Answer to Question #65131 in Chemistry for Harleen Brar

Question

In a study of the poisoning of fish, 0.500 g of samples of fish tissue were analysed for barium. Each sample was digested with a permanganate-sulfuric acid mixture, and the volume adjusted to 10 mL and to construct calibration curve, 0.500-g samples of uncontaminated fish tissue were injected with various amounts of Ba+2, as follows:

Standard 0: 0.00µg Ba+2
Standard 1: 50 µg Ba+2
Standard 2: 100 µg Ba+2
Standard 3: 150 µg Ba+2

The absorbance values are indicated below:

Standard Number 0; Absorbance 0.015
Standard Number 1; Absorbance 0.220
Standard Number 2; Absorbance 0.415
Standard Number 3; Absorbance 0.602


If all samples and standards were treated in identical manner, what was the concentration of barium (in µg Ba per g of fish) in a fish sample whose absorbance value was 0.421 and 0.378, respectively?

Answer 1

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