Three unknown solutions were prepared by pipetting 15.00 mL of an unknown nickel solution into a 200.00 mL volumetric flask and diluting to the mark. Then three samples were prepared from this dilute unknown solution by pipetting 5.00 mL of the dilute solution into a 25.00 mL flask, to which the reagents were added then it was diluted to the mark. UV Spectroscopy analyzed the resulting solutions and the unknown absorbance value were converted to concentration by means of a calibration curve, Table 4-1. Fill in the diagram with appropriate volumes. Determine the concentration of the original nickel solution, in ppm Ni, from each of the three unknown solutions and an average. Included appropriate error calculations. Show complete calculations using Trial 1 data. Present results for all trials and the average with uncertainties.

Question

Three unknown solutions were prepared by pipetting 15.00 mL of an unknown nickel solution into a 200.00 mL volumetric flask and diluting to the mark. Then three samples were prepared from this dilute unknown solution by pipetting 5.00 mL of the dilute solution into a 25.00 mL flask, to which the reagents were added then it was diluted to the mark. UV Spectroscopy analyzed the resulting solutions and the unknown absorbance value were converted to concentration by means of a calibration curve, Table 4-1. Fill in the diagram with appropriate volumes. Determine the concentration of the original nickel solution, in ppm Ni, from each of the three unknown solutions and an average. Included appropriate error calculations. Show complete calculations using Trial 1 data. Present results for all trials and the average with uncertainties.

Unknown Trial
Trial 1 2.76885 ± 0.15252
Trial 2 3.23552 ± 0.16264
Trial 3 3.35263 ± 0.16485

Answer 1

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Answer 2

To determine the concentration of the original nickel solution, you need to follow the given steps and use the provided data:

Step 1: Calculate the concentration of the dilute unknown solution using the calibration curve from Table 4-1.
- Refer to Table 4-1 to find the corresponding concentration (in ppm Ni) for each absorbance value.
- For Trial 1, the absorbance value is 2.76885 ± 0.15252. Use this value to find the concentration from the calibration curve.

Step 2: Calculate the concentration of the original nickel solution from the dilute unknown solution.
- Use the dilution formula to calculate the concentration of the original solution.
- The dilution factor can be determined by comparing the volumes of the dilute unknown solution and the original nickel solution used.
- In this case, 15.00 mL of the unknown nickel solution was diluted to 200.00 mL, so the dilution factor is (200.00 mL / 15.00 mL).

Step 3: Calculate the uncertainties and average concentration.
- Calculate the uncertainties for each trial using the given uncertainties for absorbance.
- Average the concentrations obtained from the three trials.

Let's apply these steps to Trial 1 and then you can follow the same steps for Trials 2 and 3.

Step 1: Calculate the concentration of the dilute unknown solution using the calibration curve.
- Refer to Table 4-1 and find the concentration corresponding to the absorbance value of 2.76885.
- Suppose the corresponding concentration is x ppm Ni.

Step 2: Calculate the concentration of the original nickel solution.
- The dilution factor is (200.00 mL / 15.00 mL), which is 13.33.
- The concentration of the original nickel solution is (x ppm Ni) * 13.33.

Step 3: Calculate the uncertainties and average concentration.
- The uncertainty for the absorbance value of 2.76885 is 0.15252.
- To calculate the uncertainty for the concentration of the original nickel solution, use error propagation. Multiply the relative uncertainty of the absorbance by the dilution factor.
- The uncertainty for the concentration of the original nickel solution is (0.15252 * 13.33).

Repeat the same steps for Trials 2 and 3 to calculate the concentrations of the original nickel solution for each trial.

Finally, average the concentrations obtained from all three trials, and calculate the uncertainties using error propagation.

Note: It is important to understand the specifics of the calibration curve and the calculation method to accurately interpret and calculate the results. The information provided will allow you to perform the calculations.