20.
K values are not constant with respect to temperature. For example, as the temperature of water increases, the K value increases. At
37
o
C
, the
K
w
= 2.4 x
10
-14
. Given:
K
w
= [ H
+
][ OH
-
],
pure water at
37
o
C
has a pH:
a) 7
b) greater than 7
c) less than 7
d) pH is invalid at such a temperature
