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Vinegar and Citric Acid

Vinegar and Citric Acid
What is the pH of the medium when molasses is used as substrate for the production of citric acid?

3
5
4
6

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Vinegar and Citric Acid
Vinegar production consists of

aerobic fermentation
anaerobic fermentation
anaerobic fermentation followed by aerobic fermentation
aerobic fermentation followed by anaerobic fermentation

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Vinegar and Citric Acid
For the recovery of citric acid after fermentation, Ca(OH)2 is added to the slurry to

precipitate calcium sulphate
precipitate calcium carbonate
precipitate calcium citrate
precipitate calcium phosphate

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Vinegar and Citric Acid
In submerged process for the fermentation to produce citric acid,

A. niger floats on the surface of solution
A. niger is used with solid substrate as sweet potato
Fungal mycelium grows through out the solution in a deep tank
both (a) and (b)

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Vinegar and Citric Acid
Spirit vinegar is produced from

ethanol
ale
malted grain
fruit juices

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Vinegar and Citric Acid
During recovery step of citric acid, calcium citrate formed is treated with which of the following acid to precipitate calcium?

HCl
HNO3
H2SO4
None of these

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