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 1
Titratie 2
Titratie 3
Gemiddeld 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%.