A Solution Contains 0

question 58

Multiple Choice

A solution contains 0.10 M Ca²⁺ and 0.10 M Mg²⁺.The pH of the solution is raised without changing the volume of the solution.What percentage of Mg²⁺ remains in solution when Ca(OH) ₂(s) first begins to precipitate? (K_sp of Ca(OH) ₂ = 4.0 × 10−⁶ and K_sp of Mg(OH) ₂ = 7.1 × 10−¹²)

• A) 1.8 × 10−⁴ %
• B) 4.0 × 10−⁴ %
• C) 6.3 × 10−³ %
• D) 7.2 × 10−³ %
• E) 1.4 × 10−² %

---

Definitions:

Weak Analogy

An argument based on insufficient parallels between two or more entities, which may lead to faulty conclusions.

Circular Argument

A logical fallacy in which the conclusion is supported by premises that assume the truth of the conclusion instead of providing evidence for it.

Hedonic Adaptation

The observed process of people returning to a set level of happiness despite major positive or negative events or life changes.

Natural Selection

A mechanism of evolution where organisms better adapted to their environment tend to survive and produce more offspring, shaping the genetics of populations.