A pH meter is used to test the pH of a solution.See the figure below. 
How is the solution classified?
Definitions:
Ivan Pavlov
A Russian physiologist best known for his work in classical conditioning, particularly his experiments with dogs that led to the concept of the conditioned reflex.
Classical Conditioning
A learning process in which a neutral stimulus becomes associated with an inherently meaningful stimulus and acquires the capacity to evoke a similar response.
John B. Watson
A prominent psychologist and the founder of behaviorism, emphasizing the study of observable behavior over the mind.
Generalized Expectancies
Beliefs about how often actions lead to rewards versus punishment.
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