粉筆有咩實驗(屋企)做？

Question

去文具輔買便便地5蚊盒o既粉筆...

chemical formula係咩？

係咪CaCO3?

以我記得o既

CaCO3 + heat -> CaO + CO2

CaO + 2H2O -> Ca(OH)2 + H2

好似話要filter左先變做lime water...

冇filter paper... 仲有咩其它方法 filter?

Ca(OH)2 + CO2 -> CaCO3 + H2O 打回原形...

咁樣.... 直接o係第一步加(excess) carbon dioxide 得唔得？

CaCO3 + H2O + CO2 -> Ca(HCO3)2

依個實驗會唔會有危險...

仲有... d粉筆CaCO3 + 2HCl -> CaCl2 + CO2 + H2... 檸檬茶得唔得 = =?? or 漂白水有冇HCl??

仲有.. 我想知CaO + 2H2O -> Ca(OH)2 + H2... 之外... 足唔足以"泵"倒個氫氣球...?? or 有咩其它方法... 可以做類似實驗去泵倒個氫氣球...?

Thz...

Update:

CaCO3 + heat -> CaO + CO2

熱水得唔得？

Update 2:

Re: welcon9009

Then any other material that is daily used, contains CaCO3?

Answer 1

Favorite Answer

Blackbroad chalk is Calcium Sulphate CaSO4 not CaCO3 . You need to redesign your experiments !

Answer 2

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