Question

why buttermilk becomes more sour when you keep it for a a day​

Answer 1

Answer:

Buttermilk is high in lactic acid, which is hostile to harmful bacteria growth, however, this doesn't last forever, and after a few weeks, the harmful bacteria begin to grow as the buttermilk continues to ferment and become more acidic.

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Answer 2

Answer:

BUTTERMILK IS PREPARED USING CURD , THERE ARE BACTERIAS IN THE CURD KNOW AS LACTOBACILLUS, BECAUSE OF LACTOBACILLUS WILL GROW EVERY MINUTE IN CURD/ BUTTERMILK.SO, WHEN YOU KEEP IT FOR A DAY THE CURD/BUTTERMILK TASTES SOUR