Which Is the Best Acid to Prepare a Buffer with the Lowest

question 124

Multiple Choice

Which is the best acid to prepare a buffer with the lowest pH?

• A) C₅H₅O₅COOH, K_a = 4.0 × 10^-6
• B) HOC₆H₄OCOOH, K_a = 1.0 × 10^-3
• C) HBrO, K_a = 2.3 × 10^-9
• D) C₆H₄(COOH)₂, K_a = 2.9 × 10^-4
• E) CH₃COOH, K_a = 1.8 × 10^-5

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Definitions:

Planetary Carrier Assembly

A component of a planetary gear system that holds one or more gears in place, allowing them to orbit a central gear for speed or torque adjustment.

Planetary Gearset

A compact and efficient gear system used in transmissions, consisting of a central gear (sun gear), outer ring gear, and several planet gears.

Planetary Pinions

Small gears that rotate around a central gear in an automatic transmission or differential, allowing for various gear ratios.

Planetary Members

Components of a planetary gear system, including the sun gear, planet gears, and the ring gear, used to distribute torque and speed in transmissions.