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Hello Andrew,
not to worry, that pH value is quite
in order. When you judge the result of a correctly performed pH determination,
you should be aware of that the pH scale is logaritmic. Example:
pH 7 means that the amounts of H3O(
acidic) and OH (hydroxide)ions are the same amounts, that is 10 powered by
- 7 moles per dm3 = 0,0000001 moles/dm3.
If you have pH 6, this means that the
H3O ions are ten times more than the OH ions, H3O= 10 powered by -6 moles/dm3 =
0,000001, and the OH ions are 10 powered by -8 moles/dm3 = 0,00000001
moles/dm3.For pH 2 you have a concentration for the H3O ions of 10 powered by -2
= 0.01 moles/dm3 and the corresponding value for OH is 10 powered by -12 =
0,000000000001 moles/dm3. This means that if a pH determination drops
from pH 1 to pH 2, much more has actually happend than a drop from pH 6 to pH
7.
The reason for pH 6 on biodiesel
could be that there is a content of free fatty acids or other acidic remains in
the biodiesel. Is this right, Bob ?
Jan Warnqvist
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