The Indicator Propyl Red Has K_a = 3

question 92

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 to 5.5
• B) 4.5 to 6.5
• C) 5.5 to 7.5
• D) 6.5 to 8.5
• E) None of these choices is correct.

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Definitions:

Symmetry

A property where a shape or figure is identical on both sides of a dividing line or plane, indicating balance and proportion.

Standard Deviation

An analysis method to quantify the level of scattering or variability among a set of measures.

Standard Normal Distribution

A normal distribution with a mean of zero and a standard deviation of one, used in statistical analyses.

Probability

A statistical metric that indicates the extent of the chance of an event taking place, expressed within the range from 0 (no chance) to 1 (absolute certainty).