關於extraction of potassium既問題

2010-04-08 4:26 am

我學就係話potassium係用electrolysis去提取
但咁岩睇到個關於potassium既網就話佢可以同碳燒黎提取..
究竟係吾係??
吾該曬

<<Extraction

Potassium metal is prepared by heating potassium carbonate with charcoal.

2 C + KCO3 ==> 2 K + 3 CO2>>>>>>>>>>>>
果個網所示..
可埋條式係咪有d錯??

回答 (1)

胡雪8°

2010-04-08 9:41 am

✔ 最佳答案

這個網所說的是錯誤的，單看把 chemical formula K2CO3 寫錯成水準如何。

Zinc or less reactive metal can be extracted by heating its carbonate with charcoal. The reaction consists of two steps. In the first step, the metal carbonate is decomposed by heat to form metal oxide and carbon dioxide. In the second step, the metal oxide is reduced by charcoal on heating to give the metal and carbon dioxide.

For example, heating the mixture of copper(II) carbonate with charcoal.
CuCO3 → CuO + CO2
2CuO + C → 2Cu + CO2
The overall equation is :
2CuCO3 + C → 2CuO + 3CO2

When heating K2CO3 with charcoal, no reaction occurs. Firstly, K2CO3 does not decompose on heating. Secondly, heating K2O with charcoal gives no reaction.

參考: 胡雪八

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