唔識呀!!!chem呀!!!講rate of reaction~(2)

Oi Lam

2007-08-03 4:29 am

12. In an experiment, 80.0cm3 of 1.0M hydrochloric acid was allowed to react with 1.458g of magnesium.

If another piece of magnesium ribbon of the same mass were added to 80.0cm3 of 1.0M ethanoic acid, how would the time required for the reaction to complete differ from that of above experiment? Explain.

回答 (2)

子路

2007-08-03 4:42 am

✔ 最佳答案

hydrochloric acid is a strong acid compared to ethanoic acid.

In 1.0M of ethanoic acid, only 0.4% of the ethanoic acid molecules are dissociated.
''''or you can say''''
In 1.0M of ethanoic acid, not all of the ethanoic acid molecules are dissociated.
In hydrochloric acid , all of its acid molecules are dissociated.

Although they have the same concentration of acid molecules, but they do not have sam concentratoin of H+ ions.They have different pH value.

Therefore, hydrochloric acid is more acidic than ethanoic acid.

The time required for the reaction to complete is shorter if the solution used is hydrochloric acid instead of ethanoic acid.

參考: my chem knowledge

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^_^

2007-08-09 6:24 pm

Very Bad

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