Which Is the Best Choice for Preparing a Buffer with a PH

question 37

Multiple Choice

Which is the best choice for preparing a buffer with a pH of 3.5?

• A) C₅H₅O₅COOH, K_a = 4.0 × 10^-6
• B) HOC₆H₄OCOOH, K_a = 1.0 × 10^-3
• C) HBrO, K_a = 2.3 × 10^-9
• D) C₆H₄(COOH)₂, K_a = 2.9 × 10^-4
• E) CH₃COOH, K_a = 1.8 ×10^-5

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Definitions:

Null Hypothesis

In statistics, it posits that there is no effect or difference among the groups being studied or variables being compared.

Alpha

In hypothesis testing, alpha level represents the threshold for rejecting the null hypothesis, often set at 0.05 or 5% risk of Type I error.

T-statistic

A statistic calculated from a dataset to compare the mean of the data to a hypothetical mean as part of a t-test.

Critical Value

The boundary value from a statistical distribution where, if the observed test statistic is beyond this point, the null hypothesis is rejected.