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0.0123 g of the powder from the tablet ( 1.4770g) was transferred to a 100 mL volumetric flask. 20 mL of 1M hydrochloric acid was added to the flask. The volume in the flask was then made up to the mark with deionized water which was filtered. 40 mL of the filtrate and 4 mL of a lanthanum chloride solution were placed into a large test tube. Half of the prepared sample was spiked with a 20 mg/L calcium standard. The calibration standards and the unknown sample solutions were then measured for calcium concentration at 422.7 nm with flame atomic absorption spectroscopy. Each tablet is stated by the manufacturer to contain 500 mg of calcium. Sample ID Absorbance Blank 0.039 Reagent Blank 0.194 Sample 0.855 Spiked sample 1.184 Calibration curve: y = 0.0184x + 0.007; r2 = 0.991 Calculate the spike recovery for the calcium analysis.

0.0123 g of the powder from the tablet ( 1.4770g) was transferred to a 100 mL volumetric flask. 20 mL of 1M hydrochloric acid was added to the flask. The volume in the flask was then made up to the mark with deionized water which was filtered. 40 mL of the filtrate and 4 mL of a lanthanum chloride solution were placed into a large test tube. Half of the prepared sample was spiked with a 20 mg/L calcium standard. The calibration standards and the unknown sample solutions were then measured for calcium concentration at 422.7 nm with flame atomic absorption spectroscopy. Each tablet is stated by the manufacturer to contain 500 mg of calcium. Sample ID Absorbance Blank 0.039 Reagent Blank 0.194 Sample 0.855 Spiked sample 1.184 Calibration curve: y = 0.0184x + 0.007; r2 = 0.991 Calculate the spike recovery for the calcium analysis.

Chemistry for Engineering Students
Chemistry for Engineering Students
4th Edition
ISBN:9781337398909
Author:Lawrence S. Brown, Tom Holme
Publisher:Lawrence S. Brown, Tom Holme
Chapter4: Stoichiometry
Section: Chapter Questions
Problem 4.98PAE
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0.0123 g of the powder from the tablet ( 1.4770g) was  transferred to a 100 mL volumetric flask. 20 mL of 1M hydrochloric acid was added to the flask. The volume in the flask was then made up to the mark with deionized water which was filtered. 40 mL of the filtrate and 4 mL of a lanthanum chloride solution were placed into a large test tube. Half of the prepared sample was  spiked with a 20 mg/L calcium standard. The calibration standards and the unknown sample solutions were then measured for calcium concentration at 422.7 nm with flame atomic absorption spectroscopy. 

Each tablet is stated by the manufacturer to contain 500 mg of calcium.

 

Sample ID         Absorbance

Blank                 0.039
Reagent Blank   0.194
Sample              0.855
Spiked sample   1.184
Calibration curve: y = 0.0184x + 0.007; r2 = 0.991

 

Calculate the spike recovery for the calcium analysis. 

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