A Buffer Solution with a PH of 4

question 52

Multiple Choice

A buffer solution with a pH of 4.40 is prepared with 0.78 M Na C₂H₃O₂ and ________ M HC₂H₃O₂. The K_a of HC₂H₃O₂ is 1.8 × 10^-5.

• A)1.7
• B)3.5
• C)4.1 × 10⁴
• D)0.35
• E)0.86

---

Definitions:

Straightness

A condition where an element or line maintains a consistent path without deviation, typically applied in manufacturing to ensure parts are within specified tolerances.

Flatness

A geometric tolerance that describes how flat a surface must be within specified limits.

Tertiary Plane

A plane that is oriented to intersect or be parallel with the primary and secondary planes in a three-dimensional coordinate system.

Primary Datum

A reference point, line, or plane from which dimensions are measured in technical drawing or CAD modeling.