Which May Be Used to Prepare a Buffer Having a PH

question 37

Multiple Choice

Which may be used to prepare a buffer having a pH of 8.8? K_a = 7 × 10^-3 for H₃PO₄; 8 × 10^-8 for H₂PO₄^-; 5 × 10^-13 for HP O₄^2-

• A)NaH₂PO₄ only
• B)NaH₂PO₄ and Na₂HPO₄
• C)Na₃PO₄ and Na₂HPO₄
• D)NaHPO₄ and H₃PO₄
• E)H₃PO₄ and Na₃PO₄

---

Definitions:

Personal Front

The performance tactics we use to present ourselves to others, including appearance, costume, and manner.

Backstage

In sociological and performance terms, the regions where individuals prepare and rehearse before entering the 'front stage' where they perform their social roles.

Superego

In psychoanalytic theory, the part of the human psyche that represents internalized societal standards, morals, and ideals, acting as a counterbalance to primal desires.

Conscience

An inner feeling or voice viewed as acting as a guide to the rightness or wrongness of one's behavior.