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Formula and Combining Compounds

  • Thread starter cheerspens
  • Start date
  • #1
92
0

Homework Statement


What is the formula and name of the compound by combining Pb2+ and CrO42-


Homework Equations


none


The Attempt at a Solution


I thought it was Pb2(CrO4)2 - Lead Chromate.
Why is this wrong and how do I correct it?
 

Answers and Replies

  • #2
867
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When writing ionic compounds, you use the smallest number ratio between the ions; you don't always "switch" the charges. Instead of a 2:2 ratio, use a 1:1 ratio for the formula, PbCrO4.
The name is wrong because you need to specify the charge of lead since it has a variable charge.
 
  • #3
Char. Limit
Gold Member
1,204
14
By the way...

Pb2+[/sub] = Plumbous
Pb4+[/sub] = Plumbic
 
  • #4
92
0
Is PbCrO4 - Lead II Chromate correct?
 
  • #5
Borek
Mentor
28,410
2,812
Looks Ok to me, but Eglish nomenclature is not my forte.
 
  • #6
Char. Limit
Gold Member
1,204
14
That'll work too.

I just prefer the old system.

Lead(II) Chromate is good.
 

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