Potentiometric titration using quinhydrone electrode

Check all that is applicable to Quinhydrone

• Bronze coloured needle shaped crystals

• It is highly soluble in water .

• It is equimolar mixture of Quinone and hydroquinone.

• It is used in the determination of pH of the solution

• It is a type of redox electrode

A ___________ wire electrode is immersed in a saturated aqueous solution of quinhydrone and given acid solution.

• Silver

• Copper

• platinum

• Aluminium

What is the Nernst equation for the reaction in the image displayed.

• $E\ cell\ =\ E^0cell\ -\frac{0.059}{2}\ \log\ \left[a\ H^+\right]^2$

• $E\ cell\ =\ E^0cell\ +\frac{0.059}{2}\ \log\ \left[a\ H^+\right]^2$

• $E\ cell\ -\ E^0cell\ =\ \frac{0.059}{2}\ \log\ \left[a\ H^+\right]^{ }$

• $E^0cell\ =\ \frac{0.059}{2}\ \log\ \left[a\ H^+\right]^2$

Name the indicator electrode used in this experiment .

Name the reference electrode used in this experiment.

In the construction of the electrochemical cell, reference electrode is connected to the _____________terminal.

• positive

• negative

The potentiometer is calibrated by checking the potential of the inbuilt standard cell. The potential on the display should be _____________volts

• 1.0183

• 0.989

• 0.2415

• 0. 777

In this experiment Emf of the cell is obtained by the expression, E_cell = __________________

• E_quin- E_SCE

• E_{quin +} E_SCE

• E_SCE - E_quin

• E_{SCE +} E_quin

Electrode potential of Quinhydrone electrode depends on

• Amount of Quinhydrone powder added

• Amount of Quinhydrone powder added

• Concentration of Hydrogen ions in the solution

• the reference electrode used.

The standard electrode potential of quinhydrone electrode is

• 0.242 V

• 0.699V

• 0.771V

• 0.457 V