CO₂と石灰水のテスト

水酸化カルシウムで二酸化炭素を検出する

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

目的

炭酸塩と酸の反応で二酸化炭素ガスを発生させ、石灰水テストでその同定を確認する。

背景

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.

安全上の警告

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

必要なPPE

goggles

材料

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

器具

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

手順

1

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

2 分
2

Place 10 g of baking soda in the Erlenmeyer flask.

1 分
3

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

2 分 Vigorous effervescence
4

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

3 分
5

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

2 分
6

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

5 分

予想される結果

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.

後片付け

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

詳細

カテゴリ
Gas Laws
難易度
Beginner (Middle School)
所要時間
20 分
推定費用
$5.00
ステップ数
6
材料
3

その他の実験

STPでの気体のモル体積 35 min シャルルの法則（風船実験） 30 min デカルトダイバー 15 min ボイルの法則の検証 40 min マグネシウムを用いたガス化学量論 40 min 拡散速度の比較（グラハムの法則） 30 min 水素ガスの捕集 35 min 蒸気圧と沸点 45 min

Frequently Asked Questions

What is the objective of CO₂と石灰水のテスト?
炭酸塩と酸の反応で二酸化炭素ガスを発生させ、石灰水テストでその同定を確認する。
How difficult is CO₂と石灰水のテスト?
This experiment is rated as Beginner (Middle School). It takes approximately 20 minutes to complete.
What safety precautions are needed for CO₂と石灰水のテスト?
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 CO₂と石灰水のテスト?
The main materials required are: Baking soda (NaHCO₃), White vinegar, Limewater (Ca(OH)₂ solution).
What results should I expect from CO₂と石灰水のテスト?
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.