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-sentences (hazard and precautionary statements).
  • Ensuring safety of fellow students.
• Order and Cleanliness:
  • Glassware cleaned.
  • Work table and sink cleaned.
  • Proper waste sorting.
  • All materials returned to their correct places.
• Work Ethic:
  • Correct usage of materials.
  • Diligent execution of the experiment.
  • Effective teamwork.
• Behavior:
  • Hair properly arranged.
  • Book bag stowed away properly.
  • No talking with other groups.
• Reflection:

Doel van het Practicum (Goal 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 how to use volumetric laboratory equipment: volumetric flask, pipette, pipette pump, burette.

Oriënteren (Orientation)

• Onderzoeksvraag (Research Question):
  • Determine the concentration of sodium hydroxide by titrating 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 (Equipment):
  • Burette.
  • Retort stand.
  • Burette clamp.
  • 250 mL Erlenmeyer flask.
  • 100 mL graduated cylinder.
  • 10 mL pipette.
  • Funnel.
  • White card for background.
• Stoffen (Substances):
  • Phenolphthalein indicator.
  • Distilled water.
  • NaOH solution (H315-319 P280.1+3-305+351+338).
  • HCl solution 0.10 mol/L (no H- or P-sentences).

Uitvoeren (Execution/Procedure)

• Werkwijze (Method):
  • 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 turns 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.
  • Empty the burette; rinse it by allowing tap water to flow through the full burette.
• Proefopstelling (Experimental Setup):
  • (Create a drawing and label the components)

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