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Question

A milkman added a small pinch of baking soda to fresh milk which had pH close to 6. As a result, pH of the medium is


A

become close to 2

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B

became to 4

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C

did not undergo any change

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D

became close to 8

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Solution

The correct option is D

became close to 8


The explanation of the correct answer:

Option D is correct:

  1. The fresh milk is acidic in nature because its pH is close to 6. And baking sodaNaHCO3 is basic in nature that possesses an alkaline property.
  2. So, when baking soda is added to fresh milk the neutralization reaction is performed that neutralizes the acidity and increases the pH and basicity.
  3. Among all the options, only option D represents the basic solution and increased pH. So, this option is correct.

Explanation of incorrect options:

  1. Option A: The addition of base in acid reduces the acidity instead of increasing it.
  2. Option B: When the baking soda is added to fresh milk the pH increases because acidity reduces.
  3. Option C: The baking soda is not neutral so its addition affects the pH.

Final Answer: The addition of baking soda to fresh milk increases the pH of the medium.


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