Carbon Dioxide Gas: Chalk and Dilute Acid, Collected from the Bottom Up

Carbon dioxide, Black's fixed air, is locked up in chalk and limestone, and an acid sets it free. It is half as heavy again as air, so it can be poured from one vessel into another and fills a bottle from the bottom up. In a closed space it suffocates: work in an open, airy room. The picture: our diagram of the generating bottle, the delivery tube and the candle test.

初学者

An hour

说明

Set up

Put lumps of chalk in a wide bottle. Fit a stopper with two holes: one for a funnel tube reaching nearly to the bottom, one for a bent delivery tube just through the stopper. Lead the delivery tube down to the bottom of an upright collecting bottle.

此步骤所需材料：

天然白垩（生料块）60 克

所需工具：

带塞玻璃瓶

橡胶塞

玻璃管套件

带颈玻璃漏斗

等臂天平

Make the gas

Pour dilute sulphuric acid in through the funnel until it covers the chalk. It froths and the gas passes over.

所需工具：

稀硫酸

带颈玻璃漏斗

化学防溅护目镜

橡胶手套

Fill and test

The heavy gas fills the collecting bottle from the bottom and pushes the air out at the top. Let a lighted candle down into the mouth to show the gas is there, then stopper the bottle and fill the next.

所需工具：