912. pOH
pOH is mathematically defined as:
log [OH] or log 1/[OH]
NOTE:
pH and pOH have no unit of report.
913. pH SCALE
a. pH range: 014
b. Neutral: pH 7
c. Acidic: less than pH 7
d Basic: greater than pH 7
pH below 7
pH = 7
pH above 7

0
14
More
Neutral
More
Acidic
Basic
In examining the definition of pH, we find that there is an inverse relationship
+
between hydrogen ion concentration and pH. As [H ] increases, pH decreases and vice
versa. Also, notice that each increase of one unit on the pH scale corresponds to a
tenfold decrease in [H+], and each decrease of one unit on the pH scale corresponds to
+
+

a tenfold increase in [H ]. If this is true, then as the [H ] increases, [HO ] decreases,
+

and as [H ] decreases, [OH ] increases.
914. pOH SCALE
a. pOH range: 0 14
b. Neutral: pOH 7
c. Acidic: greater than pOH 7
d. Basic: less than pOH 7
pOH below 7
pOH = 7
pOH above 7

0
14
More
Neutral
More
Basic
Acidic
MD0837
911