The percentage composition of a mixture can be determined by exploiting differen

Question

The percentage composition of a mixture can be determined by exploiting differences between the physical properties of its components. Sand (SiO_2, ) is insoluble in water, ammonium chloride (NH_4Cl) sublimes and sodium chloride (Nail) is soluble in water. A sample of a mixture of SiO_2 (sand), NH_4Cl and NaCl was first heated to facilitate sublimation. Water was then added to the remaining sample to dissolve the NaCl and facilities removal of the SiO_2. Use the data below to determine the percent composition of mixture. Give three (3) methods of separation that were used in this method besides sublimation Determine the accuracy of the results obtained by calculating the percent recovery. SHOW WORKINGS BELOW.

Explanation / Answer

1)mass of mixture=1.97g

mass of NH4Cl=0.25 g

%NH4Cl=12.69%

mass of NaCl=0.40 g

%NaCl=20.30%

mass SiO2=1. 34 g

% of SiO2=68.02 %

separation mtds used 1) sublimation , filtration , dissolution

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