A Weak Acid Has K_a = 4

question 88

Multiple Choice

A weak acid has K_a = 4.2 × 10^-3.If [A^-] = 2.0 M,what must [HA] be so that [H⁺] = 2.1 × 10^-3 M?

• A)1.5 M
• B)2.0 M
• C)1.0 M
• D)0.5 M
• E)0.25 M

---

Definitions:

Long-run Cost Function

A relationship that shows the lowest possible cost at which a firm can produce any given level of output when all inputs, including capital, are variable.

Cost-output Elasticity

A measure of how responsive the cost of production is to a change in the output level.

Marginal Cost

The added expense incurred upon producing one further unit of a good or service.

Average Cost

The total cost of production divided by the quantity of output produced, indicating the cost per unit of output.