water sample is determined through aspectrophotometric method based on the reaction of phosphate ion with molybdate ion, byoriginating a yellow complex. Calibration standards (P1 to P5) are prepared as follows:different volumes of a 102.2 mgL1 phosphate solution are added to several 100 mL volumetric1.The content of phosphate inaflasks. Then, 10 mL of diluted HCI, 10 mL of 1% molybdate ion solution, and 10 mL of 0.75%oxalic acid solution are added to every flask, and finally water is added up to the volumetricmark. Samples are prepared in the same way, adding different sample volumes instead ofphosphate standard solution. Absorbance of all solutions is measured at 360 nm, and thefollowing data are obtained:Added volumeAbsorbance at 360 nmP12a0.109P25a0.249P310a0.501P415a0.748Р520a1.008Blank0.000Sample20b0.624(a) mL of 102.2 mg L' phosphate standard solution. (b) mL of sampleCalculate the concentration of phosphate in the water sample expressed in mg L'.

Concentration of Phosphate standard solution = 102.2 mg/L Volume of each standard solution = 100 mL…

Answered: Calculate the concentration of…

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Calculate the concentration of phosphate in the water sample expressed in mg L1.

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Concept explainers

Group 13 Elements

In the periodic table, group 13 elements exist in the first p-block. There are six elements present in group 13, which include boron (B), aluminum (Al), gallium (Ga), indium (In), thallium (Tl), and element 113 (ununtrium, (Uut)). Group 13 elements are also designated as the boron family.

Question

water sample is determined through a
spectrophotometric method based on the reaction of phosphate ion with molybdate ion, by
originating a yellow complex. Calibration standards (P1 to P5) are prepared as follows:
different volumes of a 102.2 mgL1 phosphate solution are added to several 100 mL volumetric
1.
The content of phosphate in
a
flasks. Then, 10 mL of diluted HCI, 10 mL of 1% molybdate ion solution, and 10 mL of 0.75%
oxalic acid solution are added to every flask, and finally water is added up to the volumetric
mark. Samples are prepared in the same way, adding different sample volumes instead of
phosphate standard solution. Absorbance of all solutions is measured at 360 nm, and the
following data are obtained:
Added volume
Absorbance at 360 nm
P1
2a
0.109
P2
5a
0.249
P3
10a
0.501
P4
15a
0.748
Р5
20a
1.008
Blank
0.000
Sample
20b
0.624
(a) mL of 102.2 mg L' phosphate standard solution. (b) mL of sample
Calculate the concentration of phosphate in the water sample expressed in mg L'.

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