using a high impedance voltmeter. A free powerpoint ppt presentation displayed as a flash slide show on id. One of the most common and earliest applications of potentiometry is ph determination, and titration for the determination of electro active species. Potentiometric titration is a technique similar to direct titration of a redox reaction. Potentiometry 8th lecture ppt download slideplayer. The adobe flash plugin is needed to view this content. Chm 4102 electrochemistryprinciple of potentiometric measurement group 6 siti nor rafidah bt mohd ali jinnah 152025 ong hui jin 152161 norasheila bt mohd saad 152167 nur zalikha bt nasrudin 152843 fatin nurul atiqah bt osman 153319 siti nursyafiqa bt zainul abidin 153933 nurasiqin bt iskandar 154652 chan yun joo 154663 nur syazana bt abdul rahman 154794 nur amiera bt azman 155629. Through development of electrodes that selectively determine target ions, potentiometry in general is replacing many older, most expensive and time consuming method.
Basic principles of potentiometry combining two halfcells two halfredox reactions and measuring the potential difference between them that gives e cell if the potential of one hafcell one half reaction is held constant then the potential of the other half half cell or half reaction will be known and consequently. Aug 14, 2016 for the love of physics walter lewin may 16, 2011 duration. Potentiometry potential is measured under the conditions of no current flow the measured potential is proportional to the concentration of some component of the analyte the potential that develops in the electrochemical cell is the result of the free energy change that would occur if the chemical phenomena were to proceed until the. The img images are not the same as the single image downloads that used. In the most common forms of potentiometry, two different types of electrodes are used. A potentiometer is an instrument for measuring voltage or potential difference by comparison of an unknown voltage with a known reference voltage. The potentiometer is an electric instrument that used to measure the emf electro motive force of a given cell, the internal resistance of a cell. The potential difference is determined by the electrochemical cell which is composed of pair of electrodes namely the indicator electrode and the reference electrode.
Potentiometer construction, working and applications. A pure metal electrode that is in direct equilibrium with its cation in the solution. The basic working principle of this is based on the fact that the fall of the potential across any portion of the wire is directly proportional to the length of the wire, provided wire has uniform crosssectional area and the constant current flowing through it. The ph electrode and potentiometric titrations in this experiment you will investigate the nernstian response of a ph electrode, perform potentiometric titrations, investigate the acidbase properties of the bicarbonate buffer system, and determine the pka values of lhistidine. Potentiometry is one type of electrochemical analysis methods. Ganjali mr, rezapour m, pourjavid mr, haghgoo s 2004f.
These potentiometers are used in huge quantities in the manufacture of electronics equipment that provides a way of. The potential is directly proportional to the concentration of the ions. Potentiometric titration end point detection and indicators. Thinlayer potentiometry for creatinine detection in undiluted. Potentiometry is mainly used to determine the potential or the electromotive force of a sample solution. Lecture 8 potentiometry, electrode potentiometry and ion.
It is this difference between creating ions and setting them free that. The past decade has seen the development and application of a diverse number of membrane electrodes. Potentiometric analysis based on potential measurement of electrochemical cells without any appreciable current the use of electrodes to measure voltages from chemical reactions. The overall cell potential ecell is the sum of the halfcell potentials. This is the method in which the potential between two electrodes is measured while the electric current usually nearly zero between the electrodes is controlled. Nov 30, 2015 a video to summarizeintroduce potentiometry. Winner of the standing ovation award for best powerpoint templates from presentations magazine. To do this, two electrodes are used, an indicator electrode the glass electrode and metal ion indicator electrode and a reference electrode. The potential at the electrode is dependent of the activityconcentration of the ions via nernst relationship. Produced by christopher swagler and emilee welton for che 227 analytical chemistry. Potentiometry definition is the measurement of electromotive forces by means of a potentiometer. Remove this presentation flag as inappropriate i dont like this i like this remember as a favorite. Ppt potentiometry powerpoint presentation, free download. What do we need to conduct a potentiometry experiment.
Shaise jacob faculty pharmaceutical analysis nirmala college of pharmacy muvattupuzha, kerala, india slide 2. Electrochemistry is a part of chemistry, which determines electrochemical properties of substances. The main theory involved in the potentiometry is, when the known potential electrode immersed in the sample solution then the potential is given by nernst equation. For this potentiometric chloride titration cell, check for understanding 11. Since the reference voltage can be produced from an accurately calibrated voltage divider, a potentiometer can provide high precision. Ionselective electrodes determination of the sodium monofluorophosphate content of a toothpaste sample using a fluoride ionselective electrode. Introduction to analytical separations, gas chromatography, high performance liquid chromatography, capillary electrophoresis, electroanalytical chemistry, electrodes and potentiometry, electroanalytical chemisty, mass spectroscopy, nuclear magnetic resonance. Amperometry or coulometry 1 potentiometry well focus on potentiometry. Electrodes and potetiometry minnesota state university. Displaying powerpoint presentation on potentiometry and ionselective electrodes available to view or download. This experiment involves the directmeasurement mode. An instrument used for measuring small differences in electrical potential. An electrical resistor of fixed total resistance between two terminals, but with a third terminal attached to a slider that can make contact at any desired point along the resistance.
Use of a high impedance voltmeter in important, because it ensures that current flow is. Potentiometry together with conducibility, coulometry, electrogravimetry, polarography, amperometry, etc. Indicator electrode copper silver cell fuel cell a potentiometer is an instrument for measuring the potential voltage in a circuit. Potentiometry potentiometry is used to measure electrolytes with ionspecific electrodes. Electrodes are devices with which one can detect the movement and separation of charges occurring at phase boundaries, as well as induce and vary such processes by means of a forced current flow. Theyll give your presentations a professional, memorable appearance the kind of sophisticated look that todays audiences expect.
Potentiometry free download as powerpoint presentation. For the love of physics walter lewin may 16, 2011 duration. View 10 potentiometry from nh 4 at georgia institute of technology. Potentiometry instrument, working, analysis technique. When there is no potential difference between any two nodes there is electric current will flow.
View notes lecture 8 potentiometry, electrode from chem 215 at simon fraser university. Liquid junction potential occurs when two solutions of different concentrations are in contact with each other. And also it is used to compare emfs of different cells. Worlds best powerpoint templates crystalgraphics offers more powerpoint templates than anyone else in the world, with over 4 million to choose from. The protons are free to move and exchange with other ions. Potentiometer construction, working and applications elprocus. With the advent of these sensors, potentiometry has entered a new era of usefulness ranging from fundamental studies of electrode mechanisms and the development of novel membrane materials to the more practical applications of pollution monitoring and clinical analysis. Ppt potentiometry powerpoint presentation free to download id. The potentiometry to know the valency of metal ions it is most helpful for the determination of instability of complex ions in complexometry the potentimetry helpful for the determination of ca, k, cl ions in the body fluids like blood, plasma, sweat and serum. Analytical applications 2 main classes of electroanalytical techniques. Potential measurements of electrochemical cells ion selective methods reference electrode indicator electrode potential measuring device reference electrode indicator electrodes ion specific electrodes potentiometric measurements. Chart and diagram slides for powerpoint beautifully designed chart and diagram s for powerpoint with visually stunning graphics and animation effects.
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