Question

10) A researcher does some experiments on wastewater from a factory. He put a drop of the
wastewater on a litmus paper. The litmus paper turned red. He mixed a certain solution into the water
sample and retested it with a litmus paper. This time the colour did not change. The solution was added
to the wastewater before releasing it into a nearby water body. What is the importance of the solution
in the process?
(a) To increase the speed of water flow
(b) To identify the path of flowing water
To change the colour of the wastewater
(d) To neutralize the acidity in the wastewater​

Answer 1

Answer:

I think the answer is d......

thanks........

Answer 2

The importance of the solution in the process is (d) To neutralize the acidity in the wastewater

• When the researcher tested the wastewater from the factory, the colour of the litmus paper turned red which indicates the wastewater is acidic.
• The acidic wastewater is never thrown to the nearby water bodies because it is not suitable for aquatic organisms. With high acidity, the mucus on the surface of aquatic organisms thickens which affects oxygen intake.
• Hence, the solution was added to neutralize the acidity of wastewater before releasing it into a nearby water body.