Chemistry Reference
In-Depth Information
The amplitude as a function of potential in 0.1 M NH
4
F at pH 4 is shown in Fig. 5.50.
In this solution below 1.5 V and above oscillation is not observed and between
1.5 V and 8 V the amplitude increases with potential reaching a maximum and then
diminishing. The potential range in which oscillation occurs varies with solution
composition.
In HF solutions the frequency of oscillation increases with HF concentra-
122,951,1136
In buffered fluoride solutions, Fig. 5.51 shows that the frequency depends
on pH and NH
4
F concentration.
544
The frequency increases with increasing fluoride con-
centration at a given pH and has a U-shaped dependence on pH for a given fluoride
tion.
