Jones wrote.
>
> [For whatever reason, I am seeing a slight acidity pH below 6]
>
From Nebergall-Schmidt-Holtzclaw; General Chemistry 2nd Edition 1963:
" Water in equilibrium with air contains 0.030 volume per cent of
carbon dioxide. The resulting carbonic acid H2CO3 gives the solution
a hydrogen ion concentration about twenty times that of pure water, or
2 x 10^-6 as compared to 1.0 x 10^-7. The pH of the solution is calculated
as follows:"
pH = - log [H+] = - log (2.0 x 10^-6) = - (log 2.0 + log 10^-6)
= - (0.3 - 6.0) = - (- 5.7) = 5.7
"Thus we see that water in contact with air is acidic, rather than neutral,
due to dissolved carbon dioxide."
Since the 1963 publishing date for this 791 page book, the atmospheric CO2,
NOx , and SO2 has increased, and so has the use of Exhaust Gas Recycle on ICEs,
which could account for the higher current for an operating on-board Joe Cell.
BTW, I just bought this mint condition used 2nd edition copy through
for $10.00 + $5.50 S&H (expedited) because my 1st edition that prepared me for
acing upper-level university courses, way back, wore out, but, I might
have it bronzed along with my ancient Hp 11C calculator, if it ever wears out. :-)
Fred
