CO₂와 석회수 시험

수산화칼슘으로 이산화탄소 검출하기

Gas Laws Beginner (Middle School) 20 분 ~$5.00

목표

탄산염과 산의 반응으로 이산화탄소 기체를 발생시키고 석회수 시험으로 그 존재를 확인한다.

배경

When baking soda (sodium bicarbonate) reacts with vinegar (acetic acid), CO₂ gas is produced. Bubbling this gas through limewater (calcium hydroxide solution) produces a characteristic white milky precipitate of calcium carbonate, confirming the presence of CO₂.

안전 경고

  • Limewater is mildly irritating — avoid eye contact
  • CO₂ is an asphyxiant in large quantities — work in ventilated area

필수 개인 보호 장비

goggles

재료

  • Baking soda (NaHCO₃) (10 g)
  • White vinegar (50 mL)
    5% acetic acid
  • Limewater (Ca(OH)₂ solution) (100 mL)
    Clear, saturated

장비

Erlenmeyer flask (250 mL) Rubber stopper with delivery tube Test tubes Rubber tubing

실험 절차

1

Pour 100 mL of clear limewater into a test tube or small beaker.

2 분
2

Place 10 g of baking soda in the Erlenmeyer flask.

1 분
3

Add 50 mL of vinegar to the flask. Quickly insert the stopper with delivery tube.

2 분 Vigorous effervescence
4

Direct the delivery tube into the limewater. Bubble the CO₂ through for 2-3 minutes.

3 분
5

Observe the limewater turning milky white as calcium carbonate precipitate forms.

2 분
6

Continue bubbling. If enough CO₂ passes through, the solution may turn clear again as soluble Ca(HCO₃)₂ forms.

5 분

예상 결과

The clear limewater turns milky white due to CaCO₃ precipitation: Ca(OH)₂ + CO₂ → CaCO₃ + H₂O. With excess CO₂, the milkiness clears: CaCO₃ + CO₂ + H₂O → Ca(HCO₃)₂.

정리

Neutralize remaining vinegar solution. Dispose of limewater down the drain. Rinse all equipment.

Frequently Asked Questions

What is the objective of CO₂와 석회수 시험?
탄산염과 산의 반응으로 이산화탄소 기체를 발생시키고 석회수 시험으로 그 존재를 확인한다.
How difficult is CO₂와 석회수 시험?
This experiment is rated as Beginner (Middle School). It takes approximately 20 minutes to complete.
What safety precautions are needed for CO₂와 석회수 시험?
Key safety precautions include: Limewater is mildly irritating — avoid eye contact; CO₂ is an asphyxiant in large quantities — work in ventilated area.
What materials are needed for CO₂와 석회수 시험?
The main materials required are: Baking soda (NaHCO₃), White vinegar, Limewater (Ca(OH)₂ solution).
What results should I expect from CO₂와 석회수 시험?
The clear limewater turns milky white due to CaCO₃ precipitation: Ca(OH)₂ + CO₂ → CaCO₃ + H₂O. With excess CO₂, the milkiness clears: CaCO₃ + CO₂ + H₂O → Ca(HCO₃)₂.