Praxis 5025 Practice Question
Which of the following substances can be added to water to form a solution?
Correct Answer: C
Rationale: Table salt (C) dissolves in water, forming a homogeneous solution where the salt ions separate and disperse evenly throughout the liquid. This property allows for the creation of saline solutions, which are essential in various applications.
Pencil lead (A), primarily made of graphite, does not dissolve in water; instead, it remains as solid particles. Candle wax (B) is hydrophobic and will float on water, forming a separate layer rather than a solution. Iron filings (D) also do not dissolve; they settle at the bottom and do not integrate into the water, remaining as distinct particles. Thus, only table salt effectively forms a solution with water.
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