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
• B. became to 4
• C. did not undergo any change
• D. became close to 8

Answer 1

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 soda$\left(NaHC{O}_3\right)$ 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.