You Need to Use KH₂PO₄ and K₂HPO₄ to Prepare a Buffer

question 32

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

---

Definitions:

Depreciation

Allocating the cost of a physical asset across its life of utility in a systematic manner.

Acquires Land

The process by which a company or individual procures land as an asset.

Land

The surface of the earth, including the soil and anything attached to it naturally, used as a fixed asset in accounting, with no depreciation over time.

Closing Costs

Fees and expenses, beyond the price of the property, incurred by buyers and sellers in transferring ownership of real estate.