In fluoride selective electrode?

Last Update: April 20, 2022

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Asked by: Prof. Myrtle Lang II
Score: 5/5 (7 votes)

A fluoride selective electrode is a type of ion selective electrode sensitive to the concentration of the fluoride ion. A common example is the lanthanum fluoride electrode.

What is the principle of ion selective electrode?

Principle of ion-selective electrode (I.S.E.) ... consists of a thin membrane across which only the intended ion can be transported. The transport of ions from a high conc. to a low one through a selective binding with some sites within the membrane creates a potential difference.

Which pH is suitable for a fluoride ion selective electrode?

pH Range: The Fluoride Electrode should be used in the pH range 4-9 to eliminate OH- interference. Time: in solution in less than 4s. When, however, the electrode is removed from one solution and placed in another of different fluoride concentration, it may take up to 30s to equilibrate.

Which of the following is Ion Selective Electrode?

Glass membranes

Chalcogenide glass also has selectivity for double-charged metal ions, such as Pb2+, and Cd2+. The glass membrane has excellent chemical durability and can work in very aggressive media. A very common example of this type of electrode is the pH glass electrode.

Why glass electrode is called an ion-selective electrode?

Glass electrodes are ion-selective electrodes based on the chemical properties of a glass membrane of defined chemical composition. Conduction within the dry glass is due to the cation of lowest charge and is not related to penetration by a substantial amount of cations. ... FIGURE 16.

Introduction: Fluoride Determination by Ion-Selective Electrode

22 related questions found

What is Nernstian response?

Nernstian response : An electrode is said to have a Nernstian response over a given concentration range if a plot of the potential difference (when measured against a reference electrode) versus the logarithm of the ionic activity of a given species in the test solution, is linear with a slope factor which is given by ...

What type of an electrode is F selective electrode?

A fluoride selective electrode is a type of ion selective electrode sensitive to the concentration of the fluoride ion. A common example is the lanthanum fluoride electrode.

How do you make fluoride standard?

5.1 Standard Stock Fluoride Solution.

Weigh and transfer 0.2210 g of sodium fluoride to a 1 liter volumetric flask. Dissolve in distilled water and bring to volume. This solution contains 100 µg of fluoride ion per ml. The solution is stable for one year when stored in a plastic bottle.

How did you calibrate fluoride ion selective electrode?

Calibration is performed by analyzing a series of standards and plotting mV vs. fluoride concentration on semilog paper or by calibrating the ion meter directly in terms of fluoride concentration. fluoride ISE. Again, adding TISAB prevents this interference by buffering the pH.

What are the advantages of ion selective electrode?

ISE has many advantages compared to other techniques, including: It is relatively inexpensive and easy to operate. It has wide concentration measurement range. As it measure the activity, instead of concentration, it is particularly useful in biological/medical application.

Which of the following is not the characteristics of ion selective electrode?

Which of the following is not the characteristic of ion selective electrodes? Explanation: Ion selective electrodes have wide concentration range. It is highly selective to a particular ion. 8.

How do you make an ion selective electrode?

In order to construct an ion-selective electrode, we would add an inner reference solution to the other side of the membrane. This solution would contain a fixed concentration of the ion of interest, Li+ in this example.

What is a common cause of error when using a reference electrode?

Temperature, light, electrolyte concentration and contamination all affect the potential of a reference electrode. These effects are most likely to affect portable references which operate in a variety of environments.

Are electrodes?

An electrode is an electrical conductor that makes contact with the nonmetallic circuit parts of a circuit, such as an electrolyte, semiconductor or vacuum. If in an electrochemical cell, this is also known as an anode or cathode.

What is the Spadns method?

The SPADNS Method for fluoride determination involves the reaction of fluoride with a red zirconium-dye solution. The fluoride combines with part of the zirconium to form a colorless complex, thus bleaching the red color in an amount proportional to the fluoride concentration.

How would you prepare a fluoride standard solution of 10000 ppm?

Draw 1 mL of 10,000 ppm fluoride stock solution and transfer to a 1 liter volumetric flask. 2. Dilute with TISAB II diluted background solution to 1 liter mark. Mix solution well until completely homogeneous.

What is fluoride reagent?

Its salts and minerals are important chemical reagents and industrial chemicals, mainly used in the production of hydrogen fluoride for fluorocarbons. ... Fluoride is the simplest fluorine anion. In terms of charge and size, the fluoride ion resembles the hydroxide ion.

How do you test for fluoride in water?

To perform the test, the user must mix a 4 ml water sample and 1 ml zirconium xylenol orange reagent. The color changes from pink to yellow depends on the fluoride concentration in the sample. By comparing the color produced with the color chart, the fluoride content in the water can be quantified.

What is the value of standard hydrogen electrode?

A Standard Hydrogen Electrode (SHE) is an electrode that scientists use for reference on all half-cell potential reactions. The value of the standard electrode potential is zero, which forms the basis one needs to calculate cell potentials using different electrodes or different concentrations.

What is meant by indicator electrode?

In redox methods an indicator electrode is used to sense the presence or change in concentration of the oxidized and reduced forms of a redox couple. Usually, the indicator electrode is an inert noble metal, such as Pt, and the potential of the cell is measured vs a reference electrode.

What type of membrane does a calcium selective electrode use?

The Vernier Calcium Ion-Selective Electrode has a solid polymer membrane. The membrane is a porous plastic disk, permeable to the ion exchanger, but impermeable to water. It allows the sensing cell to contact the sample solution and separates the internal filling solution from the sample.

What is the EMF of standard hydrogen electrode?

The e.m.f of a cell containing of standard hydrogen electrode and a zinc electrode is found to be 0.74 volt.

Which is the strongest reducing agent in electrochemical series?

At top end of electrochemical series there is lithium which is the strongest reducing agent and at the bottom end of electrochemical series there is fluorine which is the weakest reducing agent or the strongest oxidizing agent.

What is the value of R in Nernst equation?

R is the gas constant = 8.314 J/K Mole. T = absolute temperature, n = number of mole of electron involved, F = 96487 (≈96500) coulomb/mole = charged carried by one mole of electrons.