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Appendix 2, pH as a function of mV
The pH-value is the negative logarithm of the hydrogen ion concentration, and it is
directly related to the proportion of hydrogen ions H
+
to hydroxide ions OH
-
in the
media. The pH-electrode measures excess or deficit of the hydrogen ions and gives a
proportional millivolt signal as output. The signal is 59,16 mV per 1 pH at 77 ° F. In
clean water there is a total balance between hydrogen ions and hydroxide ions, the
output from the electrode is 0.0 mV and pH is 7. The millivolt signal is measured by
pHX and the corresponding pH is calculated in BB2.
mV pH H
+
ions, Mol/l OH
-
ions, Mol/l Example
414 0 1 0,000000000000
01
355 1 0,1 0,000000000000
1
296 2 0,01 0,000000000001 Coca Cola
237 3 0,001 0,00000000001
177 4 0,0001 0,0000000001 Orange juice
118 5 0,00001 0,000000001
59 6 0,000001 0,00000001 Milk
0 7 0,0000001 0,0000001 Clean water
-59 8 0,00000001 0,000001 Blood
-118 9 0,000000001 0,00001
-177 10 0,0000000001 0,0001
-237 11 0,00000000001 0,001
-296 12 0,000000000001 0,01
-355 13 0,0000000000001 0,1
-414 14 0,0000000000000
1
1 Sulfa