Answer
(a) pH = 5.5, Acidic solution;
(b) pH = 9.8, Basic solution;
(c) pH = 12.3, Basic solution;
(d) pH = 7.0, Neutral solution.
Work Step by Step
pH > 7 and pOH < 7: Basic solution.
pH = pOH = 7: Neutral solution.
pH < 7 and pOH >7: Acidic solution.
1. Calculate the pH value:
pH + pOH = 14
$pH$ + $ 8.5 = 14$
$pH$ = 14 - 8.5 = 5.5
2. Calculate the pH value
pH + pOH = 14
$pH$ + $ 4.2 = 14$
$pH$ = 14 - 4.2 = 9.8
3. Calculate the pH value
pH + pOH = 14
$pH$ + $ 1.7 = 14$
$pH$ = 14 - 1.7 = 12.3
4. Calculate the pH value
pH + pOH = 14
$pH$ + $ 7 = 14$
$pH$ = 14 - 7.0 = 7.0
