Animal charcoal and titration

• galaxy_twirls

  9 Oct 09, 06:21

  Hi everyone. I have a question with regards to animal charcoal and its use in laboratory titration. I recalled reading in some books that animal charcoal can remove dyes and pigments in liquids, so I was wondering if I can add animal charcoal to the liquid that I had titrated and boil it after putting some animal charcoal to remove the indicator present in the liquid. The indicator is methyl orange or universal indicator but I wonder if animal charcoal can remove the methyl orange or universal indicator. If the indicator in the liquid for titration cannot be removed by animal charcoal, what can we use to remove it? Thank you very much for helping. ^^

• UltimaOnline

  9 Oct 09, 09:48

  The purpose of an indicator is to indicate to you the volumes (assuming fixed molarities) of reactants used (titrant and titrand) to reach equivalence point, which is approximated by endpoint (ie. when a suitable indicator changes color). If after knowing the required volumes (hence moles of titrant and titrand may be calculated), you wish to obtain a pure sample of the salt at equivalence point, you must redo the titration without indicator. There is no shortcut, using animal charcoal or any other type of charcoal, or any simple method (ie. it's much less trouble to simply redo the titration), to separate the indicator from the salt solution at equivalence point. Uses of animal charcoal : http://en.wikipedia.org/wiki/Animal_charcoal
• yiha093

  9 Oct 09, 19:23

  my teacher got teach say burn with charcoal can remove indicator. o,o

  perhaps cause syllabus eh ?

• galaxy_twirls

  10 Oct 09, 10:17

  Ooh I see. So I should just write: "Repeat the titration process without the indicator to obtain the salt..." Hmm... perhaps I have read wrongly or something. >.< Thanks a lot. ^^