what would cause a black precipitate to form when a titration of silver nitrate takes place.
the only chemicals involved are sodium hypochlorite (NaClO), water (H2O) and silver nitrate (AgNO3)
the only thing I can think of that would cause a black precipitate is silver sulphide (Ag2S) but since there is no sulphur in the reaction I can't think what else could be forming to create this black precipitate.
thank you for any help