April 29, 2024, 06:55:28 AM
Forum Rules: Read This Before Posting


« previous next »
Pages: [1]   Go Down

Topic: Identifying false formula...  (Read 1660 times)

0 Members and 1 Guest are viewing this topic.

Offline schafer

  • Regular Member
  • ***
  • Posts: 12
  • Mole Snacks: +0/-0
Identifying false formula...
« on: April 26, 2014, 11:04:53 AM »
Hey,
I'm preparing for a test, and I keep getting stuck on questions where I need to identify the incorrect chemical formula.
Here is an example of such question:

Which one of the following formulas is NOT correct?
CsNO3
GaCO3
Ba(HCO3)2
BeSO4
SnS2

At first I tried checking the oxidation numbers, but it didn't do the trick...

How do you solve such questions?
Thanks
« Last Edit: April 26, 2014, 11:44:11 AM by schafer »
Logged

Offline Hunter2

  • Sr. Member
  • *****
  • Posts: 2180
  • Mole Snacks: +168/-48
  • Gender: Male
  • Vena Lausa moris pax drux bis totis
Re: Identifying false formula...
« Reply #1 on: April 26, 2014, 12:18:32 PM »
Check the anions and their charge. Look up the cations in which group they are in PSE. Compare the charges , oxidation number.

Logged

Offline Big-Daddy

  • Sr. Member
  • *****
  • Posts: 1177
  • Mole Snacks: +28/-94
Re: Identifying false formula...
« Reply #2 on: April 26, 2014, 01:43:16 PM »
The oxidation numbers in CO32- will be the same as in GaCO3. With that in mind, you find an oxidation number of +2 for Ga inevitably, as the other group has -2. And where is Ga in the periodic table?
Logged
Pages: [1]   Go Up
« previous next »
Sponsored Links