7.73 The concentration of sulphide ion in 0.1M HCl solution saturated with hydrogen sulphide is 1.0 × 10–19 M. If 10 mL of this is added to 5 mL of 0.04 M solution of the following: FeSO4, MnCl2, ZnCl2 and CdCl2. in which of these solutions precipitation will take place?
7.73 The concentration of sulphide ion in 0.1M HCl solution saturated with hydrogen sulphide is 1.0 × 10–19 M. If 10 mL of this is added to 5 mL of 0.04 M solution of the following: FeSO4, MnCl2, ZnCl2 and CdCl2. in which of these solutions precipitation will take place?
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1 Answer
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For precipitation to take place, it is required that the calculated ionic product exceeds the Ksp value. So, following data on Ksp values should have been provided to answer the question.
KspforFeS=6.3×10−18,
MnS=2.5×10−13,
ZnS=1.6×10−24
CdS=8.0×10−27
Before mixing:
[S2−]=1.0×10−19M and [M2+]=0.04M
volume =10mL volume =5mL
After mixing:
[S2−]=? [M2+]=?
volume = (10+5)=15mL volume =15mL
[S2−]= (1.0×10−19×10)/ 15=6.67×10−20M
[M2+]= (0.04×5) / 15=1.33×10−2M
Ionic prod
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