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A milkman adds a small amount of baking soda to milk. This makes the p

June 1, 2025 by rawan239

A milkman adds a small amount of baking soda to milk. This makes the pH of the milk

strongly alkaline

weakly alkaline

strongly acidic

weakly acidic

This question was previously asked in

UPSC CAPF – 2021

Download PDF Attempt Online

The correct answer is B) weakly alkaline.

Baking soda is sodium bicarbonate (NaHCO₃), which is a weak base. Milk is slightly acidic or close to neutral, typically having a pH between 6.7 and 6.9. Adding a small amount of a weak base like baking soda to milk will neutralize some of the natural acidity and shift the pH towards the alkaline side. A small amount of a weak base will make the solution weakly alkaline, not strongly alkaline or acidic. Milkmen traditionally added baking soda to milk to prevent it from souring quickly, as it neutralizes the lactic acid produced by bacteria, which causes souring and lowers the pH.

The pH scale measures acidity and alkalinity. A pH of 7 is neutral. A pH less than 7 is acidic, and a pH greater than 7 is alkaline (basic). Adding a base increases the pH.

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