Answer
(a) 1.35 : Basic solution.
(b) 11.51 : Acidic solution.
(c) 4.27 : Basic solution
(d) 1.92 : Basic solution.
Work Step by Step
pOH < 7: Basic solution
pOH = 7: Neutral solution
pOH > 7: Acidic solution
1. Calculate the pOH value:
$pOH = -log[OH^-]$
$pOH = -log(0.045)$
pOH = 1.35
2. Calculate the pOH value:
$pOH = -log[OH^-]$
$pOH = -log(3.1 \times 10^{-12})$
pOH = 11.51
3. Calculate the pOH value:
$pOH = -log[OH^-]$
$pOH = -log(5.4 \times 10^{-5})$
pOH = 4.27
4. Calculate the pOH value:
$pOH = -log[OH^-]$
$pOH = -log(0.012)$
pOH = 1.92