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Gracie squeezed some grapes and kept the juice in a vessel for 5 days at room temperature. On the fifth day she found that the juice tasted sour and appeared frothy. What caused this change?
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Gracie squeezed some grapes and kept the juice in a vessel for 5 days at room temperature. On the fifth day she found that the juice tasted sour and appeared frothy.

What caused this change?

User DroidBomb
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1 Answer

4 votes
The cause for the change of the juice was lactic acid fermentation of the grape juice by anaerobic bacteria.
User Jva
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