Two students, A and B, are conducting an experiment in gravimetric analysis. They are attempting to determine the quantity of silver in a sample by precipitating the silver as silver acetate, \(\ce{AgC2H3O2}\) , which has Ksp =\(4 \times 10^{-3}\). Both students precipitate the silver from solution by adding an excess of 0.10 M sodium acetate, \(\ce{NaC2H3O2}\) solution. Once all the silver has precipitated, student A washes the precipitate several times with sodium acetate solution, and finally once with a little distilled water while student B washes the solution several times with distilled water. Once washed, both students dry and weigh the precipitate. Based upon the masses of the dried precipitates, each student calculates the percent silver in the sample. How do the results of the student results compare to the correct percent of silver in the sample?
A.
The values are too low with student B being closer than student A.
B.
The values are too high with student B being closer than student A.
C.
The values are too high with student A being closer than student B.
D.
The values are too low with student A being closer than student B
Exam No:AP Chemistry Problem Set 8 Year:2024 Question No:APChemistry2024AP0252
Answer:
D
Knowledge points:
7.12 Common-Ion Effect
Solution:
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