You Need to Use KH₂PO₄ and K₂HPO₄ to Prepare a Buffer

question 93

Multiple Choice

You need to use KH₂PO₄ and K₂HPO₄ to prepare a buffer with a pH of 7.45. Which of the following ratios of [base]/[acid] is required? For phosphoric acid, (H₃PO₄) , K_a2 = 6.2 × 10^-8.

• A) [base]/[acid] = 1.75
• B) [base]/[acid] = 1.27
• C) [base]/[acid] = 1.24
• D) [base]/[acid] = 0.79
• E) [base]/[acid] = 0.57

Understand supply-side economics objectives and criticisms.

Recognize the significance of constant money supply growth as advocated by some economists.

Grasp the concept of rational expectations in economic policy-making.

Understand the inherent stability of the private sector as perceived by monetarists.

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Definitions:

Bartolome de las Casas

A 16th-century Spanish friar and historian, known for his advocacy for the rights of indigenous peoples in the Americas and critical accounts of the Spanish conquest.

Conquistadors

Spanish explorers and soldiers who led military expeditions in the Americas and Asia during the 16th century, often subjugating native populations.

Ecomiendas

A labor system instituted by the Spanish in the Americas, granting colonists the right to the labor of Indigenous peoples in exchange for their conversion to Christianity.

Tropical Diseases

Infectious diseases that are prevalent in or unique to tropical and subtropical regions, often transmitted by insects or contaminated water.