3. Suppose that you do an AA spectroscopic analysis for Ca2+ in yogurt. 1.5 g of yogurt is digested with 20.0 mL of HNO3 for ~ 10 minutes. The mixture is filtered into a 100 mL volumetric flask and diluted to the line with water to make Solution A. Then, two successive dilution are made:
10 mL of Solution A is added to another 100 mL volumetric flask and diluted with water to the mark to make Solution B.
10 mL of Solution B is added to another 100 mL volumetric flask and diluted with water to the mark to make Solution C.
When solution C is analyzed using AA spectroscopy, it is found to have a concentration of 0.215 ppm Ca2+.
a. What is the dilution factor?
b. What is the concentration of Ca2+ (ppm) in Solution A?
c. How many g of Ca are in the original 1.5 g of yogurt?
d. What is the %Ca (w/w) in the yogurt?
3. Suppose that you do an AA spectroscopic analysis for Ca2+ in yogurt. 1.5 g of yogurt is digested with 20.0 mL of HNO3 for ~ 10 minutes. The mixture is filtered into a 100 mL volumetric flask and diluted to the line with water to make Solution A. Then, two successive dilution are made:
10 mL of Solution A is added to another 100 mL volumetric flask and diluted with water to the mark to make Solution B.
10 mL of Solution B is added to another 100 mL volumetric flask and diluted with water to the mark to make Solution C.
When solution C is analyzed using AA spectroscopy, it is found to have a concentration of 0.215 ppm Ca2+.
a. What is the dilution factor?
b. What is the concentration of Ca2+ (ppm) in Solution A?
c. How many g of Ca are in the original 1.5 g of yogurt?
d. What is the %Ca (w/w) in the yogurt?
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