Explore BrainMass

Batteries and Hydrogen

1. The lead acid battery used in cars uses the reaction of
Pb + PbO2 + 2H+ + 2HSO4- ---> 2PbSO4 + 2H2O and has a cell potential of 2.046 volts.
How are 6 volt and 12 volt batteries produced for cars?
a. The pH is made very acidic.
b. 3 or 6 cells are connected together to increase the voltage
c. The concentration of reactants, Pb and PbO2, are increased to push the reaction farther from equilibrium
d. A second reaction is coupled with it.

2. Hydrogen has been touted as a pollution and greenhouse gas free fuel. It can be consumed in a hydrogen-oxygen fuel cell quite efficiently. Which of the following is a weakness of using hydrogen as a fuel? Check all that apply.
a. hydrogen has a zero half-cell potential and does not produce much energy per mole
b. hydrogen is the lightest element
c. hydrogen is a gas and not easy to transport
d. there is too little hydrogen on earth to be of much use.
e. hydrogen is a secondary fuel, meaning it must be created by using another fuel source.

Solution Preview

Please see the attached file.

1)The principle of lead acid battery is Pb is converted to Pb2+ and vice versa in an acid medium
In the experimental set up Pb sheets are dipped in H2SO4 and positive and negative ...

Solution Summary

The solution examines batteries and hydrogen. Pollutants and hydrogen cells are analyzed.