A PH 488 Buffer Was Prepared by Dissolving 0

question 41

Multiple Choice

A pH 4.88 buffer was prepared by dissolving 0.10 mol of benzoic acid (K_a = 6.3 × 10^-5) and 0.50 mol of sodium benzoate in sufficient pure water to form a 1.00 L solution.To a 70.0 mL aliquot of this solution was added 2.00 mL of 2.00 M aqueous HI solution.What was the pH of the new 72.0 mL solution?

• A)2.84
• B)3.16
• C)3.36
• D)4.65
• E)4.90

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Definitions:

Reconditioning

The process of retraining or rehabilitating someone's behavior, physical condition, or responses to stimuli, often after an injury or period of inactivity.

Spontaneous Recovery

The return of a conditioned response that had been previously eliminated, following a timeframe where there was no contact with the conditioned stimulus.

CS-US Trials

In conditioning, trials where a conditioned stimulus (CS) is presented before an unconditioned stimulus (US) to create an association.

Extinction

In behavioral psychology, the process by which a conditioned response decreases in frequency and eventually disappears.