Chemical Principles in the Laboratory
11th Edition
ISBN:9781305264434
Author:Emil Slowinski, Wayne C. Wolsey, Robert Rossi
Publisher:Emil Slowinski, Wayne C. Wolsey, Robert Rossi
Chapter27: Relative Stabilities Of Complex Ions And Precipitates Prepared From Solutions Of Copper(ii)
Section: Chapter Questions
Problem 1ASA
Related questions
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'.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fe75b28d5-91e8-459e-9769-938bdd59bd5a%2F129559af-01ba-469f-b1ba-b4b3c345fc5c%2F4c3lw08_processed.jpeg&w=3840&q=75)
Transcribed Image Text: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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