Question

a student dipped a strip of ph paper in distilled water. What colour will he observe. He then dissolved a pinch of common salt in the same sample. What will be the expected change in colour of the ph paper? Give reasons.

Answer 1

the colour of the pH paper in both theses cases will not change as both of the solutions are neutral in nature

Answer 2

distilled water is neutral in nature.

if we add salt to it it become salt water

salt water ph lies between 7.5 to 8.3

so it is a weak base

the color remains unchanged it is green for salt water