A Homeowner in Boston Becomes Concerned That There May Be

question 43

Multiple Choice

A homeowner in Boston becomes concerned that there may be appreciable amounts of lead in her drinking water due to 150-year old water pipes in her house. Consequently, she takes a sample of her drinking water in to be analyzed. The laboratory technician, who is new on the job, has been told to analyze by precipitating the lead ion as the iodide (Ksp = 7.1 × 10^-9 for PbI2) by slowly adding small portions of 1.00 M NaI solution. If we assume that the concentration of lead in the solution is 1.00 mg/liter or approximately 4.8 × 10-6 M (this would be 1.0 part per million) is it possible to detect the lead in the drinking water by adding a total of no more than 10.0 mL of NaI solution to a 100 mL sample of drinking water? You must of course consider dilution effects. What is Q?

• A) yes, Q = 4.0 × 10^-7
• B) yes, Q = 3.6 × 10^-8
• C) no, Q = 1.6 × 10^-13
• D) no, Q = 3.6 × 10^-8
• E) no, Q = 4.0 × 10^-7

Appreciate Adam Smith’s contribution to understanding the significance of specialization and economies of scale in economic theory.

Grasp the concept of diminishing marginal productivity and its impact on cost functions.

Understand how to calculate average fixed cost, average variable cost, and average total cost from given production and cost data.

Recognize and explain the marginal product of labor.

---

Definitions:

Lexically Ambiguous

A term used to describe a situation where a word or phrase has more than one meaning, leading to potential confusion in understanding.

Speech Perception

The process by which the human brain interprets spoken language, involving the decoding of phonetic sounds into meaningful units.

Acoustic Properties

Characteristics of sound or sound waves, including aspects like pitch, volume, and timbre, relevant in fields like physics and music.

Phonetic Ambiguity

A situation in which a spoken word can be interpreted as having multiple meanings due to similarities in sound patterns.