Question

Q7. Read the passage given below and answer the following questions.

A student performed an activity in which 200 ml of lime water is taken. Few drops of phenolphthalein are added to lime water. The solution turns pink. The student blows air into this beaker with a straw and observed a color change

1. Why did the lime water turn pink?

2. What was the color change observed when the student passed air through the beaker?

3. Why did the change occur in the second case?


pls answer fast​

Answer 1

Answer:

1) Lime water is a base, so when the phenolphthalein was added to the solution, it turned the solution pink. When enough carbonic acid is formed it neutralizes the lime water, which is a base and makes the solution an acid. Therefore with the phenolphthalein, the color disappears in the now acidic solution.