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Question 18M.3.SL.TZ2.8b.iii

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Date May 2018 Marks available [Maximum mark: 2] Reference code 18M.3.SL.TZ2.8b.iii
Level SL Paper 3 Time zone TZ2
Command term Distinguish Question number b.iii Adapted from N/A
b.iii.
[Maximum mark: 2]
18M.3.SL.TZ2.8b.iii

In the generator method of ethanoic acid fermentation, Acetobacter aceti are grown over wood shavings in a fermenter to the point where they form a biofilm.

At the base of the fermenter oxygen is bubbled in, which then rises through the wood shavings. Ethanol drips through the wood shavings. At a suitable temperature the ethanol is converted to ethanoic acid, which is withdrawn from the bottom of the fermenter, and new ethanol is added at the top.

(b.iii)

Distinguish between batch fermentation and continuous fermentation.

[2]

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