Why is platinum black used in standard hydrogen electrode?

Platinum is an inert catalyst, because it does not engage in the reaction of the cells but provides an oxidation and reduction reaction surface or base. Platinum is used because hydrogen can quickly be adsorbed as well as inert metal does not participate in redox reaction during cell operation.

Why is platinum used in a hydrogen half cell?

Platinum is used because it can easily adsorb hydrogen as well as being inert metal does not participates in redox reaction during working of cell. platinum is a inert electrode,thus it do not participate in the cell reaction but provide a surface or platform for oxidation and reduction reaction.

Why does platinum make a good electrode?

Platinum is used in electrochemical cells because it is resistant to oxidation- it will not easily react, which makes in excellent as an electrode as it will not take part in the Redox reactions occurring in electrochemical cells.

Why the platinum foil is coated with platinum black?

Platinum electrode coated with platinum black because platinization of platinum electrode increases its surface area and which results in superior quality and action of the electrode as compared to normal platinum electrode.

Why platinum wire is used in calomel electrode?

Pt is not normally used in calomel electrode. Platinum is an excellent catalyst for H+ reduction to H2 and H2 oxidation to H+. Therefore the SHE electrode is based off of a platinum electrode for that reaction. Platinum is robust (stable) and highly active, which is why it is used in that electrode.

Why platinum electrode is used in potentiometric titration?

Platinum redox electrodes are used in redox potentiometric titrations. In excess of oxidant oxide films are formed on the platinum electrodes. The potential response of the electrode is distorted, and the film must be removed. Gold redox electrodes are seldom used in potentiometric titrations.

How does a platinum electrode work?

Two platinum electrodes – commonly used in the standard hydrogen electrode. Platinum is an inert metal that is capable of easily absorbing hydrogen. The platinum electrodes do not participate in redox reactions while the cell is working, unlike other metals (such as iron, which can easily oxidize).

Why is platinum used as an anode?

Platinum is used on the surface as a primary anode material due to its excellent corrosion resistance under anodic conditions coupled with its ability to pass current in all electrolytes without forming an insulating film. The corrosion resistance of platinum manifests itself in its low consumption rate.

What is the difference between platinum and platinum black?

Platinum Black is basically very fine powder of Platinum often used in catalysis due to its large surface area as compared to platinum. It doesnt have silvery shiny look like Platinum, but is black in colour, hence the name.

How is platinum used?

A shiny, silvery-white metal as resistant to corrosion as gold. Platinum is used extensively for jewellery. Its main use, however, is in catalytic converters for cars, trucks and buses. Platinum is also used to make optical fibres and LCDs, turbine blades, spark plugs, pacemakers and dental fillings.

What is the role of platinum wire and platinum foil in the hydrogen electrode?

Platinum or gold are used as inert electrodes. They do not participate in the reaction but provide their surface for oxidation or reduction reactions and for the conduction of electrons.

What is the purpose of a potentiometric titration?

Potentiometric titration is a laboratory method to determine the concentration of a given analyte. It is used in the characterization of acids. In this method, there is no use of a chemical indicator. Instead, the electric potential across the substance is measured.

What is a black coating on a platinum electrode?

The platinum electrode that appears with a black coating is coated with “platinum black”. Platinum black is usually deposited electrochemically by reduction of a chloroplatinic acid solution. The reason for using this deposit is that is greatly increases the surface area of the electrode as it is presented to the solution.

Why is platinum used in the standard hydrogen electrode?

Platinum is used in the Standard Hydrogen Electrode due to the following reasons: Platinum is a relatively inert metal which does not corrode easily. Platinum has catalytic qualities which promotes the proton reduction reaction.

Why is platinum used as a reference cell for hydrogen adsorption?

Well, for cell constant, the standard hydrogen elctrode or SHE is used as the reference cell. Here, platinum electrode is used because it acts a catalyst and provides enough surface area for the adsorption of hydrogen molecules.

What is the oxidation and reduction potential of platinum black foil?

In these conditions its standard reduction potential and standard oxidation potential is always zero. This is the reason it can be used as a reference electrode. In standard hydrogen electrodes platinum black foil absorbs or adsorbs hydrogen gas and 1M HCl gives 1M H+ ions. Thus, a redox reaction takes place.