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)

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?