NaOH Titration Vocabulary

Onderzoekspracticum: Bepaling van NaOH-concentratie mbv Titratie

Attitudes (Attitudes during the experiment)

• Veiligheid (Safety):
  • Lab coat on and closed?
  • Safety of fellow students?
  • Safety glasses on?
• Orde en netheid (Order and Cleanliness):
  • Glassware cleaned?
  • Hair in order?
  • Book bag stowed?
  • Table and sink cleaned?
  • Waste sorted?
  • Everything back in its proper place?
• Werk (Work Ethic):
  • Use of material?
  • Execution of experiment?
  • Smooth collaboration?
• Gedrag (Behavior):
  • Attention to P- and H-phrases (precautionary and hazard statements)?
  • Talking with other groups?
• Conclusie (Conclusion):
  • Reflection on the experiment.

Doel van het practicum (Objective of the Experiment)

• Determination of the concentration of sodium hydroxide by titration with a standardized 0.10 mol/L HCl solution.
• Learning to use volumetric equipment: volumetric flask, pipette, pipette pump, burette.

Oriënteren - Onderzoeksvraag (Orientation - Research Question)

• Onderzoeksprobleem (Research Problem): Determine the concentration of sodium hydroxide by titration with a standardized 0.10 mol/L HCl solution.
• The NaOH solution is provided.

Onderzoeksvragen (Research Questions)

Voorbereiden (Preparation)

A - Informatie verzamelen = vooronderzoek (Gathering Information = Preliminary Research)

• Principle of titration and of acid-base indicators.

B Benodigdheden (Materials)

• Materiaal (Materials): burette, stand, burette clamp, 250 mL Erlenmeyer flask, 100 mL graduated cylinder, 10 mL pipette, funnel, white card as background.
• Stoffen (Substances):
  • Phenolphthalein, distilled water
  • NaOH solution H 315-319 P 280.1+3-305+351+338
    • H 315-319: Hazard statements indicating skin and eye irritation.
    • P 280.1+3-305+351+338: Precautionary statements regarding protective measures and first aid.
  • HCl solution 0.10 mol/L – no H- and P-phrases (no hazard or precautionary statements).

Uitvoeren Werkwijze (Procedure)

• Pipette exactly 10 mL of NaOH solution into an Erlenmeyer flask, add a few drops of phenolphthalein, and homogenize (mix).
• Fill the burette with the 0.10 mol/L HCl solution.
• Record the initial reading of the HCl solution in the burette.
• Titrate until colorless.
• Record the final reading of the HCl solution in the burette.
• Perform the titration at least three times and calculate the average added volume.
• Let the burette drain completely. Rinse by letting a full burette of tap water drain through.
• Proefopstelling (maak een tekening en benoem de onderdelen) - Experimental setup (make a drawing and name the parts)

Meetgegevens (Measurements)

Berekeningen (Calculations)

• Calculate the concentration of NaOH in the solution expressed in mol/L.
• Calculate the concentration of NaOH in the solution expressed in m/V%.

Rapporteren - Reflecteren (Reporting - Reflection)

Evalueren uitvoering (Evaluate performance)

• Does the calculated concentration correspond to the value stated on the label? If not, what could be the reason for this?