Chemical Forums
Chemistry Forums for Students => Undergraduate General Chemistry Forum => Topic started by: noork85 on February 16, 2012, 01:07:15 AM
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ok so i had to identify the unknown compound, which actually for me was Sodium carbonate. i dont know if i did this correctly because there was alot of confusion with my lab partner (screwed me big time, couldnt even count drops; i will be getting a new lab partner next week!) and time constraints i wasnt able to finish it up. I asked the prof if i could repeat it and ofcourse, she said no. just ignore the unknown compound section, but is the rest of it correct?
i was supposed to find out whether the reaction is a gas, precipitate appears or disappears, or if the color changes.
the link here is the complete lab.
http://survival-training.survival-training.net/Library/Chemistry/Chemistry%20-%20Identification%20of%20unknown%20compound%20-%20Unknown.pdf (http://survival-training.survival-training.net/Library/Chemistry/Chemistry%20-%20Identification%20of%20unknown%20compound%20-%20Unknown.pdf)
this image shows my results. any help will be highly appreciated! thanks!
(https://www.chemicalforums.com/proxy.php?request=http%3A%2F%2Fi.imgur.com%2FXjfMl.jpg&hash=4b9fa124227430530d470e5e3a2c723e46d5dfec)
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The table below has some errors already. If yiou had silver nitrate and nitric acid also aprecipitate will take place.
You have to write down the observation from your sample and look, does it fit in on of the rows.
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i cant redo the lab. can you please point out the errors? thanks!
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You said you get a developing of gas. Only one substance can do it in your list. Which one?
Wrong are the results NaCl or NaI with silvernitrate + nitric acid.
Phosphate dont develop gas, and also precipitate of sulfat doesnt dissapear with acidic conditions.