Gram-equivalent weight and normality

Instead of moles for mass and molarity for concentration, gram-equivalent weight (or equiv.) and normality are sometimes used in considering redox reactions. The equiv. is the amount of a substance associated with 1 mole of electrons in a redox half-reaction. For example, in the half-reaction (6.16), 1 mole of Zn(s) and 1 mole of Zn- (aq) are associated with 2 moles of electrons. Therefore, 1/2 mole of Zn(s) 

The normality (N) of a solution is the number of gram-equivalent weights of solute in 1 L of the solution. 

Exercise 6.10. A certain quantity of electricity liberates 0.72 g of silver in an electrochemical cell containing a silver solution. If this same quantity of electricity deposits 0.44 g of gold when it passes through a gold solution, what is the oxidation state of the silver in 

1 equiv. of silver 108 Similarly, if the oxidation state of the gold is m 

Answer, interpret, or explain the following in light of the principles presented in this chapter. 

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