A Solution Is Prepared by Dissolving 20

question 94

Multiple Choice

A solution is prepared by dissolving 20.0 g of K₂HPO₄ and 25.0 g of KH₂PO₄ in enough water to produce 1.0 L of solution. What is the pH of this buffer? For phosphoric acid (H₃PO₄) , K_a2 = 6.2 × 10⁻⁸.

• A)7.70
• B)7.42
• C)7.21
• D)7.00
• E)6.72

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Definitions:

Sterile Technique

A set of practices designed to minimize the presence of pathogens and reduce the likelihood of infection.

Infection

The invasion and multiplication of microorganisms in body tissues, which can cause disease or illness.

Hypoallergenic Tape

A type of adhesive tape designed to reduce allergic reactions, making it suitable for sensitive skin.

Allergic

Having an immune response to substances (allergens) that are typically harmless to most people, leading to symptoms like sneezing, itching, and rash.