electrode potential and cells questions

Question 1

state the meaning of the electrochemical series

Answer 1

list of electrode potentials in numerical order

Question 2

state what must be done to maintain the EMF of this fuel cell when in use

Answer 2

keep concentration of reactants constant

Question 3

state the substances and conditions needed in a standard hydrogen electrode

Answer 3

• 298K temperature and Pt electrode
• conc. of H+ [1.00 mold dm-3]
• 100kPa pressure and H2

Question 4

Describe an experiment the student does to show that the standard electrode potential for the TiO2+/Ti electrode is -0.88v

Answer 4

• weight 8g TiOSO4
• dissolve in sulfuric acid (0.5mol)
• trnasfer ot volumetric flask and make up to the mark
• connect solutions with salt bridge
• need a high resistance voltmeter
• record voltage
• Ecell= Eredox - Eoxi
• copper-titanium = 1.2v

Question 5

why sulfate ions are not capable of oxidising bromide ions

Answer 5

electrode potential for sulphate ions is less than the bromine

Question 6

suggest the major advantage of using the fuel cell

Answer 6

a fuel cell converts more of the available energy from the combustion of hydrogen into kinetic energy of the car