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NaOH Titration Vocabulary

Onderzoekspracticum: Bepaling van NaOH-concentratie mbv Titratie

Attitudes

  • Veiligheid:
    • Labcoat should be worn and closed.
    • Safety glasses should be worn.
    • Consideration for the safety of fellow students.
    • Awareness of P and H phrases.
  • Order and Cleanliness:
    • Glassware cleaned.
    • Hair in order.
    • Bag placement.
    • Table and sink cleaned.
    • Waste sorted correctly.
    • Everything returned to its proper place.
  • Work Ethic:
    • Proper use of materials.
    • Smooth collaboration.
    • No talking with other groups.
  • Conclusion: Reflection on the experiment.

Doel van het Practicum (Objective of the Practicum)

  • Determine the concentration of sodium hydroxide (NaOH) through titration with a standardized hydrochloric acid (HCl) solution of 0.10 mol/L.
  • Learn to handle 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 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.
    • Retort stand.
    • Burette clamp.
    • 250 mL Erlenmeyer flask.
    • 100 mL graduated cylinder.
    • 10 mL pipette.
    • Funnel.
    • White card for background.
  • Stoffen (Chemicals):
    • Phenolphthalein.
    • Distilled water.
    • NaOH solution (H315-319 P280.1+3-305+351+338).
    • HCl solution 0.10 mol/L (no H- or P-phrases indicated).

Uitvoeren (Execution)

Werkwijze (Procedure)

  • Using a pipette, transfer exactly 10 mL of the 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 the solution becomes colorless.
  • Record the final reading of the HCl solution in the burette.
  • Perform the titration at least three times and calculate the average volume of HCl added.
  • Let the burette drain. Rinse by letting a full burette of tap water drain through.
  • Proefopstelling (Experimental setup; Create a drawing and label the components)

Meetgegevens (Measurements)

Titratie 1Titratie 2Titratie 3Gemiddeld toegevoegd volume (mL)
Beginstand buret (mL)
Eindstand buret (mL)
Toegevoegd volume 0.10 mol/L HCl (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 match the value on the label? If not, what could be the reasons for the discrepancy? Possible errors or deviations during the experiment.