Determining The Formula of a Complex Ion
3/4/14
Determining The Formula of a Complex Ion
Luqman Khan
Contents:
Aim………………………………………………………………………………………………………………….……2
Results……………………………………………………………………………………….………………………2-6
- Raw Data………………………….………….……………………………………………………..…..2
- Qualitative Analysis………………………………………………………………………………….2
- Data Processing……………………………..……………………………………………………..3-5
- Graphical Results……………………………..…………………………………………….…….5-6
Conclusion…………………………………………………………………………………………………………6-7
Evaluation…………………………………………………………………………………………………………….8
Works Cited………………………………………………………………………………………………………….9
Word Count: 1.782
Year 12 Chemistry HL
DUBAI INTERNATIONAL ACADEMY
Aim
The aim of this investigation is to determine the formula of the complex ion formed from copper
(II) ions and ammonia through colorimetry.
Results
Raw Data
Table 1: The Effect of CuSO4:NH3 Volume Ratio (cm³) (±0.05) on Absorbance (±0.01)
Independent Variable:
Volume (cm³) (±0.05)
CuSO4
NH3
0.00
0.00
1.00
9.00
1.50
8.50
2.00
8.00
2.50
7.50
3.00
7.00
4.00
6.00
5.00
5.00
Dependent Variable: Absorbance (±0.01)
Trial 1
0.00
0.14
0.22
0.23
0.10
0.10
0.09
0.07
Trial 2
0.00
0.16
0.22
0.24
0.13
0.13
0.12
0.10
Trial 3
0.00
0.18
0.19
0.24
0.09
0.13
0.10
0.09
Trial 4
0.00
0.17
0.21
0.25
0.14
0.12
0.13
0.12
Trial 5
0.00
0.14
0.18
0.23
0.11
0.09
0.08
0.08
Qualitative Analysis
Table 2: Qualitative Observations and Descriptions
Observation
The solution’s color changes as metal to ligand ratio changes.
Description
I noticed that the solutions’ colors turned darker as the CuSO4 volume increased in the ratio with NH3, until a point was reached beyond which further increases in CuSO4 volume in proportion to NH3 volume made the solution’s color lighter. From transparent (0:0), it gradually changed to blue, darker blue, violet, and dark navy blue (2:8), before the solutions started to turn into ligher shades of sky blue.
2
Data
Determining The Formula of a Complex Ion
Luqman Khan
Contents:
Aim………………………………………………………………………………………………………………….……2
Results……………………………………………………………………………………….………………………2-6
- Raw Data………………………….………….……………………………………………………..…..2
- Qualitative Analysis………………………………………………………………………………….2
- Data Processing……………………………..……………………………………………………..3-5
- Graphical Results……………………………..…………………………………………….…….5-6
Conclusion…………………………………………………………………………………………………………6-7
Evaluation…………………………………………………………………………………………………………….8
Works Cited………………………………………………………………………………………………………….9
Word Count: 1.782
Year 12 Chemistry HL
DUBAI INTERNATIONAL ACADEMY
Aim
The aim of this investigation is to determine the formula of the complex ion formed from copper
(II) ions and ammonia through colorimetry.
Results
Raw Data
Table 1: The Effect of CuSO4:NH3 Volume Ratio (cm³) (±0.05) on Absorbance (±0.01)
Independent Variable:
Volume (cm³) (±0.05)
CuSO4
NH3
0.00
0.00
1.00
9.00
1.50
8.50
2.00
8.00
2.50
7.50
3.00
7.00
4.00
6.00
5.00
5.00
Dependent Variable: Absorbance (±0.01)
Trial 1
0.00
0.14
0.22
0.23
0.10
0.10
0.09
0.07
Trial 2
0.00
0.16
0.22
0.24
0.13
0.13
0.12
0.10
Trial 3
0.00
0.18
0.19
0.24
0.09
0.13
0.10
0.09
Trial 4
0.00
0.17
0.21
0.25
0.14
0.12
0.13
0.12
Trial 5
0.00
0.14
0.18
0.23
0.11
0.09
0.08
0.08
Qualitative Analysis
Table 2: Qualitative Observations and Descriptions
Observation
The solution’s color changes as metal to ligand ratio changes.
Description
I noticed that the solutions’ colors turned darker as the CuSO4 volume increased in the ratio with NH3, until a point was reached beyond which further increases in CuSO4 volume in proportion to NH3 volume made the solution’s color lighter. From transparent (0:0), it gradually changed to blue, darker blue, violet, and dark navy blue (2:8), before the solutions started to turn into ligher shades of sky blue.
2
Data
Cited: "Colorimetry." Docbrown.info. N.p., n.d. Web. 02 Apr. 2014. . "Introducing Complex Ions - Ligands and Bonding." Chemgiude.co.uk. N.p., n.d. Web. 02 Apr. 2014. . 9