اسئلة اضافيةQUANTITATIVE CALCULATION1. A 523.1-mg sample of impure KBr is treated with excess AgNO, and814.5 mg AgBr is obtained. What is the purity of the KBr?2. What weight of Fe₂O3 precipitate would be obtained from a 0.4823-gsample of iron wire that is 99.89% pure?3. The aluminum content of an alloy is determined gravimetrically byprecipitating it with 8-hydroxyquinoline (oxine) to give Al(C,H,ON)3. Ifa 1.021-g sample yielded 0.1862 g of precipitate. what is the percentaluminum in the alloy?4. Iron in an ore is to be analyzed gravimetrically by weighing as Fe₂O3.It is desired that the results be obtained to four significant figures. If theiron content ranges between 11 and 15%, what is the minimum sizesample that must be taken to obtain 100.0 mg of precipitate?5. The chloride in a 0.12-g sample of 95% pure MgCl₂ is to beprecipitated as AgC1. Calculate the volume of 0.100 M AgNO3 solutionrequired to precipitate the chloride and give a 10% excess.6. Ammonium ions can be analyzed by precipitating withH₂PtCl, as(NH4)2PtCl, and then igniting the precipitate to platinum metal, which isweighed [(NH4)2PtCl6 -he-a-t Pt + 2NH4C1(g) +2C1₂(g)]. Calculate the percent ammonia in a 1.00-g sample that yields0.100 g Pt by this method.7. A sample is to be analyzed for its chloride content by precipitating andweighing silver chloride. What weight of sample would have to be takenso that the weight of precipitate is equal to the percent chloride in thesample?8. Pyrite ore (impure FeS₂) is analyzed by converting the sulfur to sulfateand precipitating BaSO4. What weight of ore should be taken for analysis

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1. A 523.1-mg sample of impure KBr is treated with excess AgNO3 and 814.5 mg AgBr is obtained. What is the purity of the KBr?

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Question

اسئلة اضافية
QUANTITATIVE CALCULATION
1. A 523.1-mg sample of impure KBr is treated with excess AgNO, and
814.5 mg AgBr is obtained. What is the purity of the KBr?
2. What weight of Fe₂O3 precipitate would be obtained from a 0.4823-g
sample of iron wire that is 99.89% pure?
3. The aluminum content of an alloy is determined gravimetrically by
precipitating it with 8-hydroxyquinoline (oxine) to give Al(C,H,ON)3. If
a 1.021-g sample yielded 0.1862 g of precipitate. what is the percent
aluminum in the alloy?
4. Iron in an ore is to be analyzed gravimetrically by weighing as Fe₂O3.
It is desired that the results be obtained to four significant figures. If the
iron content ranges between 11 and 15%, what is the minimum size
sample that must be taken to obtain 100.0 mg of precipitate?
5. The chloride in a 0.12-g sample of 95% pure MgCl₂ is to be
precipitated as AgC1. Calculate the volume of 0.100 M AgNO3 solution
required to precipitate the chloride and give a 10% excess.
6. Ammonium ions can be analyzed by precipitating withH₂PtCl, as
(NH4)2PtCl, and then igniting the precipitate to platinum metal, which is
weighed [(NH4)2PtCl6 -he-a-t Pt + 2NH4C1(g) +
2C1₂(g)]. Calculate the percent ammonia in a 1.00-g sample that yields
0.100 g Pt by this method.
7. A sample is to be analyzed for its chloride content by precipitating and
weighing silver chloride. What weight of sample would have to be taken
so that the weight of precipitate is equal to the percent chloride in the
sample?
8. Pyrite ore (impure FeS₂) is analyzed by converting the sulfur to sulfate
and precipitating BaSO4. What weight of ore should be taken for analysis

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