Source: https://www.academia.edu/43198391/BUT_DE_TP_D%C3%A9termination_de_lordre_dune_r%C3%A9action_La_reaction_propos%C3%A9e_Na_2_S_2_O_3_H_2_SO_4_Na_2_SO_4_H_2_O_S_SO_2_D%C3%A9finition_de_la_vitesse_de_r%C3%A9action.pdf