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Topic: problem with chloride determination  (Read 3146 times)

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Offline aeacfm

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problem with chloride determination
« on: June 22, 2010, 08:44:02 AM »
when i was carrying out chloride titration when i add the chromate indicator the color appeared is not yellow as what it must appear but yellow closer to orange so when i add the AgNO3 reagent the end point like ghost so i cant detect it clearly !!!!!
do any body know what is that (what is the source of that error , how can i avoid it ?

Offline Woofuls

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Re: problem with chloride determination
« Reply #1 on: June 24, 2010, 09:03:26 PM »
Are you using chromate or dichromate? If it is orange, try adding a small amount of sodium hydroxide to see if it goes yellow.

Offline brain

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Re: problem with chloride determination
« Reply #2 on: June 29, 2010, 04:05:47 PM »
when i was carrying out chloride titration when i add the chromate indicator the color appeared is not yellow as what it must appear but yellow closer to orange so when i add the AgNO3 reagent the end point like ghost so i cant detect it clearly !!!!!
do any body know what is that (what is the source of that error , how can i avoid it ?

hi try to prepare a fresh indicator
your indicator expired

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