Titration Vocabulary

Onderzoekspracticum: Bepaling van NaOH-concentratie mbv Titratie

Attitudes (Attitudes observed during the experiment)

  • Veiligheid:
    • Lab coat worn and fastened?
    • Safety of fellow students considered?
    • Safety glasses worn?
    • Awareness of P- and H- sentences?
  • Order and Neatness:
    • Glassware cleaned?
    • Hair tied back?
    • Bag stored away?
    • Table and sink cleaned?
    • Waste sorted correctly?
    • Everything returned to its proper place?
  • Work Ethic:
    • Proper use of materials?
    • Execution of the experiment?
    • Smooth collaboration?
    • No talking with other groups?
  • Reflection:
    • Conclusion?
    • Reflection on the experiment?

Doel van het Practicum (Goal of the experiment)

  • Determine the concentration of sodium hydroxide (NaOH) through titration with a standardized 0.10 mol/L HCl solution.
  • Learn to handle volumetric equipment: volumetric flask, pipette, pipette pump, burette.

Oriënteren (Orientation)

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

Voorbereiden (Preparation)

A - Informatie verzamelen = vooronderzoek (Gathering information = preliminary research)

  • Principle of titration and acid-base indicators.

B - Benodigdheden (Materials Required)

  • Materiaal (Materials):
    • Burette
    • Stand
    • Burette clamp
    • 250 mL Erlenmeyer flask
    • 100 mL graduated cylinder
    • 10 mL pipette
    • Funnel
    • White card (for background)
  • Stoffen (Chemicals):
    • Phenolphthalein indicator
    • Distilled water
    • NaOH solution (H315-319 P280.1+3-305+351+338)
    • HCl solution 0.10 mol/L (no H- or P-statements)

Uitvoeren (Execution)

Werkwijze (Procedure)

  1. Using a pipette, transfer exactly 10 mL of the NaOH solution into an Erlenmeyer flask. Add a few drops of phenolphthalein and homogenize (mix).
  2. Fill the burette with the 0.10 mol/L HCl solution.
  3. Record the initial burette reading of the HCl solution.
  4. Titrate until the solution turns colorless.
  5. Record the final burette reading of the HCl solution.
  6. Perform the titration at least three times and calculate the average volume of HCl added.
  7. Drain the burette. Rinse by allowing a full burette of tap water to drain through.

Proefopstelling (Experimental Setup)

  • (Drawing of the setup with labeled components)

Meetgegevens (Measurements)

Titratie 1Titratie 2Titratie 3Gemiddeld toegevoegd volume (mL)
Beginstand buret (mL)
Eindstand buret (mL)
Toegevoegd volume (mL)

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 (Evaluating Execution)

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