NaOH Titration Flashcards

Onderzoekspracticum: Bepaling van NaOH-concentratie mbv Titratie

Attitudes

• Veiligheid:
  • Lab coat worn and closed?
  • Safety of fellow students considered?
  • Safety glasses worn?
  • Awareness of H- and P-sentences (Hazard and Precautionary statements)?
• Order and Cleanliness:
  • Glassware cleaned?
  • Hair properly arranged?
  • Schoolbag properly stored?
  • Table and sink cleaned?
  • Waste sorted properly?
• Work Ethic:
  • Proper use of materials?
  • Everything returned to its proper place?
• Behavior:
  • Smooth collaboration?
  • No talking with other groups?
• Reflection:

Doel van het Practicum (Purpose of the Practical)

• Determine the concentration of sodium hydroxide (NaOH) through titration with a standardized hydrochloric acid (HCl) solution (0.10 mol/L).
• Learn to work with volumetric equipment:
  • Volumetric flask (maatkolf)
  • Pipette
  • Pipette pump
  • Burette

Oriënteren - Onderzoeksvraag (Orientation - Research Question)

• Onderzoeksprobleem (Research Problem): Determine the concentration of NaOH by titration with a standardized HCl solution (0.10 mol/L). The NaOH solution is provided.
• Onderzoeksvragen (Research Questions):

Voorbereiden (Preparation)

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

• Principle of titration.
• Principle of acid-base indicators.

B - Benodigdheden (Materials)

• Materiaal (Equipment):
  • Burette
  • Stand (Statief)
  • Burette clamp (buretklem)
  • Erlenmeyer flask (250 mL)
  • Graduated cylinder (100 mL) (Maatcilinder)
  • Pipette (10 mL)
  • Funnel (Trechter)
  • White card (for background)
• Stoffen (Substances):
  • Phenolphthalein
  • Distilled water
  • NaOH solution
    • H315-319: Causes skin irritation. Causes serious eye irritation.
    • P280.1+3-305+351+338: Wear protective gloves/protective clothing/eye protection/face protection. IF ON SKIN: Wash with plenty of water. IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
  • HCl solution (0.10 mol/L) – No H- or P-sentences provided (meaning it's considered less hazardous at this concentration).

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 indicator and mix to homogenize.
  • 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.
  • Let the burette drain completely. Rinse by letting a full burette of tap water drain through.
• Proefopstelling (Experimental Setup):
  • (Drawing and labeling of the setup - burette, stand, Erlenmeyer flask, etc.)

Meetgegevens (Measurements)

• Table for recording data:
  • Beginstand buret (mL) [Initial burette reading (mL)]
  • Eindstand buret (mL) [Final burette reading (mL)]
  • Toegevoegd volume 0,10 mol/L HCl (mL) [Volume of 0.10 mol/L HCl added (mL)]
  • Titratie 1, Titratie 2, Titratie 3 (Titration 1, Titration 2, Titration 3)
  • Gemiddeld toegevoegd volume (mL) [Average volume added (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% (mass/volume percentage).

Rapporteren - Reflecteren (Reporting - Reflection)

Evalueren uitvoering (Evaluate Execution)

• Does the calculated concentration match the value on the label? If not, what could be the reasons for the discrepancy? (e.g., inaccurate standardization of HCl, errors in volume measurement, NaOH degradation, etc.)