The Indicator Propyl Red Has K_a = 3

question 77

Multiple Choice

The indicator propyl red has K_a = 3.3 × 10^-6. What would be the approximate pH range over which it would change color?

• A) 3.5 - 5.5
• B) 4.5 - 6.5
• C) 5.5 - 7.5
• D) 6.5 - 8.5
• E) 7.5 - 9.5

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