If The $K _ { w }$ For Water At $80 ^ { \circ } \mathrm { C }$

Multiple Choice

If the $K _ { w }$ for water at $80 ^ { \circ } \mathrm { C }$ is $5.60 \times 10 ^ { - 11 }$ , the $\mathrm { p } K _ { w }$ for water at the same temperature is _____.

A) 12.8
B) 10.3
C) 13.9
D) 9.80
E) 7.50