400 Ml of an Acetic Acid of Unknown Concentration Is

question 72

Multiple Choice

40.0 ml of an acetic acid of unknown concentration is titrated with 0.100 M NaOH. After 20.0 mL of the base solution has been added, the pH in the titration flask is 5.10. What was the concentration of the original acetic acid solution? [K_a(CH₃COOH) = 1.8 * 10^-5]

• A) 0.11 M
• B) 0.022 M
• C) 0.072 M
• D) 0.050 M
• E) 0.015 M

---

Definitions:

Materials Price Variance

The difference between the actual cost of direct materials purchased and the standard cost, multiplied by the quantity purchased.

Standard Quantity

The predetermined amount of materials or resources expected to be used in a production process or manufacturing of a product.

Standard Price

A predetermined cost that is set for materials, labor, and overhead to evaluate financial performance against actual costs.

Actual Materials Purchased

The actual quantity of materials bought by a company for production purposes over a given period.