2. In one gravimetric analysis, the aluminum in a 1.2g sample of impure NHA1(SO4)2 was precipitate as hydrous ALO3.XH2O. The precipitate was filtered and ignited at 1000 °C to give anhydrous Al2O3 which weighed 0.1798g. Calculate the % Al inthe sample.
2. In one gravimetric analysis, the aluminum in a 1.2g sample of impure NHA1(SO4)2 was precipitate as hydrous ALO3.XH2O. The precipitate was filtered and ignited at 1000 °C to give anhydrous Al2O3 which weighed 0.1798g. Calculate the % Al inthe sample.
Chapter12: Gravimetric Methods Of Analysis
Section: Chapter Questions
Problem 12.20QAP
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Transcribed Image Text:2. In one gravimetric analysis, the aluminum in a 1.2g sample of impure
NHAI(SO4)2 was precipitate as hydrous ALO3.XH2O. The precipitate was
filtered and ignited at 1000 °C to give anhydrous Al2O3 which weighed 0.1798g.
Calculate the % Al inthe sample.
3. A sample of 0.4500g impure potassium chloride was dissolved in water treated
with excess silver nitrate solution. 0.8402 g of silver chloride was precipitated.
What is the percentage of potassium chloride in the sample?
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