Chemical Forums

Please login or register.

Login with username, password and session length

Sponsored links

Pages: [1]   Go Down

Author Topic: identify unknown compound! help  (Read 1226 times)

0 Members and 1 Guest are viewing this topic.

noork85

  • Regular Member
  • ***
  • Mole Snacks: +0/-2
  • Offline Offline
  • Posts: 31
identify unknown compound! help
« on: February 15, 2012, 07:07:15 PM »

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
this image shows my results. any help will be highly appreciated! thanks!
Logged

Hunter2

  • Sr. Member
  • *****
  • Mole Snacks: +98/-34
  • Offline Offline
  • Gender: Male
  • Posts: 1293
  • Vena Lausa moris pax drux bis totis
Re: identify unknown compound! help
« Reply #1 on: February 15, 2012, 11:07:07 PM »

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.
Logged

noork85

  • Regular Member
  • ***
  • Mole Snacks: +0/-2
  • Offline Offline
  • Posts: 31
Re: identify unknown compound! help
« Reply #2 on: February 16, 2012, 08:32:45 AM »

i cant redo the lab. can you please point out the errors? thanks!
Logged

Hunter2

  • Sr. Member
  • *****
  • Mole Snacks: +98/-34
  • Offline Offline
  • Gender: Male
  • Posts: 1293
  • Vena Lausa moris pax drux bis totis
Re: identify unknown compound! help
« Reply #3 on: February 16, 2012, 10:21:38 PM »

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.
Logged
Pages: [1]   Go Up
 

Mitch Andre Garcia's Chemical Forums 2003-Present.

Page created in 0.057 seconds with 23 queries.