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Calibration Of Part B And C Different Solubility Solutions

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During the experiment for part B and C different volumes of copper (II) sulfate, sodium hydroxide, and sodium sulfate were added to the test tubes to produce solution with different pH, absorbances, and precipitates. The equation for the calibration curve was y=3.5067x + 0.0155 and was used in part B of the calculations. The average Ksp calculated for the Solubility Solutions was -7.12x10-13 and the average Ksp calculated for Cu(OH)2 was 5.04x10-7. The differences between the two Ksp were due to the different solvent use part B and C because the reactions impacted on solubility. The average Ksp for the Solubility Solutions should not have been negative, but because the equilibrium concentration of Cu+ for Solution 1 was -0.00356, this causes the Ksp of Cu(OH)2 for Solution 1 to be negative, and the overall average to be negative. This error was caused by the Solution 1 absorbance being very low, lower than the b value in the equation. It is impossible to have a negative concentration. Two errors that could have lead to invalid data were not rinsing the pH meter between readings, this would have messed up the pH of each solution, and not blanking the spectrophotometer before taking the absorbance of the …show more content…
An error that is out of our control was the calibration of the pH meter because it was calibrated at two different pH levels before the lab and if they calibrations were off, then the readings for the entire lab were

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