Find log_10(0.00001).

Introduction / Context:
Recognize small decimal powers as powers of 10 to evaluate common logarithms directly.

Given Data / Assumptions:
0.00001 = 10^{−5}.

Concept / Approach:
Use log_10(10^k) = k.

Step-by-Step Solution:

Why Other Options Are Wrong:
−6, −7 represent incorrect counting of decimal places.

Final Answer:
−5