Phenolphthalein Is an Acid-Base Indicator That Is Colorless in Its

question 2

Multiple Choice

Phenolphthalein is an acid-base indicator that is colorless in its acid form and pink in its basic form, changing at pH = 8.5. Bromcresol green is yellow in its acidic form and blue in its basic form, changing at pH = 4.8. A solution is colorless in phenolphthalein and blue in bromcresol green. Therefore we can conclude that the pH of the solution is ____.

• A) exactly 7.0
• B) greater than 8.5
• C) between 7.0 and 8.5
• D) between 4.8 and 8.5
• E) less than 4.8

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Definitions:

Neutral

A transmission setting in which no gear is engaged, allowing the engine to operate or idle without driving the wheels.

ECU

Engine Control Unit; a type of electronic control unit that controls a series of actuators on an internal combustion engine to ensure optimal engine performance.

Codes Logged

Digital or electronic records of errors, faults, or operational data captured by a system's diagnostic tools.

Lowest-priority Code

In computing or digital communications, a code assigned to processes or signals deemed least critical, indicating they are to be executed or addressed last.