Two samples are given. Sample A = HCL(Hydrochloric acid) , Sample B(sodium hydroxide) = NaOH.
Hydrochloric acid is an acid that can turn the blue litmus into red while sodium hydroxide is a base that can turn the red litmus blue.
pH is considered as the figure that can express the alkalinity or acidity of the solution on the logarithmic scale. pH 7 can be neutral.
SEE WHAT WE CAN DO IS BOTH ARE ACID & BASE
pH IS NOTHING BUT AN INDICATOR
SO POUR SOME AMOUNT OF ACID IN pH paper and do same with NaOH
I THINK IT WILL BE HELPFUL
Our aim is to find whether they are acid or base.
When tested with pH paper, if the colour changes to red end, then it is an acid.
We get the colour as red when we dip the pH paper in HCl solution.
If the color of the pH paper changes to dark blue end, then it's is a base.
We get the resultant colour for NaOH.
Hope it helps