Kinetics and Mechanism of the Oxidation of Naphthol Green B by Peroxydisulphate Ion in Aqueous Acidic Medium

Table 3

Rate data for the effect of added anions (SO₄²⁻ and CH₃COO⁻) on the rate of reaction of naphthol green B with S₂O₈²⁻ at [NGB³⁻] = 4.0×10⁻⁵ mol dm⁻³, [S₂O₈²⁻] = 5.6×10⁻³ mol dm⁻³, [H⁺] = 1.0×10⁻⁴ mol dm⁻³, 𝐼=0.50 mol dm⁻³, 𝜆=700 nm, and 𝑇 = 23±1°C.

Ion	10^3[ion], mol dm^−3	10^3𝑘1, s^−1	𝑘2, dm^3 mol^−1 s^−1
SO4^2−	1.0	7.26	1.30
	5.0	6.60	1.18
	10.0	5.60	1.00
	20.0	5.32	0.95
	80.0	3.26	0.58
CH3COO^−	1.0	6.45	1.15
	2.0	4.19	0.75
	3.0	2.88	0.51
	4.0	2.69	0.48
	5.0	1.77	0.32