The extract of red rose turns the liquid X to green. What will the nature of liquid X be? What will happen when excess of amla juice is added to liquid X?
Liquid X is basic in nature. This is because red rose extract gives green colour in basic solutions and red colour in acidic solutions.
When excess amla juice is added to liquid X, neutralisation will occur. Amla juice is acidic in nature.
The acid from amla juice will neutralise the base present in liquid X. As excess amla juice is added, the solution will become acidic.
Consequently, the colour of the red rose extract will change from green to red, indicating the acidic nature of the resulting solution.
Explanation
The chapter establishes that red rose extract gives green colour in basic solutions and red colour in acidic solutions. Since liquid X turns the extract green, it must be basic. Amla juice is listed in Table 2.2 as an acidic substance. When an acid is added to a base, neutralisation occurs (Acid + Base → Salt + Water + Heat). With excess amla juice, the solution becomes acidic, and the indicator colour changes accordingly.
Solution Steps
Red rose extract gives green colour in basic solutions and red colour in acidic solutions
Liquid X is basic in nature because it turns red rose extract green
Amla juice is acidic in nature
When excess amla juice is added to liquid X, neutralisation occurs between the acid and base
With excess amla juice, the solution becomes acidic
The indicator colour changes from green to red, confirming the acidic nature of the resulting solution