How to make cement at home (simple experiment)

Описание

This experiment is not included in the MEL Chemistry subscription–we just love to show you the beauty of chemistry?
For cool and safe experiments to do at home sign up to MEL Science here: https://goo.gl/ZK6dpv

It’s easy to make the sim­plest type of ce­ment your­self. In this ex­per­i­ment, we’ll pre­pare a mix­ture which you can use to make a lit­tle house, for ex­am­ple for a dog.

Safe­ty pre­cau­tions
Wear a pro­tec­tive mask, gloves and glass­es, and work in a well-ven­ti­lat­ed room.

Warn­ing! Only un­der adults su­per­vi­sion.

Reagents and equip­ment:
* build­ing lime (cal­ci­um ox­ide, 100 g);
* sand (300 g);
* wa­ter (100-150 ml);
* deep con­tain­er for mix­ing;
* trow­el;
* bricks.

Step-by-step in­struc­tions
Mix the build­ing lime with wa­ter. Grad­u­al­ly add sand and stir thor­ough­ly. We get a sim­ple ce­ment mix­ture. Ap­ply it to bricks and leave for a week. The bricks are stuck to­geth­er!

Pro­cess­es de­scrip­tion
In the re­ac­tion of cal­ci­um ox­ide with wa­ter, cal­ci­um hy­drox­ide forms.
СаО + Н₂О = Са(ОН)₂
In air, cal­ci­um hy­drox­ide re­acts with car­bon diox­ide with the for­ma­tion of durable cal­ci­um car­bon­ate, which en­velops and sticks the sand par­ti­cles to­geth­er
Са(ОН)₂ + СО₂ = СаСО₃ + Н₂О