제산제 정제의 역적정

시판 제산제의 산 중화 능력 측정하기

Titrations Intermediate (High School) 60 분 ~$12.00

목표

역적정법을 이용하여 시판 제산제 정제의 산 중화 능력을 결정한다.

배경

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.

안전 경고

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

필수 개인 보호 장비

goggles gloves lab_coat

재료

  • 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)

장비

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

실험 절차

1

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

3 분
2

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

3 분
3

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

3 분 Handle HCl carefully
4

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

12 분 Do not boil vigorously
5

Allow the solution to cool to room temperature.

5 분
6

Add 2-3 drops of phenolphthalein indicator.

1 분
7

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

10 분
8

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

5 분

예상 결과

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.

정리

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

세부 정보

카테고리
Titrations
난이도
Intermediate (High School)
소요 시간
60 분
예상 비용
$12.00
단계
8
재료
5

더 많은 실험

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Frequently Asked Questions

What is the objective of 제산제 정제의 역적정?
역적정법을 이용하여 시판 제산제 정제의 산 중화 능력을 결정한다.
How difficult is 제산제 정제의 역적정?
This experiment is rated as Intermediate (High School). It takes approximately 60 minutes to complete.
What safety precautions are needed for 제산제 정제의 역적정?
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 제산제 정제의 역적정?
The main materials required are: Antacid tablets, Hydrochloric acid (HCl), Sodium hydroxide (NaOH), Phenolphthalein indicator, Distilled water.
What results should I expect from 제산제 정제의 역적정?
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.