INBDE (Integrated National Board Dental Examination) Practice Exam

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Which chemical maintains the fixer's acidity and neutralizes the developer?

Sodium Sulfate
Ethanol
Acetic Acid
Glycerol

The correct answer is: Acetic Acid

Acetic acid is the chemical that maintains the fixer's acidity and neutralizes the developer. Acetic acid helps to stop the development process by neutralizing the alkaline developer solution. Sodium sulfate, ethanol, and glycerol do not serve this specific purpose in the fixing process of film development. Sodium sulfate is commonly used as a clearing agent, ethanol is a solvent, and glycerol is a drying agent and viscosity modifier, but they do not play a role in maintaining fixer acidity or neutralizing the developer.