Question

which of the following can be used as an acid base indicator by visually impaired students? litmus, turmeric,vanilla essence,petunia leaves

Answer 1

Litmus paper is the best for those who are not visually impaired. For those who are visually impaired may be vanilla presence is better . I am not sure.

Answer 2

Answer:

Vanilla essence can be used by visually impaired students as an acid-base indicator.

Explanation:

• If there is a change in pH, the acid-base indicators show a change in color.
• When there is a change in hydrogen ion concentration, the acid-base indicator responds to it.

Among the given indicators, petunia leaves, turmeric, and litmus show a change in color when the pH of the solution changes. So, they cannot be used by visually impaired students as color change cannot be detected.

But, vanilla essence comes in the category of an olfactory indicator. It means that the smell of vanilla essence is different in basic and acidic solutions. This change in smell can be easily detected by visually impaired students.

Hence, Vanilla essence can be used by visually impaired students as an acid-base indicator.