0
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.
Wiki User
∙ 11y ago
Add your answer:
Earn +20 pts
What is glass electrode?
A glass electrode is made of a doped glass membrane and is an electrode which is ion-selective.
Describe construction of glass electrode?
The glass electrode is made in such a way that it is only sensitive to the specific ion.
The principles of pH meter?
When you place the PH electrode in a PH unknown solution you'll find that an electrical potential difference is produced. THIS IS DUE TO: Difference of H+ ion concentration between the test solution and the glass bulb electrode (part of PH electrode that is sensitive to H+ ion concentration) After that the potential difference of the reference electrode (another part of PH electrode) is measured and compared to the potential of the glass bulb electrode by means of a meter. results are read from 0-14 The porous glass of the electrode prevents the H+ ions to diffuse from both sides, but allows the exchange of Na+ ions (contained in the silicates of the glass) with the external solution, for keeping the continuity ot this electrical system. The H+ activity difference between the solution inside the electrode and the external one is measured as electric potential difference, then, converted in pH units (0-14) by the instrument.
Is soda pop in a glass a mechanical mixture solution or suspension?
Its a solution
Is a solution a mixture explain example?
A solution is when two liquids are combined in such as way that they cannot be separated. An example of this would be when liquid chocolate syrup is put into a glass of milk and stirred. The two cannot be separated again. When people say mixture, they do not necessarily mean a solution. They can mean a suspension. This means a solid is reduced to tiny particles that cannot be seen. They are floating in the liquid. One example of a suspension is when you put glitter in a glass of water and shake it. The glitter and water are a mixture, but if you allow it to sit, the glitter will fall out.
What are the advantages of using glass electrode for determining pH of solution?
The advantage of using the glass electrode for determining the PH of a solution is because the glass electrode is very sensitive to any change.
What is glass electrode?
A glass electrode is made of a doped glass membrane and is an electrode which is ion-selective.
Function of pH meter?
A pH meter measures the pH of a solution utilizing a glass electrode and a voltmeter.
What are the Types of ion selective electrodes?
glass electrode, antimony electrode, the hydrogen electrode
Describe construction of glass electrode?
The glass electrode is made in such a way that it is only sensitive to the specific ion.
What type of electrodes use in pH meter?
Examples: glass electrode, combined electrode, platinum electrode
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.
Constructional diagram for glass electrode?
YES
Can the saturated calomel reference electrode be used in strong alkaline media such as 2-5 N KOH solution?
No, Use a Mercury Oxide electrode in alkalai Media. Strong NaOH will damage glass. Available from Koslow Scientific Co.
Why the pH meter is always kept in saturated KOH solution?
KCl is a salt having Ph 7, it is highly ionizable.yet a small leakage of ions from the reference electrode is needed, forming a conducting bridge to the glass electrode. A pH meter must thus not be used in moving liquids of low conductivity. Sushant kumar
Why keep pH glass electrode immersed in water before and after use?
The pH glass electrode is immersed in water because the outer layer of glass become soft (microscopic level). The external layer become hydrated. The cations in the solution are exchanged. This process is called cation exchange method.
The principles of pH meter?
When you place the PH electrode in a PH unknown solution you'll find that an electrical potential difference is produced. THIS IS DUE TO: Difference of H+ ion concentration between the test solution and the glass bulb electrode (part of PH electrode that is sensitive to H+ ion concentration) After that the potential difference of the reference electrode (another part of PH electrode) is measured and compared to the potential of the glass bulb electrode by means of a meter. results are read from 0-14 The porous glass of the electrode prevents the H+ ions to diffuse from both sides, but allows the exchange of Na+ ions (contained in the silicates of the glass) with the external solution, for keeping the continuity ot this electrical system. The H+ activity difference between the solution inside the electrode and the external one is measured as electric potential difference, then, converted in pH units (0-14) by the instrument.
