Exhibit 2B Contains Information on the PK's of Some Common

question 5

Multiple Choice

Exhibit 2B Contains information on the pK's of some common buffers. Which of the following is important to know when deciding if a given buffer will be effective for an experiment?

• A) the pK_a of the buffer compound
• B) the buffer capacity
• C) the concentration of the buffer
• D) whether the experiment is likely to generate hydrogen ions or hydroxide ions
• E) all of these are important considerations

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Definitions:

Face Validity

Refers to the extent to which a test appears to measure what it is intended to measure, based purely on its surface characteristics.

Mean Score

The average value obtained by dividing the sum of all values in a set by the number of values in that set; used as a measure of central tendency in statistics.

Standard Deviation

A statistical measure of the dispersion or variability within a set of numerical data, indicating how much individual data points differ from the mean.

Mode

The most frequent score.