Question

The pH of a solution ranges from 0 to 14. An acid has a pH less than 7. Pure water is neutral and has a pH of 7. The pH of a solution is given by pH = -logx where x represents the concentration of the hydrogen ions in the solution in moles per liter. Find the pH if the hydrogen ion concentration is 1 x 10^-1
A. 13
B. 1
C. -13
D. -1

Answer 1

We need to know some log properties

1. when the base is not stated, assume that it is base 10 or log₁₀
2. $log_aa^x=x$

-log(10^-1)=$log_{10}10^{-1}=-1$

answer is D. -1