What Is the PH of a Buffer That Consists of 0.20

question 7

Multiple Choice

What is the pH of a buffer that consists of 0.20 M NaH₂PO₄ and 0.40 M Na₂HPO₄? For NaH₂PO₄, Ka = 6.2 × 10^-8

• A) 6.51
• B) 6.91
• C) 7.51
• D) 7.90
• E) 8.13

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Definitions:

Negatively Skewed Distribution

A distribution shape where the tail is on the left side, indicating that the bulk of values are concentrated on the right.

Mode

The number that occurs the greatest number of times in a series of data.

Median

The middle value in a data set when the values are arranged in order, or average of the two middle values when there is an even number of observations.

Mean

The average value of a set of numbers, calculated by adding all the numbers together and dividing by the count of the numbers.