Rücktitration von Antazida-Tabletten

Messung der säureneutralisierenden Kapazität handelsüblicher Antazida

Titrations Intermediate (High School) 60 Min. ~$12,00

Ziel

Die säureneutralisierende Kapazität einer handelsüblichen Antazida-Tablette mithilfe einer Rücktitrierung bestimmen.

Hintergrund

Direct titration of antacid is impractical because the active ingredients dissolve slowly. In a back titration, excess acid is added to the antacid, allowed to react fully, and the remaining unreacted acid is titrated with base. The difference reveals how much acid the antacid neutralized.

Sicherheitswarnungen

  • HCl and NaOH are corrosive
  • Wear safety goggles and gloves
  • Use caution with the hot plate

Erforderliche PSA

goggles gloves lab_coat

Materialien

  • Antacid tablets (2 tablets)
    CaCO₃-based, like Tums
  • Hydrochloric acid (HCl) (200 mL)
    0.5M
  • Sodium hydroxide (NaOH) (100 mL)
    0.5M standardized
  • Phenolphthalein indicator (5 mL)
  • Distilled water (200 mL)

Ausrüstung

50 mL burette Burette stand and clamp 250 mL Erlenmeyer flask 25 mL pipette Mortar and pestle Analytical balance Hot plate

Durchführung

1

Weigh the antacid tablet accurately on the analytical balance and record the mass.

3 Min.
2

Crush the tablet into a fine powder using the mortar and pestle.

3 Min.
3

Transfer the powder to the Erlenmeyer flask. Add exactly 50.0 mL of 0.5M HCl using the pipette.

3 Min. Handle HCl carefully
4

Gently heat the mixture on the hot plate for 10 minutes to ensure complete reaction of the antacid.

12 Min. Do not boil vigorously
5

Allow the solution to cool to room temperature.

5 Min.
6

Add 2-3 drops of phenolphthalein indicator.

1 Min.
7

Fill the burette with 0.5M NaOH. Titrate the excess HCl until a persistent pale pink color appears.

10 Min.
8

Record the volume of NaOH used. Calculate moles of excess HCl, then moles neutralized by the antacid.

5 Min.

Erwartete Ergebnisse

A typical CaCO₃-based antacid tablet (500 mg) should neutralize approximately 10 mmol of HCl. The mass of CaCO₃ calculated should approximate the labeled amount on the package.

Aufräumen

Neutralize all waste solutions before disposal. Rinse glassware thoroughly. Clean the mortar and pestle.

Details

Kategorie
Titrations
Schwierigkeit
Intermediate (High School)
Dauer
60 Min.
Geschätzte Kosten
$12,00
Schritte
8
Materialien
5

Weitere Experimente

Doppelindikator-Titration eines Carbonat-Bicarbonat-Gemisches 55 min EDTA-Komplexometrie zur Wasserhärtebestimmung 45 min Fällungstitration (Mohr-Methode) 45 min Iodometrische Titration von Bleichmittel 50 min Konduktometrische Titration 50 min pH-Titrationskurve 50 min Redoxtitration mit Kaliumpermanganat 50 min Säure-Base-Titration mit Methylorange 40 min Säure-Base-Titration mit Phenolphthalein 45 min Vitamin-C-Titration mit Iod 40 min

Frequently Asked Questions

What is the objective of Rücktitration von Antazida-Tabletten?
Die säureneutralisierende Kapazität einer handelsüblichen Antazida-Tablette mithilfe einer Rücktitrierung bestimmen.
How difficult is Rücktitration von Antazida-Tabletten?
This experiment is rated as Intermediate (High School). It takes approximately 60 minutes to complete.
What safety precautions are needed for Rücktitration von Antazida-Tabletten?
Key safety precautions include: HCl and NaOH are corrosive; Wear safety goggles and gloves; Use caution with the hot plate.
What materials are needed for Rücktitration von Antazida-Tabletten?
The main materials required are: Antacid tablets, Hydrochloric acid (HCl), Sodium hydroxide (NaOH), Phenolphthalein indicator, Distilled water.
What results should I expect from Rücktitration von Antazida-Tabletten?
A typical CaCO₃-based antacid tablet (500 mg) should neutralize approximately 10 mmol of HCl. The mass of CaCO₃ calculated should approximate the labeled amount on the package.