Calculate the PH of a 0

question 77

Multiple Choice

Calculate the pH of a 0.21 M solution of NaA (K_a for HA is 2.1 × 10^-4) at 25°C.

• A) 11.82
• B) 5.50
• C) 8.50
• D) 3.00
• E) 2.18

---

Definitions:

Weber Fraction

A constant proportion in Weber's Law that describes the smallest change in a stimulus that can be detected as a proportional part of the original stimulus.

Psychological Magnitude

The quantifiable aspect of a psychological factor, such as the intensity of a sensation, emotion, or perception.

Standard Stimulus

A stimulus used as a benchmark in experiments to measure how different stimuli can influence behavior or perception compared to this control stimulus.

Constant

A value or quantity that remains unchanged within a given context or under specified conditions.