What Is the PH of a Buffered System Made by Dissolving

question 85

Multiple Choice

What is the pH of a buffered system made by dissolving 17.42 g of KH₂PO₄ and 20.41 g of K₂HPO₄ in water to give a volume of 200.0 mL? The K_a2 for dihydrogen phosphate is 6.2 × 10^-8 and the equilibrium reaction of interest is H₂PO₄^-(aq) + H₂O(l) ⇌ H₃O⁺(aq) + HPO₄^-(aq) .

• A)7.03
• B)7.17
• C)7.38
• D)7.58

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Definitions:

Public Choice Theory

An economic theory that studies how public sector decisions are made, considering individuals in the public sector as self-interested agents and applying the tools of economics to political science.

Government Decision Making

The process by which governments choose between different policies, actions, or strategies to address specific public issues or problems.

Rent-Seeking Behavior

The actions by persons, firms, or unions to gain special benefits from government at the taxpayers’ or someone else’s expense.

Public Choice Theory

An economic theory that applies principles of economics to political science, analyzing how public decisions are made and the behaviors of voters, politicians, and bureaucrats.