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Old June 27th, 2006, 11:41
lyvalu lyvalu is offline
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Default gravimetric analysis question...
why is the precipitate washed until it is chloride free? how can chloride ion in the filtrate be tested for?

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Old June 28th, 2006, 08:48
opuntia opuntia is offline
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I don't know the answer for the first part, but for the second part (if i'm not mistaken :wink: ) you must use acidified aqueous AgNO3 and aqueous NH3(dilute) If the white precipitate formed is completely soluble in dilute NH3 then it means the filterate contains Cl- ion.
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Old July 2nd, 2006, 18:03
RobJim RobJim is offline
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Chloride ions have mass. Gravimetric analysis is about determining mass. You want the mass of something other than the chloride ions I imagine.
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