Hello, I have i question about Substances Reducing Dichromate on acetic acid in the ACS monography . I have a problem to determinate the volume of 0.1N potassium dichromate consumed. because I have A stoechiometric factor of 2 on Sodium thiosulfate 0.1 N when I write the equations of the reaction . Could you explain me that . Sorry for my bad english . Thank in advance