Experiment on Identifying Unknown Solution

Objective

• Determine the identity of an unknown solution by conducting trials mixing it with sodium hypochlorite in differing stoichiometric ratios.

Methodology

• Three initial trials conducted by mixing:
  • Sodium hypochlorite and unknown solution in ratios:
    • 1:1
    • 3:1
    • 4:1
• Procedure:
  • Start with a specific volume of unknown solution.
  • Add bleach (sodium hypochlorite) in one of the stoichiometric ratios.
  • Observe and record the temperature change.

Experiment Details

• Trial 1 (Experiment 2):

  • Unknown: 2.5 mL
  • Bleach: 7.5 mL
  • Objective to achieve one of the ideal stoichiometric ratios.

• Trial 2:

  • Bleach: 8 mL
  • Unknown: 2 mL
  • Check for highest temperature change.

• Observation:

  • Monitor the temperature rise to determine the maximum temperature.
  • Calculate the temperature change by subtracting initial temperature from the highest temperature reached.

Additional Trials

• Conducted 8 more trials to confirm the identity of the unknown solution.
  • 4 trials above the suspected ratio.
  • 4 trials below the suspected ratio.

Data Handling

• Copy results of trials onto personal report form.
• Download calculation guide from Learning Suite.
• Create a graph with this data using software such as Excel.

Additional Resources

• For assistance with graphing, watch "Experiment 2 Calculations" video on Rebecca Sansom's YouTube channel.

Final Steps

• After graph creation, finalize and submit the experiment report.