एंटासिड टैबलेट का प्रतिगामी अनुमापन

व्यावसायिक एंटासिड की अम्ल-उदासीनीकरण क्षमता मापना

Titrations Intermediate (High School) 60 मिनट ~$12.00

उद्देश्य

प्रतिगामी अनुमापन विधि का उपयोग करके व्यावसायिक एंटासिड टैबलेट की अम्ल-उदासीनीकरण क्षमता निर्धारित करें।

पृष्ठभूमि

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.

सुरक्षा चेतावनियाँ

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

आवश्यक PPE

goggles gloves lab_coat

सामग्री

  • 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)

उपकरण

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

प्रक्रिया

1

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

3 मिनट
2

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

3 मिनट
3

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

3 मिनट Handle HCl carefully
4

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

12 मिनट Do not boil vigorously
5

Allow the solution to cool to room temperature.

5 मिनट
6

Add 2-3 drops of phenolphthalein indicator.

1 मिनट
7

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

10 मिनट
8

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

5 मिनट

अपेक्षित परिणाम

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.

सफाई

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

Frequently Asked Questions

What is the objective of एंटासिड टैबलेट का प्रतिगामी अनुमापन?
प्रतिगामी अनुमापन विधि का उपयोग करके व्यावसायिक एंटासिड टैबलेट की अम्ल-उदासीनीकरण क्षमता निर्धारित करें।
How difficult is एंटासिड टैबलेट का प्रतिगामी अनुमापन?
This experiment is rated as Intermediate (High School). It takes approximately 60 minutes to complete.
What safety precautions are needed for एंटासिड टैबलेट का प्रतिगामी अनुमापन?
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 एंटासिड टैबलेट का प्रतिगामी अनुमापन?
The main materials required are: Antacid tablets, Hydrochloric acid (HCl), Sodium hydroxide (NaOH), Phenolphthalein indicator, Distilled water.
What results should I expect from एंटासिड टैबलेट का प्रतिगामी अनुमापन?
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.