Cu Absorbance Absorbance Absorbance Mean ± SD standard 1 2 3 (рpm) 1 0.0521 0.0520 0.0522 0.0521 + 0.0001 2 0.1011 0.1012 0.1013 0.1012 + 0.0001 3 0.1576 0.1578 0.1577 0.1577 + 0.0001 4 0.2119 0.2120 0.2121 0.212 + 0.0001 5 0.2688 0.2681 0.2685 0.268466667 ± 0.003032 Unknown Absorbance Absorbance Absorbance Mean + SD sample 1 2 3 Water 0.1649 0.1648 0.1701 0.1666 + 0.003032 sample 1 (1:10 dilution) Cr Absorbance Absorbance 2 Absorbance 3 Mean + SD standard (рpm) 1 0.0419 0.0425 0.0420 0.042133333 + 0.000321 2 0.0778 0.0780 0.0779 0.0779 + 0.0001 3 0.1040 0.1043 0.1041 0.104133333 ± 0.000153 4 0.1368 0.1369 0.1372 0.136966667 ± 0.000208 5 0.1646 0.1647 0.1649 0.164733333 + 0.000153 Unknown Absorbance Absorbance 2 Absorbance 3 Mean + SD sample Tap Water sample 1 (1:20 dilution) 1 0.0488 0.0489 0.0501 0.049266667 + 0.000723

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Construct and evaluate the calibration curve by plotting absorbance versus concentration.

Cu
Absorbance Absorbance
Absorbance
Mean + SD
standard
1
2
3
(ppm)
1
0.0521
0.0520
0.0522
0.0521 + 0.0001
2
0.1011
0.1012
0.1013
0.1012 + 0.0001
3
0.1576
0.1578
0.1577
0.1577 + 0.0001
4
0.2119
0.2120
0.2121
0.212 + 0.0001
5
0.2688
0.2681
0.2685
0.268466667 ± 0.003032
Unknown
Absorbance Absorbance Absorbance
Mean + SD
sample
2
3
Water
0.1649
0.1648
0.1701
0.1666 + 0.003032
sample 1
(1:10
dilution)
Cr
Absorbance
Absorbance 2 Absorbance 3
Mean + SD
standard
1
(ppm)
1
0.0419
0.0425
0.0420
0.042133333 ± 0.000321
0.0778
0.0780
0.0779
0.0779 +0.0001
3
0.1040
0.1043
0.1041
0.104133333 ± 0.000153
4
0.1368
0.1369
0.1372
0.136966667 ± 0.000208
5
0.1646
0.1647
0.1649
0.164733333 + 0.000153
Unknown
Absorbance
Absorbance 2 Absorbance 3
Mean + SD
sample
Tap Water
sample 1
(1:20
dilution)
1
0.0488
0.0489
0.0501
0.049266667 ± 0.000723
Transcribed Image Text:Cu Absorbance Absorbance Absorbance Mean + SD standard 1 2 3 (ppm) 1 0.0521 0.0520 0.0522 0.0521 + 0.0001 2 0.1011 0.1012 0.1013 0.1012 + 0.0001 3 0.1576 0.1578 0.1577 0.1577 + 0.0001 4 0.2119 0.2120 0.2121 0.212 + 0.0001 5 0.2688 0.2681 0.2685 0.268466667 ± 0.003032 Unknown Absorbance Absorbance Absorbance Mean + SD sample 2 3 Water 0.1649 0.1648 0.1701 0.1666 + 0.003032 sample 1 (1:10 dilution) Cr Absorbance Absorbance 2 Absorbance 3 Mean + SD standard 1 (ppm) 1 0.0419 0.0425 0.0420 0.042133333 ± 0.000321 0.0778 0.0780 0.0779 0.0779 +0.0001 3 0.1040 0.1043 0.1041 0.104133333 ± 0.000153 4 0.1368 0.1369 0.1372 0.136966667 ± 0.000208 5 0.1646 0.1647 0.1649 0.164733333 + 0.000153 Unknown Absorbance Absorbance 2 Absorbance 3 Mean + SD sample Tap Water sample 1 (1:20 dilution) 1 0.0488 0.0489 0.0501 0.049266667 ± 0.000723
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