An Environmental Chemist Obtained a 200

question 61

Multiple Choice

An environmental chemist obtained a 200. mL sample of lake water believed to be contaminated with a single monoprotic strong acid. Titrating this sample with a 0.0050 M NaOH(aq) required 7.3 mL of the NaOH solution to reach the endpoint. If the size of the lake can be approximated as 1.1 km long by 2.3 km wide, and has an average depth of 10. m, estimate how many moles of the strong acid are present in the lake

• A) 4.0 * 10⁶ moles of acid
• B) 4.2 * 10⁶ moles of acid
• C) 4.4 * 10⁶ moles of acid
• D) 4.6 * 10⁶ moles of acid
• E) None of the above

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Definitions:

Ethical Issue

A situation that requires a person or organization to choose between alternatives that must be evaluated as right (ethical) or wrong (unethical).

Human Subjects

Individuals who participate in research studies, whose rights and welfare are protected by ethical guidelines.

Psychological Damage

Emotional or mental injury caused by experiences of stress, trauma, or abuse that adversely affects an individual’s mental health and well-being.

Construct Validity

The degree to which a test measures what it claims, or purports, to be measuring. It is the degree to which the dependent measure assesses what it intends to assess or the manipulation of the independent variable manipulates what it intends to manipulate.