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Question
Fresh milk has a pH of 6. When it changes into curd (yogurt), will its pH value increase or decrease? Why?
Short Answer
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Solution
When fresh milk changes into curd, its pH value decreases (becomes less than 6). This is because bacteria produce lactic acid, which increases the acidity of the milk and lowers its pH.
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Chapter 2: Acids, Bases and Salts - Exercise 2 [Page 101]
