Pb(MnO4)2: Lead Permanganate Formula

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Discussion Overview

The discussion revolves around the formula for lead(II) permanganate, specifically addressing the naming conventions and chemical composition involved. Participants explore the meanings of prefixes and the relationship between different oxyanions, with a focus on the implications of the term "permanganate" and its comparison to "manganate."

Discussion Character

  • Homework-related
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant expresses uncertainty about the meaning of the prefix "per-" and its implications for the oxidation state of the central atom.
  • Another participant notes that the naming conventions for substances like lead(II) permanganate can be considered half-systematic and half-conventional, suggesting that some names are best memorized.
  • A later reply highlights the importance of knowing the distinction between manganate and manganese in the context of the problem.
  • There is a discussion about the differences between acids and peracids, particularly in terms of the number of oxygen atoms and the charge of the oxyanion.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the naming conventions and the implications of the terms used, indicating that multiple views remain regarding the systematic naming of chemical compounds.

Contextual Notes

Participants mention the need for clarity on the definitions of manganate and manganese, as well as the potential confusion arising from the naming conventions of oxyanions.

BrainMan
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Homework Statement


Write the formula of : lead(2) permanganate

Homework Equations


The Attempt at a Solution


So I know that this formula is the combination of lead magnesium and oxygen. I know that the -ate suffix means that it has the most number of oxygen ions possible. The answer was Pb (MnO4)2. I don't know what
1- the prefix per- means
2 - how to find the number of Oxygen molecules
3- how to find the magnesium oxyanion
4- how to find the charge of a substance based on its location on the periodic table
thanks in advance!
 
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No way to answer your questions without knowing what manganate is. Lead(II) permanganate is not a systematic name, half-systematic name at best.

per- means acid with the highest oxidation state of the central atom (or the highest number of oxygen atoms combined with the central atom).

Naming of many substances is half-systematic, half-conventional. Unfortunately, that means many of these names are best remembered.
 
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Borek said:
No way to answer your questions without knowing what manganate is. Lead(II) permanganate is not a systematic name, half-systematic name at best.

per- means acid with the highest oxidation state of the central atom (or the highest number of oxygen atoms combined with the central atom).

Naming of many substances is half-systematic, half-conventional. Unfortunately, that means many of these names are best remembered.

OK thanks! I didn't notice that the problem gave the formula for manganese. I figured it out.
 
BrainMan said:
problem gave the formula for manganese

Manganese? Or manganate?
 
Borek said:
Manganese? Or manganate?

Sorry I meant manganate.
 
OK, that makes the problem easier.

Still, sometimes difference between acid and peracid is number of oxygens (ClO3- vs ClO4-), sometimes it is charge of the oxyanion (MnO42- vs MnO4-).
 

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