Sulfuric acid is used in both cases.
Concentrated sulfuric acid is a dehydrating catalyst, and dilute sulfuric acid is a hydrating catalyst.
For the dehydration of ethanol to ethylene is the catalyst used a zeolite catalyst? and for the hydration is it also a zeolite catalyst just diluted?
Sulfuric acid is used in both cases.
Concentrated sulfuric acid is a dehydrating catalyst, and dilute sulfuric acid is a hydrating catalyst.
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Yeah as fan96 said, the catalyst used is sulfuric acid for both the hydration of ethylene and the dehydration of ethanol.
Dehydrating ethanol to ethylene requires concentrated sulfuric acid as a catalyst.
Hydrating ethylene to ethanol requires dilute sulfuric acid as a catalyst.
A nice way to remember which catalyst is used is by thinking:
- Hydration implies adding water therefore dilute sulfuric acid is used (dilute sulfuric acid has lots of water compared to concentrated sulfuric acid)
- Dehydration implies 'removing' water therefore concentrated sulfuric acid is used (since there isn't much water in concentrated acid)
It's not really a 'chemistry' way to think about it though but it works lol.
Last edited by captainhelium; 15 Feb 2018 at 10:19 PM.
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