If,
[H⁺] = 1.56 × 10⁻⁴ M
Then,
pH = -log (1.56 × 10⁻⁴)
pH = 3.80
Also,
pH + pOH = 14
So,
pOH = 14- 3.80
pOH = 10.2
Taking Anti log of pOH,
[OH⁻] = 10⁻¹⁰°²
[OH⁻] = 6.30 × 10⁻¹¹
Result:
For [H⁺] = 1.56 × 10⁻⁴ other true statements are,
1) [OH⁻] = 6.30 × 10⁻¹¹
2) pH = 3.80
3) pOH = 10.2