Answer
(a) $pH = 7.28$
(b) $pH = 6.42$
(c) $pH = 3.86$
(d) $pH = 12.98$
Work Step by Step
1. Calculate the pOH:
$pOH = -log[OH^-]$
$pOH = -log( 1.9 \times 10^{- 7})$
$pOH = 6.72$
2. Find the pH:
$pH + pOH = 14$
$pH + 6.72 = 14$
$pH = 7.28$
3. Calculate the pOH:
$pOH = -log[OH^-]$
$pOH = -log( 2.6 \times 10^{- 8})$
$pOH = 7.58$
4. Find the pH:
$pH + pOH = 14$
$pH + 7.58 = 14$
$pH = 6.42$
5. Calculate the pOH:
$pOH = -log[OH^-]$
$pOH = -log( 7.2 \times 10^{- 11})$
$pOH = 10.14$
6. Find the pH:
$pH + pOH = 14$
$pH + 10.14 = 14$
$pH = 3.86$
7. Calculate the pOH:
$pOH = -log[OH^-]$
$pOH = -log( 0.095)$
$pOH = 1.02$
8. Find the pH:
$pH + pOH = 14$
$pH + 1.02 = 14$
$pH = 12.98$
