How Accurate Is Gravimetric Analysis in Determining Mineral Composition?

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SUMMARY

The discussion centers on the accuracy of gravimetric analysis in determining the mineral composition of a geological sample containing Boulangerite (Pb5Sb4S11). A 6.34-g sample yielded 3.80 g of PbCl2 after chemical treatment, leading to the calculation of the percentage by mass of Pb5Sb4S11 in the sample. Participants discussed the necessary equations, including n=m/MM and %yield=(actual yield/theoretical yield) * 100, to derive the mineral's composition. The conversation highlights the importance of understanding mole calculations to accurately assess the mineral content.

PREREQUISITES
  • Understanding of gravimetric analysis techniques
  • Familiarity with mole calculations and molar mass (n=m/MM)
  • Knowledge of chemical reactions involving lead compounds
  • Ability to calculate percentage yield in chemical processes
NEXT STEPS
  • Research the principles of gravimetric analysis in mineralogy
  • Learn how to calculate molar mass for complex compounds like Pb5Sb4S11
  • Explore the methods for determining percentage composition in mineral samples
  • Study the chemical properties and reactions of lead compounds, particularly PbCl2
USEFUL FOR

Chemistry students, mineralogists, and professionals involved in geological analysis will benefit from this discussion, particularly those focused on quantitative analysis methods in mineral composition determination.

salman213
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The Title should actually be "Gravimetric Analysis"

srry about that but i can't change it now :(

1.
A 6.34-g geological sample, containing the mineral Boulangerite (Pb5Sb4S11) as the only lead-bearing compound, is subjected to chemical treatment in which the lead is quantitatively recovered as solid PbCl2. The mass of PbCl2 obtained is 3.80 g.
What was the percentage (by mass) of Pb5Sb4S11 in the sample?



2. n=m/MM
%yield= (actual yield over theoretical yield) * 100




3. Well I am guessing the equation is something like

Pb5Sb4S11 -------> PbCl2(s)

how to get cl in there or SbS out :S

mass is given as 3.8g


I have no clue
can someone can get me started atleast?
 
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salman213 said:
The Title should actually be "Gravimetric Analysis"

srry about that but i can't change it now :(

1.
A 6.34-g geological sample, containing the mineral Boulangerite (Pb5Sb4S11) as the only lead-bearing compound, is subjected to chemical treatment in which the lead is quantitatively recovered as solid PbCl2. The mass of PbCl2 obtained is 3.80 g.
What was the percentage (by mass) of Pb5Sb4S11 in the sample?



2. n=m/MM
%yield= (actual yield over theoretical yield) * 100

3. Well I am guessing the equation is something like

Pb5Sb4S11 -------> PbCl2(s)

how to get cl in there or SbS out :S

mass is given as 3.8g


I have no clue
can someone can get me started atleast?

If you knew the total number of moles of lead in the original sample could you use it to find out how many moles of [tex]Pb_5Sb_4S_{11}[/tex] were in the original sample?
 

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