Sequential Qualitative Analysis?!?!

Chemistry
Tutor: None Selected Time limit: 1 Day

Aug 4th, 2015

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test for acetate

to the solution given, add  lead ii nitrate solution, a black precipitate of lead ii nitrate is formed confirming the presence of the nitrate ions

Pb +HCOOH-Pb(COOH)2

TEST FOR CARBONATE

to the solution add dilute hydrochloric acid, a gas is produced that forms white precipitate


Please let me know if you need any clarification. I'm always happy to answer your questions.
Aug 4th, 2015

why would you need to confirm the presence of nitrate ions when we need to confirm the presence of acetate ions?


Aug 4th, 2015

you add lead nitrate solution to obtain free lead ions to react with the acetate

thank you so much

Aug 4th, 2015

I'm still not following, couldn't you add silver to test for acetate, if a precipitate forms then acetate is present, the precipitate formed would be silver acetate???!?!

Aug 4th, 2015

yes silver acetate also precipitate but lead acetate will form black precipitate hence can be used still

thank you so much

Aug 4th, 2015

So both are correct? what would form a precipitate with CO3??

Aug 4th, 2015

the CO2 formed in carbonate forms a white precipitate with calcium hydroxide

thank you so much.

Aug 5th, 2015

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