Chapter 17, Problem 32E

Thymol blue indicator has two pH ranges. It changes color from red to yellow in the pH range from 1.2 to 2.8, and from yellow to blue in the pH range from 8.0 to 9.6. What is the color of the indicator in the following situations?

a. The indicator is placed in 350.0 mL of 0.205 M HCl.

b. To the solution in part (a) is added 250.0 mL of 0.500 M ${\text{NaNO}}_{\text{3}}$

c. To the solution in part (b) is added 150.0 mL of 0.100 M NaOH.

d. To the solution in part (b) is added 150.0mL of 0.100M NaOH.

e. To the solution in part (c) is added 5.00gBa(OH)₂.