Answer all the question below, 1. In one gravimetric analysis, a sample that weighed 0.810g is analysed for its phosphorous (P) content by precipitating the phosphorous as Mg,P,0,. The precipitate is filtered, washed and weighed. The mass of the precipitate is found to be 0.4250 g. a) Why must the precipitate be washed? b) Calculate the percentage of P.

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Chapter1: Chemical Foundations
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Answer all the question below,
1. In one gravimetric analysis, a sample that weighed 0.810g is analysed for its
phosphorous (P) content by precipitating the phosphorous as Mg,P2O. The precipitate
is filtered, washed and weighed. The mass of the precipitate is found to be 0.4250 g.
a) Why must the precipitate be washed?
b) Calculate the percentage of P.
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 Al203 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?
Transcribed Image Text:Question 2 Answer all the question below, 1. In one gravimetric analysis, a sample that weighed 0.810g is analysed for its phosphorous (P) content by precipitating the phosphorous as Mg,P2O. The precipitate is filtered, washed and weighed. The mass of the precipitate is found to be 0.4250 g. a) Why must the precipitate be washed? b) Calculate the percentage of P. 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 Al203 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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