If a small amount of baking soda is added to fresh milk which had pH close to
6, then the pH of the medium becomes close to
(a) red to blue
(b) colourless to blue
(c) blue to purple
(d) blue to red
Answers
Answer:
The Correct Answer is (a) Red to Blue
Explanation:
Milk has a pH of about 6. Milk spoils quickly at this pH and is no longer palatable.
As a result, it cannot be preserved for a prolonged period of time. The milkman adds a small bit of baking soda to fresh milk to keep it from spoiling.
Sodium bicarbonate is the chemical name for baking soda. It is fundamental in nature.
The pH of milk is raised from 6 to 7 when baking soda is added. The milk has changed pH and is now alkaline.
As a result, milk can be stored for a longer period of time.
Now regarding the pH, as we know about the pH scale and Litmus paper.
If the pH is lesser than 7 it is acidic and above 7 is basic, and Litmus paper turns Red in acidic solution and Blue in basic solution
Therefore, the solution will turn Red to Blue on addition of baking soda