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# Calcium in flour was analyzed by the following procedure. First; 0.1490 g of flour were dissolved by microwave digestion in 8 mL concentrated nitric acid + 2 mL 30%...

## Question

###### Calcium in flour was analyzed by the following procedure. First; 0.1490 g of flour were dissolved by microwave digestion in 8 mL concentrated nitric acid + 2 mL 30% hydrogen peroxide The resulting solution was transferred to a 100.0 mL volumetric flask and diluted to the line with deionized water. From this, 20.00 mL were pipetted into each of four separate 50-mL volumetric flasks To these were added 0, 5.00, 10.00 and 15.00 mL of 8.17 mg/L calcium standard solution before diluting to the line w

Calcium in flour was analyzed by the following procedure. First; 0.1490 g of flour were dissolved by microwave digestion in 8 mL concentrated nitric acid + 2 mL 30% hydrogen peroxide The resulting solution was transferred to a 100.0 mL volumetric flask and diluted to the line with deionized water. From this, 20.00 mL were pipetted into each of four separate 50-mL volumetric flasks To these were added 0, 5.00, 10.00 and 15.00 mL of 8.17 mg/L calcium standard solution before diluting to the line with deionized water and mixing well. Atomic absorption of calcium was measured for all four of the resulting solutions, giving the data shown below: A blank measurement gave an absorption of zero_ Description of solution Atomic absorption Unspiked solution (50.00 mL) 0.125 Spiked with 5.00 mL 8.17 mgL Ca 0.246 Spiked with 10.00 mL 8.17 mgJL Ca 0.368 Spiked with 15.00 mL 8.17 mg/L Ca 0.490 What was the calcium content of the flour in mg/g (parts per thousand)? (Hint: remember to take dilution into account Use only the unspiked solution and the 5.00 mL spiked solution from the previous question with the single-spike method of standard additions to calculate the concentration of the unknown_  #### Similar Solved Questions

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