The Kjeldahl analysis in Section 10-8 is used to measure the nitrogen content of organic compounds, which are digested in boiling sulfuric acid to decompose to ammonia, which, in turn, is distilled into standard acid. The remaining acid is then back-titrated with base. Kjeldahl himself had difficulty in 1880 discerning by lamplight the methyl red indicator end point in the back titration. He could have refrained from working at night, but instead he chose to complete the analysis differently. After distilling the ammonia into standard sulfuric acid, he added a mixture of KIO3 and KI to the acid. The liberated iodine was then titrated with thiosulfate, using starch for easy end-point detection - even by lamplight.31 Explain how the thiosulfate titration is related to the nitrogen content of the unknown. Derive a relationship between moles of NH3 liberated in the digestion and moles of thiosulfate required for titration of iodine.