Answer
$13.5$
Work Step by Step
Apply logarithmic property : $\log m+ \log n=\log (mn)$
We can write the equation as:
$ pH=-\log [3.2 \times 10^{-14}] =-[\log 3.2 + \log 10^{-14}]$
Now, apply logarithmic property : $\log a^ b=b \log a$
Therefore, our answer is: $-[\log 3.2 - 14 \log 10]=-[0.5051-14]= 13.5$