Qualitative analysis of Barium, Strontium, Calcium

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SUMMARY

The qualitative analysis of Barium, Strontium, and Calcium involves the use of ammonium compounds such as NH4CO3, NH4OH, and NH4Cl to facilitate the precipitation of hydroxides and carbonates. The presence of multiple ammonium ions is crucial for ensuring complete reactions and accurate identification of the metal ions in solution. For instance, the reaction of Sr(Cl)2 with NH4OH results in the precipitation of Sr(OH)2, while Ca(Cl)2 reacts with (NH4)2CO3 to form CaCO3. These reactions highlight the importance of ammonium ions in achieving desired outcomes in qualitative analysis.

PREREQUISITES
  • Understanding of qualitative analysis techniques in chemistry
  • Knowledge of the common ion effect in solution chemistry
  • Familiarity with ammonium compounds and their roles in precipitation reactions
  • Basic principles of ionic reactions and solubility rules
NEXT STEPS
  • Study the role of the common ion effect in qualitative analysis
  • Research the solubility rules for hydroxides and carbonates
  • Learn about the preparation and use of ammonium carbonate in laboratory settings
  • Explore the detailed mechanisms of precipitation reactions involving metal chlorides and ammonium compounds
USEFUL FOR

Chemistry students, laboratory technicians, and professionals involved in qualitative analysis of metal ions will benefit from this discussion.

chound
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During qualitative analysis of Barium, Strontium, Calcium, why do we use NH4CO3, NH4OH, NH4Cl. Even if we were to apply common ion effect, two NH4+ ions are enough right? What is the need for third one?
 
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I assume that you are referring to the ammonium chloride?

It might be there to completely describe what you might expect to find in your test tube after adding NH4OH or NH4CO3 [(NH4)2CO3? or (NH4)HCO3?] to your unknown which is probably a soluble chloride salt.

eg.

Sr(Cl)2 + 2NH4OH -----> Sr(OH)2(s) + 2 NH4Cl

Ca(Cl)2 + (NH4)2CO3 -----> CaCO3(s) + 2 NH4Cl
 

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