What Is the PH of a Buffer That Consists of 0.20

question 77

Multiple Choice

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

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

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Definitions:

Binomial Experiment

An experiment with two outcomes (success and failure) for each trial, with a fixed number of trials and constant probability of success.

Successes

The occurrences of a defined outcome of interest in a series of trials or tests.

Hypergeometric Distribution

A discrete probability distribution that describes the probability of k successes in n draws, without replacement, from a finite population of size N that contains exactly K successes.

Probability Distribution

A mathematical description of a random phenomenon in terms of the probabilities of its outcomes.