Medium

[Co³⁺] (M) in vitamin B₁₂

Determined [Co³⁺] (M)

$\overline{x}$

s

$\overline{x}\pm ts/\sqrt{N}$

1.0 M NH₃/NH₄Cl buffer

(pH = 9.8)

7.4 × 10⁻⁴

7.2 × 10⁻⁴

7.5 × 10⁻⁴

7.3 × 10⁻⁴

7.5 × 10⁻⁴

7.4 × 10⁻⁴

1.5 × 10⁻⁵

(7.4 ± 0.2) × 10⁻⁴