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NaOH Titration Flashcards

Onderzoekspracticum: Bepaling van NaOH-concentratie mbv Titratie

Attitudes

  • Veiligheid:
    • Lab coat worn and closed properly.
    • Safety glasses worn.
    • Awareness of P- and H-phrases.
    • Safety of fellow students.
  • Order and tidiness:
    • Glassware cleaned.
    • Work table and sink cleaned.
    • Waste sorted properly.
    • All materials returned to the correct place.
  • Work Ethic:
    • Proper use of materials.
    • Execution of procedure.
    • Smooth collaboration.
    • No talking with other groups.
  • Behavior:
    • Hair properly arranged.
    • Book bag stored away.

Doel van het Practicum (Objective of the Practicum)

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

Oriënteren (Orientation)

  • Onderzoeksvraag (Research Question): Determine the concentration of sodium hydroxide by titration with a standardized 0.10 mol/L HCl solution. 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 (background)
  • Stoffen (Chemicals):
    • Phenolphthalein
    • Distilled water
    • NaOH solution (H315-319 P280.1+3-305+351+338)
    • HCl solution 0.10 mol/L (no H- and P-phrases)

Uitvoeren (Execution)

Werkwijze (Procedure)

  • Transfer exactly 10 mL of the NaOH solution into an Erlenmeyer flask using a pipette; add a few drops of phenolphthalein and homogenize.
  • Fill the burette with the 0.10 mol/L HCl solution.
  • Record the initial burette reading of the HCl solution.
  • Titrate until the solution becomes colorless.
  • Record the final burette reading of the HCl solution.
  • Perform the titration at least three times and calculate the average volume added.
  • Drain the burette completely. Rinse by allowing a full burette of tap water to drain through.
  • Proefopstelling (Experimental setup): Make a drawing and label the parts.

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 correspond with the value stated on the label? If not, what could be the reasons for this?