How were cations divided into groups for salt analysis?

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SUMMARY

Cation division in salt analysis is based on the solubility of their respective salts, leading to the classification into six distinct groups. Specific metals precipitate as sulphides or sulphates due to their unique solubility characteristics. The analytical procedure is designed after thorough experimental checks of these solubilities, ensuring accurate identification during the analysis process. This systematic approach allows chemists to effectively separate and identify cations in various samples.

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  • Research the solubility rules for common cations in analytical chemistry
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Chemistry students, laboratory technicians, and professionals involved in analytical chemistry and salt analysis will benefit from this discussion.

jd12345
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How does salt analysis work? How did they divide cations into these 6 groups?
I'm confused over things like:- In a group we precipitate metals through their sulphides - but only few of the metals precipitate - why only specific emtals precipitate. Then in another group we precipitate metals as sulphates, again only specific metals precipitate

Why is this? How on Earth did they divide cations into such groups?
 
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First, they experimentally checked solubilities of salts. Then, they designed analytical procedure based on this knowledge.
 

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