Question

In which solution will thymol blue indicator appear blue?

(1) 0.1 M CH3COOH (3) 0.1 M HCl
(2) 0.1 M KOH (4) 0.1 M H2SO4

Answer 1

In 0.1 M KOH, thymol blue indicator would appear blue. 

Answer 2

Answer: (2) 0.1 M KOH

Step-by-step explanation:

Thymol blue is an universal indicator. Thymol blue has a blue color when in basic conditions (pH > 7), a green color in neutral conditions (pH =7), and a yellow color in acidic conditions (pH < 7).

pH or pOH is the measure of acidity or alkalinity of a solution. pH is calculated by taking negative logarithm of hydrogen ion concentration.

0.1 M
`CH_3COOH` , 0.1 M
`HCl` and 0.1 M
`H_2SO4` are all acidic in nature.

Thus thymol blue will appear blue in basic 0.1 M KOH.