With reference to the indicators listed in Exercise 27, what would be the color of each combination?

(a) 2,4-dinitrophenol in 0.100 M HCl(aq)

(b) Chlorphenol red in 1.00 M NaCl(aq)

(c) Thymolphthalein in 1.00 M 

(d) Bromcresol green in seawater (recall Figure 17-7)

Exercise 27

A handbook lists the following data:

(a) Which of these indicators change color in acidic solution, which in basic solution, and which near the neutral point?

(b) What is the approximate pH of a solution if bromcresol green indicator turns green? if chlorphenol red turns orange?

Figure 17-7

Transcribed Image Text:

Indicator Bromphenol blue Bromcresol green Bromthymol blue 2,4-Dinitrophenol Chlorphenol red Thymolphthalein KHIn 1.4 x 10-4 2.1 x 10-5 7.9 x 107 1.3 x 10-4 1.0 x 10-6 1.0 X 10-10 Color Change Acid → Anion yellow → blue yellow → blue yellow → blue colorless →→yellow yellow → red colorless → blue