NaOH Concentration Determination via Titration

Onderzoekspracticum: Bepaling van NaOH-concentratie mbv Titratie

Attitudes (Attitudes)

• Veiligheid (Safety)
  • Lab coat on and closed?
  • Safety glasses on?
  • Attention to H- and P-phrases (Hazard and Precautionary statements)?
  • Safety of fellow students?
• Orde en netheid (Order and Cleanliness)
  • Glassware cleaned?
  • Hair in order?
  • Desk and sink cleaned?
  • Waste sorted?
• Werk (Work)
  • Use of material?
  • Bag?
  • Implementation?
  • Smooth collaboration?
  • Everything back in its place?
• Gedrag (Behavior)
  • Conclusion?
  • Talking with other groups?
  • Reflection?

Doel van het practicum (Purpose of the Practicum)

• Determination of the concentration of sodium hydroxide by titration with a standard HCl solution of 0.10 mol/L.
• Learning to handle volumetric material: volumetric flask, pipette, pipette pump, burette.

Oriënteren - onderzoeksvraag (Orientation - Research Question)

• Onderzoeksprobleem (Research problem)
  • Determine the concentration of sodium hydroxide by titration with a standard HCl solution of 0.10 mol/L. The NaOH solution is provided.
• Onderzoeksvragen (Research questions)

Voorbereiden (Preparation)

A - Informatie verzamelen = vooronderzoek (Gathering Information = Preliminary Investigation)

• Principle of titration and of acid-base indicators.

B Benodigdheden (Necessities)

• Materiaal (Material):
  • Burette
  • Stand
  • Burette clamp
  • Erlenmeyer flask of 250 mL
  • Graduated cylinder of 100 mL
  • Pipette of 10 mL
  • Funnel
  • White card as background
• Stoffen (Substances):
  • Phenolphthalein, distilled water
  • NaOH solution H 315-319 P 280.1+3-305+351+338
  • HCl solution 0.10 mol/L – no H- and P-phrases

Uitvoeren (Execution)

Werkwijze (Method)

1. Transfer exactly 10 mL of the NaOH solution into an Erlenmeyer flask using a pipette, add a few drops of phenolphthalein, and homogenize.
2. Fill the burette with the 0.10 mol/L HCl solution.
3. Record the initial reading of the HCl solution in the burette.
4. Titrate until colorless.
5. Record the final reading of the HCl solution in the burette.
6. Perform the titration preferably three times and calculate the average added volume.
7. Let the burette drain. Rinse by letting a full burette of tap water drain through.

• Proefopstelling (maak een tekening en benoem de onderdelen) - Experimental setup (make a drawing and name 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 - Reflecting)

Evalueren uitvoering (Evaluate Implementation)

• Does the calculated concentration correspond to the value stated on the label? If not, what could this be due to? Calculation errors, inaccurate titrations, or issues with the HCl or NaOH solutions.