How does adding brandy to wine prevent it from becoming vinegar?THIS DEALS WITH A CHEMISTRY EXPERIMENT THAT I WILL BE INVOLVED IN.

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dastice | Elementary School Teacher | (Level 1) Assistant Educator

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Adding brandy (or another neutral alcohol) to wine increases its alcohol content.  When the alcohol content is 15-18%, yeast is unable to work so no further fermentation will occur.  This prevents the wine from turning acidic, particularly in warm environments.