Ew people these days print photographs in paper. to develop a film, a mix of various chemicals are used through the photographic process. in the final step, a fixer stabilises the image on paper by removing the unexposed silver salt (agx, usually a bromide). this is achieved by treating the film or paper with a solution of thiosulphate salt (of sodium or ammonium). if not used, the excess agx would darken and fog the image~! an old sodium thiosulphate (na2s2o3, 158.2 g/mol) solution is labelled 0.260 m. to verify this, during a redox titration of 0.136 l of this solution, 41.58 ml of 0.237 m iodine solution were needed to reach the equivalence point. what is the percentage of sodium thiosulphate found with respect to that labelled?