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The hydrogen electrode is not commonly used in pH titrations because it is relatively unstable and requires careful handling to maintain its performance. Additionally, it can be affected by the presence of other ions in the solution, which may lead to inaccurate measurements. More stable and reliable electrodes, like glass electrodes, provide more consistent and direct readings of pH, making them preferable for titration purposes.
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Which electrode is used in pH meter?
A glass electrode is commonly used in a pH meter to measure the pH of a solution. The electrode contains a special glass membrane that responds to changes in hydrogen ion concentration in the solution.
How to measure the pH using hydrogen electrode?
pH = -log [H+] So collect the hydrogen gas in a syringe and measure the volume. Moles of hydrogen can be found using; n = PV / RT Pressure should be 1atm Temperature will be around 293K R is 8.314 * atm/mols V is the reading on the syringe Now that n (of hydrogen gas) is calculated we can find the moles of hydrogen ions using a stoimetric (balanced) equation With that done use; C = n/V V being the volume of the solution that you electrolysed The C is the concentration of H+ ions and now can be subed into the equation; pH = -log [H+] to give pH
Why glass electrode cannot be used for solution of Ph above 9?
This is because of alkaline error above pH of 9. Alkaline Error is a systematic error that occurs when glass electrodes are used to read the pH of an extremely alkaline solution (pH above 9); the electrode responds to sodium ions as though they were hydrogen ions, giving a pH reading that is consistently too low. However it is now possible to purchase [H electrodes made from special glass that can be used above pH 9.
What is the formula to calculate pH slope?
The formula to calculate pH slope is ΔpH/Δlog[H+], where ΔpH is the change in pH and Δlog[H+] is the change in the log concentration of hydrogen ions. This formula is used to determine the sensitivity of a pH electrode.
What is the need for an ammonical buffer solution in the determination of hardness of water by edta titration?
during the complexometric titration using edta it is very necessary to maintain the ph of the solution near about 10 so we use ammonium chloride buffer if we will not use this buffer dring the titration ph of sol. will ho lower side
What is the indicator use in potentiometric titration?
The indicator used in potentiometric titrations is typically a pH electrode. By measuring changes in pH during the titration process, the endpoint of the titration can be determined accurately. The pH electrode provides a continuous measurement of the solution's pH, allowing for a precise determination of the equivalence point.
Which electrode is used in pH meter?
A glass electrode is commonly used in a pH meter to measure the pH of a solution. The electrode contains a special glass membrane that responds to changes in hydrogen ion concentration in the solution.
How does a pH electrode work?
A pH electrode works by measuring the electrical potential difference between a reference electrode and a glass electrode. The glass electrode contains a special membrane that responds to changes in hydrogen ion concentration, which is used to determine the pH of a solution.
What type of electrodes use in pH meter?
pH meters typically use glass electrodes to measure the pH of a solution. These electrodes are sensitive to changes in hydrogen ion concentration and provide accurate pH readings. Additionally, reference electrodes are used in combination with the glass electrode to ensure reliable and consistent measurements.
Ph meter is an electronic instrument with an electrode that is sensitive to the what ions?
The pH meter measures the concentration of hydrogen ions (H+) in an aqueous solution
What type of electrodes are used in potentiometric titration?
Potentiometric titration is a method to detect potential difference between the indicator electrode and reference electrode and thus determine concentration of chemical component, which reacts with reagent added to a solution potentially in equilibrium at the beginning.The popularly used reference electrode is either silver-silver chloride or mercury sulfate electrode, and the indicator electrode is generally made of glass electrode, platinum electrode and silver electrode or ion selective electrode.
How does a pH electrode work to measure the acidity or alkalinity of a solution?
A pH electrode works by measuring the electrical potential difference between a reference electrode and a glass electrode. The glass electrode is sensitive to hydrogen ions in the solution, which determines the acidity or alkalinity. The pH value is calculated based on this potential difference.
How to measure the pH using hydrogen electrode?
pH = -log [H+] So collect the hydrogen gas in a syringe and measure the volume. Moles of hydrogen can be found using; n = PV / RT Pressure should be 1atm Temperature will be around 293K R is 8.314 * atm/mols V is the reading on the syringe Now that n (of hydrogen gas) is calculated we can find the moles of hydrogen ions using a stoimetric (balanced) equation With that done use; C = n/V V being the volume of the solution that you electrolysed The C is the concentration of H+ ions and now can be subed into the equation; pH = -log [H+] to give pH
Explain the theory behind the potentiometric titration of acid base?
In potentiometric titration, the change in the concentration of H+ ions are monitored based on the emf measurement with respect to Saturated calomel electrode ( a reference electrode having a standard reduction potential of 0.2422 V). H+ ions concentration in terms of pH change is measured using primarily by quinhydrone electrode. Based on hydrogen electrode also it can be measured. An electrochemical cell consists of H+ ions (acid to be titrated) in contact with hydrogen gas (1 atm) or quinhydrone/ quinone should be formed and the emf (potential difference) of the cell is measured with reference to saturated calomel electrode (SCE). Then based on Nernst equation value of standard electrode potential of hydrogen ion is, EH = Eo + 0.0591 log [H+] or EH = - 0.0591 pH since Eo = 0 V and -log [H+] = pH So EMF of the cell is Ecell = ESCE - EH Ecell = 0.2422 - EH The Ecell value is plotted ( Y axis) against volume of base added (X axis). The volume corresponds to drastic Ecell change gives equivalence point of the titration. At equivalence point all the free H+ ions are replaced as H2O and this is reflected and can be inferred in the Ecell values.
What are the parts pH meter?
A pH meter typically consists of a probe with a glass electrode, a reference electrode, and a meter that displays the pH value. The glass electrode measures the hydrogen ion concentration in a solution, while the reference electrode provides a stable reference point. The meter then calculates and displays the pH value based on the difference in electrical potential between the two electrodes.
What are the disadvantages of potentiometric titration?
Some disadvantages of potentiometric titration include the need for specialized equipment such as a pH meter or ion-selective electrode, which can be costly. Additionally, it may require a skilled operator to perform the titration accurately and interpret the results correctly. Potentiometric titration can also be slower compared to other titration methods.
How many types of indictors are used in titration?
There are two main types of indicators used in titration: color indicators and pH indicators. Color indicators change color at specific pH ranges to indicate the endpoint of the titration, while pH indicators change color based on the pH of the solution.
